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Tobii Pro Glasses Analyzer User`s Manual

1. Wearable eye tacking devices such as Tobii Pro Glasses 2 produce eye gaze data mapped to a coordinate system relative to the wearable eye tracker and the recorded video not to static objects of interest in the environment around the participant wear ing the eye tracker For most statistical numerical analysis to be meaningful the collected eye tracking data needs to be mapped onto objects of interest and into a new coordinate system with its origin fixed in the environment around the participant Tobii Pro Glasses Analyzer addresses this challenge by allowing the user to semi automatically map eye gaze data onto still images of environments and objects of interest 1 1 Howto read this manual This User s Manual provides a general overview over the capabilities tools and procedures in the Tobi Pro Glasses Analyzer see section 3 Getting to know Tabir Pro Glasses Analyzer page 4 as well as providing more in depth how to instructions for operating the software see section 4 Basic operations in Tobii Pro Glasses Analyzer page 9 i Keep in mind that eye tracking data is affected by a multitude of factors in all steps of eye tracking research including data collection analysis and interpretation Before processing or analyzing your Glasses 2 data make sure to read this entire User s Manual as well as the Tobi Pro Glasses 2 Eye Tracker User s Manual lett Glossary Project is the top level of the data structure in Tobii Pro Glasses Anal
2. amp jpg Currently available data export fields Project name Participant name Recording name Recording date Recording start time Recording duration Recording timestamp Tobi Pro Glasses Analyzer User s manual v 1 25 en US Appendix E Software Features 43 Gaze point X Gaze point Y Gaze direction left X Gaze direction left Y Gaze direction left Z Gaze direction right X Gaze direction right Y Gaze direction right Z Pupil position left X Pupil position left Y Pupil position left Z Pupil position right X Pupil position right Y Pupil position right Z Pupil diameter left Pupil diameter right Eye movement type Eye movement type index Fixation point X Fixation point Y Event Recording media name Recording media width Recording media height Media width Media height Mapped gaze data X Mapped gaze data Y Mapped eye movement type Mapped eye movement index Mapped fixation point X Mapped fixation point Y AOI hit Gyro X Gyro Y Gyro Z Accelerometer X Accelerometer Y Accelerometer Z 44 Appendix E Software Features Tobi Pro Glasses Analyzer User s manual v 1 25 en US E6 Metrics Export Feature Full Edition Coder Edition AOI based eye trac
3. coders who simultaneously log events and or map the data onto snapshot images After the mapping is complete the data from all coders should be merged into the same project for visualization generation export and analysis 3 1 4 1 Workflow quick guide Several coders map data to be imported into the same project Distributed mapping 1 Open an existing project or create a new project in Tobi Pro Glasses Analyzer See section 4 1 Managing projects in Tobii Pro Glasses Analyzer page 9 2 Import Tobii Pro Glasses 2 data from the SD memory cards used during recording See section 4 2 Importing data from Tobii Pro Glasses 2 page 10 3 Define Custom Event types and import snapshot images See sections 4 3 Replaying recordings and logging events page 11 and 4 4 7 Importing snapshots page 14 4 Prepare and send the files to the coders the persons who will code the data a Zip the project folder and send the project to the coders Make sure to include instructions on how and what to code and which recordings the coders should work on Cod ing needs to be assigned by either Recordings or Snapshots multiple coders must not be allowed to work on the same recording snapshot combination in parallel Coders Unzip the received files Coders Open the project in Tobii Pro Glasses Analyzer See section 4 1 2 Opening an existing project page 9 7 Coders Open the replay tabs for recordings the coder is assigned to process See sect
4. 4 5 2 Editing the shape of an existing AOI To change the shape of an existing AOI 1 Make sure the AOI you want to edit is visible if not read section 4 5 8 Showing Hiding AOls page 18 2 On the toolbar select the Select Move Vertices tool 3 Drag the vertices to transform the AOI There is no way to add or delete vertices on an existing AOI at present 4 5 3 Changing the size of an existing AOI To change the size of an existing AOI 1 Make sure the AOI you want to resize is visible if not read section 4 5 8 Showing Hiding AOls page 18 2 On the toolbar select the Select Move AOI tool 3 Click the AOI that you want to resize A rectangle with sizing handles in the corners appears around the selected AOI 16 4 Basic operations in Tobii Pro Glasses Analyzer Tobii Pro Glasses Analyzer User s manual v 1 25 en US 4 To increase or decrease the size click and drag one of the sizing handles To maintain the object s proportions press and hold SHIFT while you drag the sizing handle The size of a selected AOI can also be adjusted by modifying the width W and height H values in the property fields on the toolbar 4 5 4 Moving an existing AOI To move an existing AOI Make sure the AOI you want to move is visible if not read section 4 5 8 Showing Hiding AOls page 18 On the toolbar select the Select Move AOI tool Click the AOI that you want to move A rectangle appears around the selected AOI AOO N gt
5. Glasses coordinate system with origin at the center of the scene camera The Z axis goes straight out from the scene camera the X axis to the left from the participant and the Y axis straight up i The Glasses 2 uses the intersection of the gaze vectors from the two eyes to calculate the distance at which the participant is looking at If the eye tracker loses tracking of one of the eyes it will continue using the last known distance until it gets gaze data from both eyes again Appendix A Coordinate systems and mapping of data onto snapshots 30 Tobii Pro Glasses Analyzer User s manual v 1 25 en US Appendix B Fixation Filters how they work and what effects they have B1 Raw gaze filter The Raw setting is the default setting activated in Tobii Pro Glasses Analyzer It does not classify the gaze data into fixations saccades or any other eye movement The Raw data filter instead offers the possibility to apply three data processing functions Gap fill in interpolation Eye selection and Noise reduction to the data Tobii Pro Glasses Analyzer includes one preset for the raw filter The default parameters for this filter is defined below If you wish to modify the filter settings for you project choose the option Create new Raw filter from the Gaze Filter drop down menu and change the appropriate variables Your custom filter settings will be saved as a new filter available in all parts of the software B1 1 Raw gaze filt
6. YES TSAURIN EEE ES 43 E2 MAD DIN TTT 43 E3 VISUAIIZATIONS soiien a canes seas sanen EE RAN AR EE ARA RNR AAEE RERA EEEE 43 E4 Areas of Interest AQIS T 43 E5 Data EXPO t keinona asaini onanii ade iaiia diaa aidin iTi a a Eana 43 E6 Metrics EXP Often a aa NEEE E A E GAEE EO AEG 45 Append F Sotware System Regule meme erciiinesiei i aisiiisaiiieii niaii 46 F1 Minimum System Requirement sse ees sese ee eee eee eee eee ereer eee 46 F2 Recommended System Configuration sss sees ee eee ee ee eee 46 Appendix G Snapshot Considerations When Using Real World Mapping sss sees sees eee eee 47 1 Introduction Tobii Pro Glasses Analyzer is a dedicated software tool used for processing analyzing and exporting eye tracking data and vid eos made with the Tobii Pro Glasses 2 Eye Tracker The software imports the recorded data and videos from the SD memory card used in a Tobii Pro Glasses 2 recording and enables the user to work with the data in a number of ways such as replaying event logging data mapping data visualizations and data and metrics exporting Tobii Pro Glasses Analyzer is designed to also prepare and process Tobii Pro Glasses 2 data to enable further more in depth analysis in various software including SPSS Matlab or Excel and to provide tools to create eye tracking visualizations such as heat maps Tobii Pro Glasses Analyzer also supports qualitative analysis of recorded videos and data through replay functionality and event logging tools
7. and change the appropriate variables Your custom filter settings will be saved as a new filter available in all parts of the software B2 9 1 Tobii I VT old and Tobii l VT Fixation old These are the fixation filters included in versions prior to 1 16 of Tobii Pro Glasses Analyzer This filter is still available in existing projects created in versions 1 16 or earlier of Tobii Pro Glasses Analyzer the preset is not available for Projects created in 1 17 or later To calculate the gaze velocity for data mapped to snapshots this filter uses a virtual point in front of the snapshot as the origin The Tobi I VT old and Tobii I VT Fixation old filters have the following default settings Gap fill in interpolation Default Enabled Max gap length 75 ms Eye selection Default Average Noise reduction parameters for filter Tobii I VT old Default Disabled Noise reduction parameters for filter Tobii I VT Fixation Old Default Moving Median Appendix B Fixation Filters how they work and what effects they have 34 Tobii Pro Glasses Analyzer User s manual v 1 25 en US Window size 3 samples Velocity calculator Default window length 20 ms VT fixation classifier Default Threshold 30 degrees second Merge adjacent fixations Default Enabled Max time between fixations 75 ms Max angle between fixations 0 5 degrees Discard short fixations Defau
8. been mapped onto the snapshot the data export output file will in clude data about which gaze points are located inside the defined AOls A selection of eye tracking metrics calculated based on the AOls and the gaze data are also available for export For more information about AOls see section 4 5 Creating and managing Areas of Interest AOls page 16 3 1 3 1 Workflow quick guide Creating statistics 1 Open an existing project or create a new project in Tobi Pro Glasses Analyzer See section 4 1 Managing projects in Tobii Pro Glasses Analyzer page 9 2 Import Tobii Pro Glasses 2 data from the SD memory cards used during recording See section 4 2 Importing data from Tobii Pro Glasses 2 page 10 Import snapshot images See section 4 4 1 Importing snapshots page 14 For each recording map relevant data onto the snapshot images See section 4 4 2 Mapping data onto a snapshot page 14 Create AOls on the snapshot images See section 4 5 Creating and managing Areas of Interest AOls page 16 Export the data and metrics for further analysis outside Tobii Pro Glasses Analyzer See section 4 8 Exporting Tobii Pro Glasses 2 data for further analysis page 22 3 1 4 Scenario Several coders map data to be merged into the same project at a later stage Distributed mapping In studies where there are a large number of recordings or a large number of snapshots to map data onto it can be beneficial to involve several people
9. box will appear to the right of the fill color drop down menu click on this to choose the fill color of the gaze points Show gaze order Toggles gaze order numbers in gaze plots Show gaze trail Toggles gaze trail Opacity Gaze plot transparency ln the Tools panel on the right in the gaze plot settings tool click and drag the Opacity slider handle to adjust the opac ity of the gaze plot background color 4 6 6 Saving a gaze plot as an image Gaze plots can be saved as image files to be incorporated later into reports Available image file formats are png and jpg To save a gaze plot 1 Right click within the gaze plot area A context menu appears with the option to Save to File In the Context menu select Save to File A Windows File Manager dialog box opens In the file manager dialog box locate the folder you want to save the file in In the File name field enter a file name for your gaze plot a fF oN In the Save as Type dropdown menu select desired file type png or jpg For heat maps with transparent back grounds the file type must be png to maintain the transparency 6 Click Save to save the gaze plot 4 7 Exporting a Video Clip Video clips including gaze overlay can be exported from Tobii Pro Glasses Analyzer using the timeline within the replay tab To export a video clip with gaze overlay Tobi Pro Glasses Analyzer User s manual v 1 25 en US 4 Basic operations in Tobii Pro G
10. filter result Fixation Fixation gt Fixation filter result fixation B4 The effects of mapping data onto snapshot with Tobii I VT or Raw fixation filter When mapping data onto a snapshot with the I VT fixation filter turned on the replay window will only display data points that were Classified as fixation data Taking the previous section into consideration the conclusion is that the replay will only display fixations if both the participant s head and the object being research was still or special case The participant s head and the eye tracker glasses follow along with a moving object To be sure to map all available data in all circumstances make sure you use Raw fixation filter when mapping data onto snapshots The Tobi I VT Attention filter preset is suitable for situations where you only want to study attention without separating any eye movements This preset has the I VT fixation classifier set to 100 degrees second and will thus in addition to classifying typical fixations also classify most VOR vestibulo ocular reflex smooth pursuit eye movements and slow saccades as fixations Appendix B Fixation Filters how they work and what effects they 37 Tobi Pro Glasses Analyzer User s manual v 1 25 en US have Always make sure to double check mapped data by replaying the recording with the snapshot showing mapped data and the fixation filter set to Raw Appendix B Fixation Filters how they work and what effe
11. import Glasses Data from another project 1 a fF ON First open the project into which you want to merge the imported project In the Dashboard menu select Import gt Glasses Recording The file manager will open In the Windows File Manager locate the project ttgp that you would like to import Select the appropriate Project and click Open A project Import dialog box opens In the Glasses Data Import dialog box select the applicable recordings you wish to import into your open project To import the selected Glasses Data click import To import Snapshots from another project 1 2 3 4 First open the project into which you want to merge the imported project In the Dashboard menu select Import gt Snapshots The file manager opens In the Windows File Manager locate the Snapshots that you would like to import Select the applicable Snapshots and click Open The Snapshots will now be imported into the project If the same Snapshot already exists within the project the Snapshot will not import and a notification will appear with this information To import Coding Data from another project 1 oa fF ON 4 1 4 First open the project into which you want to merge the imported project In the Dashboard menu select Import gt Coding Data A Coding data import dialog box will appear In the Coding data import dialog box click Select file to import The file manager opens In the Windows File Manager loca
12. in an intui tive way Heat maps are created on top of snapshots A heat map uses different colors to illustrate the number of fixations partic ipants made within certain areas of the snapshot or for how long they fixated within that area Red usually indicates the highest number of fixations or the longest time and green the least with varying levels in between For more detailed information about heat maps read section C7 How are heat maps calculated page 39 Gaze plots can be used to illustrate the gaze pattern of a single test participant throughout the entire eye tracking session or of several participants in a short time interval i The Raw filter is the default setting when creating visualizations however if the Tobii I VT filter was used when map ping data onto snapshots the I VT filter will still be applied when a visualization is generated regardless of which filter is selected in the visualizations tab 18 4 Basic operations in Tobii Pro Glasses Analyzer Tobii Pro Glasses Analyzer User s manual v 1 25 en US 4 6 1 Creating heat maps To be able to create heat maps on snapshots at least one snapshot in the project has to have gaze data mapped onto it To create a heat map 1 Select Visualizations in the Dashboard Menu A Visualizations tab opens 2 Inthe Visualization Type and Settings tool select heat map 3 Inthe Tools panel on the right in the Analysis Sets tool select the snapshot Analysis Set that you want
13. the eye tracker sampled every 3 3 to 33 ms depending on the sampling data rate of the eyetracker Duration values for each entry are constant as they are defined by the duration of the sampling interval When the input is based on fixation data the eye tracker will group the raw data entries into fixations and the duration of each fixation depends on the fixation filter used to identify the fixations The input data will typically look like this Fixation 1 Start 182 ms Duration 132 ms Location 415 711 Fixation 2 Start 264 ms Duration 735 ms Location 711 491 Fixation 3 Start 999 ms Duration 101 ms Location 301 10 G11 Basic concept The first step in creating a heat map is to map the fixation on the stimuli This is done by going through all the fixations in all selected recordings one by one and adding their values whenever a fixation shares the same X and Y pixel location as another see figures below If we chose Count we add the number of fixations at the same location If we use Absolute duration we add the duration of each fixation For Relative duration the duration of each fixation is divided first by the media viewing time and then added Heatmap Count Heatmap Count image image x y pixels 5 7 x y pixels Once all the fixation values have been added together color values are added to all the points with the warmest color representing the hig
14. to use as the base of your visualization 4 Inthe Tools panel on the right in the Data Selection tool select deselect the recordings and or intervals that you want to visualize in the heat map To see the intervals included click the arrows to the left of the recording checkboxes to ex pand the view An interval is a subset of mapped data associated to a specific recording These subsets are generated automatically when there is a gap of data for at least 5 seconds in the mapped data 5 Inthe Tools panel in the heat map settings tool in the Type dropdown menu select the calculation basis for the heat map for more information about heat maps read section C1 How are heat maps calculated page 39 Absolute count calculated by the number of fixations or gaze data samples if using raw data Absolute duration calculated by the duration of fixations or gaze data samples if using raw data Relative count calculated by the number of fixations relative to the total number of fixations made by the partici pants in the Analysis set or gaze data samples instead of fixations if using raw data Relative duration calculated by the duration of the fixations relative to the sum of all fixation durations mapped in the Analysis set on the snapshot or gaze data samples instead of fixations if using raw data 6 The heat maps is now drawn on top of the snapshot image 4 6 2 Customizing the appearance of a heat map The a
15. Drag the AOI to its new location To constrain an AOI so that it moves only horizontally or vertically press and hold SHIFT while you drag the object The position of a selected AOI can also be adjusted by modifying the X and Y values in the property fields on the toolbar 4 5 5 Changing the name or appearance of an AOI To change the name of an AOI ln the list of AOls double click the previous AOI name and then enter the new name ln the AOI shape double click the name label and then enter the AOI s new name When an AOL is selected press F2 on your keyboard to open the Rename AOI dialog box To change the appearance of an AOI To change the color of an AOI click the AOI color indicator rectangle next to the AOI name in the Areas of Interest list Pick a new color and click OK To change the opacity of the AOls adjust the AOI s Opacity slider in the View Options in the tools panel on the right To show or hide the AOI name labels in the AOls tick or untick Show AOI Names in the View Options in the tools panel on the right To show or hide the AOI fill colors tick or untick Show Fill Color in the View Options in the tools panel on the right 4 5 6 Undoing redoing AOI actions To undo the most recent action Click the Undo button on the toolbar or press Ctrl Z To undo a number of recent actions 1 On the toolbar click the dropdown arrow next the Undo button 2 Select the actions you want to undo in the dropdo
16. Number starting with 1 for each EyeMovementType Fixation data Fixation Point X Horizontal coordinate of the averaged Pixels gaze point for both eyes Fixation Point Y Vertical coordinate of the averaged gaze Pixels point for both eyes Snapshot data Event Name of automatically or manually logged event Recording Media Name Name of the Recording Media Recording Media Width Width of the Recording Media Pixels Recording Media Height Height of the Recording Media Pixels Media Width Width of Media Enabling this column Pixels generates one column per Snapshot Media Height Height of Media Enabling this column Pixels Width Snapshot Name Width of a snapshot in pixels Number of pixels Height Snapshot Name Height of a snapshot in pixels Number of pixels Snapshot Name mapped to a snapshot Mapped Gaze Data X Horizontal coordinate of the gaze point Pixels Snapshot Name mapped to a snapshot Mapped Gaze Data Y Vertical coordinate of the gaze point Pixels Mapped Eye Movement Type Snapshot Name Type of eye movement classified by the default fixation filter Fixation Saccade Eye NotFound Movement shot Name to a snapshot Column is empty if the EyeMovement Type is other than Fixation Column is not affected by settings in the Fixation Filter Default fixation filter is applied UnknownEyeMovement Mapped Eye Movement An auto increment number starting with Number In
17. Tobi Pro Glasses Analyzer User s Manual Version 1 25 tobil pro Users manual Tobi Pro Glasses Analyzer Version 1 25 11 2015 All rights reserved Copyright Tobii AB publ The information contained in this document is proprietary to Tobii AB Any reproduction in part or whole without prior written authorization by Tobii AB is prohibited Products that are referred to in this document may be either trademarks and or registered trademarks of the respective owners The publisher and the author make no claim to these trademarks While every precaution has been taken in the preparation of this document the publisher and the author assume no responsibility for errors or omissions or for damages resulting from the use of information contained in this document or from the use of programs and source code that may accompany it In no event shall the publisher and the author be liable for any loss of profit or any other commercial damage caused or alleged to have been caused directly or indirectly by this document Content subject to change without notice Please check Tobii web site www tobiipro com for updated versions of this document Table of Contents 1 atge cT AA EE A E A A EN E T T A AE T EE 1 1 1 How to read this Mantial ccsccie cocciatsacdenandsardetaessnadencetssscesaasaadeeragied secede uadsne SENES Snia 25 2555259 v 4585 1 1 1 1 GIOSSANY E a E E T 1 Installing and Updating Tobii Pro Glasses Analy Fer T 2 2 1 Obt
18. aining the Tobi Pro Glasses Analyzer installer sse ee ee eee 2 2 2 Installing Tobi Pro Glasses Analyzer eee ee eee ee eee 2 2 3 Updating Tobii Pro Glasses Analyzer sys vsaasssssss z assss vsz ssa gsss2 s eres ra aaa EAREN TT A3 RR OA 2 2 4 Deactivating Tobi Pro Glasses Analyzer sese eee eee eee eee 2 G tngto know Tobi Pro Glasses FINA ZEF csi seceocstsanscnerssaccoexinnesimscianessscanaanemnnncnrenssasimensasiontiend 4 3 1 Work flow guide Usage SCenarioS ss ta225 5220729215202492 X ST T22 59270729 ee 9246 T 2573295 v22 0734395034 17999vr 5515 4 3 1 1 Scenario Qualitative research based on replaying recordings sees eee ee ee eee ee 4 3 1 2 Scenario Creating visualizations heat maps eee eee eee eee 4 3 1 3 Scenario Creating and exporting eye tracking metrics and data eee 5 3 1 4 Scenario Several coders map data to be merged into the same project at a later stage Distributed mapping eee eee eee eee 5 3 1 5 Scenario Several data Collection locations cc ee eee eee 6 3 1 6 Scenario Getting raw data from Tobi Pro Glasses 2 recordings sese eee eee 6 3 2 Overview Tobii Pro Glasses Analyzer User Interface 0 eee eee 6 3 2 1 Applicatlon MON iresi anarei a a nader anii anii iaaiiai 6 3 2 2 Project R U S P 7 3 3 Data and media structure in the SoftWare sse sees eee eee eee 8 3 3 1 Data Sets and Analysis TT 8 Basic operations in Tobi Pro Glasses Ane eiisiaracedaiindiieiunia minal aa pA 9 4 1 Managing projects
19. and pasting AOS sssri ys assa a2 as sss razan sz 52 ee ee h NEEE aA 17 4 5 8 SHOWING AIGING AOI Ses ce ssstestesscndsvasestedecuessstedanes dees scesnavessagsadesdqesttdeadsaasadessansusce eae 18 4 5 9 Panning and zooming in the AOI editor sse eee eee ee eee eee 18 4 5 10 Exporting an image of the AOls on the snapshot eee eee ee ee ee eee 18 4 6 Visualizing eye tracking Catas cic scscsessaaensesssanerccaassastseassbensieaessansdaaessan suas AZER TE RST 18 4 6 1 Creating Neat T 19 4 6 2 Customizing the appearance of a heat Map see ee ee ee ee eee ee ee eee 19 4 6 3 Saving a heat Map as an IMAGE cesse sese eee eee eee ereer e eee eee ereer 20 4 6 4 Creating gaze plots TTT 20 4 6 5 Gustomizing Gaze PlOts TTT 20 4 6 6 Saving a gaze plot as an Image eee 21 4 7 Exponinga Video HD Sala Rata A N 21 4 8 Exporting Tobi Pro Glasses 2 data for further analysis sse ee ee ee eee eee eee 22 4 8 1 Exporting NGT zas gos5 222929 ra A E EAEE EAA EEA TERA 23 4 8 2 Exporting Dala scriere arana ERRA RRRA EAEE KERERE 25 Appendix A Coordinate systems and mapping of data onto snapshots sese eee eee eree eee eee 29 A1 Gaze data coordinate SystemS sese esse essere eee ereenn enne 29 A1 1 Gaze Direction Coordinate system sese esse sese e eee eee eee eee ereer 30 Appendix B Fixation Filters how they work and what effects they have ss svvaosssssvesssreresvss sss veso toer 31 B1 Raw gaze filter enasini arean RE E E AAAA EEEE 31 B1 1 Raw gaze filter default
20. as Excel SPSS or Matlab for further processing To generate and export eye tracking metrics or raw data you typically need to first create Areas of Interests AOI around ob jects of interest in your snapshot images Once AOls have been created and gaze data has been mapped onto the snapshot the Data Export output file will include data about which gaze points are located inside the defined AOls All metrics available in Metrics Export are calculated based on AOls and require both AOls and snapshots with mapped gaze data For more informa tion about AOls see section 4 5 Creating and managing Areas of Interest AOls page 16 22 4 Basic operations in Tobii Pro Glasses Analyzer Tobi Pro Glasses Analyzer User s manual v 1 25 en US i The software does not currently provide any tools for presenting or analyzing eye tracking metrics or data this has to be done in third party data processing and analysis software such as SPSS Matlab Excel or similar 4 8 1 Exporting Metrics Metrics are common eye tracking related metrics such as Time to First Fixation that are calculated automatically and exported by the software To generate and export eye tracking metrics you need to first create Areas of Interests AOls around objects of interest in your snapshot images All available metrics are calculated based on AOls and snapshots e g Fixation Count on AOI A on Snapshot X will be calculated as the total number of fixations located inside AOI A Onc
21. ay have the same timestamp as eye gaze data points and others may have time stamps between two eye gaze data point timestamps See below for details Since gaze data points and events have their own rows in the export file the relationship between the number of rows and time is not linear Instead time stamps must be utilized when plotting charting eye gaze data from a data export file Event timestamps and the event s relative position in relationship to the gaze data rows RecordingStart Timestamp 0 same timestamp as the first gaze data point Row order Event Gaze data RecordingStop The same timestamp as the last gaze data point Row order Event Gaze data IntervalStart Timestamp between two gaze data point timestamps IntervalEnd Timestamp between two gaze data point timestamps Custom events Manually added by the user The same timestamp as the gaze data sample that was visible in the replay window when logging of the event was made Row order Event Gaze data 4 8 2 2 Data export data types The following table describes information types and data types in the export output file from Tobii Pro Glasses Analyzer Each type has its own column in the data export output file General data Description Format Project Name Name of the Tobii Pro Glasses Analyzer project Participant Name Name of the participant associated with the recording Recording Na
22. aze point by gaze point Gaze data from a recording can be mapped on one or several snapshots i The Raw filter is the default setting when creating visualizations however if the Tobii I VT filter was used when map ping data onto snapshots the I VT filter will still be applied when a visualization is generated regardless of which filter is selected in the visualizations tab 4 4 1 Importing snapshots Snapshots are still images of environments areas or objects of interest relevant for the study Snapshots are typically created by the data collector or researcher by using a standard digital camera Requirements for snapshot images Less than 25 megapixels PNG or JPG file format Snapshots created from multiple images that are stitched together into one image are allowed as long as the final snapshot file matches the snapshot requirements above Stitched images are images that are put together from a series of images covering a greater area than the camera was capable of covering in just one shot Snapshots still images can be imported either from the Dashboard menu or from the Tools panel within a replay tab i Snapshots created from multiple images does not work flawlessly with Real World Mapping at the moment Also see Appendix G Snapshot Considerations When Using Real World Mapping To import a snapshot from the Dashboard Menu 1 Inthe Dashboard Menu click Import gt Snapshots the import dialog will open 2 Locate t
23. be correct As long as the images from the participants recording are made from more or less the same position we have no problems But what if the participant stands a few meters to the right so the can of pens is shadowed by the cash register in effect the can will no longer be visible from that point in the recording and Real World Mapping will not be able to map the data correctly Appendix G Snapshot Considerations When Using Real World 47 Tobii Pro Glasses Analyzer User s manual v 1 25 en US Mapping tobil Dro Tobii Illustrations and specifications do not necessarily apply to products and services offered in each local market Technical specifications are subject to change without prior notice All other trademarks are the property of their respective owners Tobii Pro Support EUROPE GLOBAL NORTH AMERICA JAPAN CHINA Phone SWE 46 8 522 950 10 Phone 1 703 738 1320 Phone 81 3 5793 3316 Phone 86 180 1558 5168 Phone GER 49 69 24 75 03 4 27 support tobii com support us tobii com support jp tobii com support cn tobii com Support hours 8 am 6 pm Support hours 8 am 8 pm Support hours 9 am 5 30 pm Between July August 9am 5pm US Eastern Standard Time GMT 6 Japan Standard Time GMT 9 Central European Time GMT 1 SN ue Go p a jenuew sasn sezAjeuy Sesser oid GO
24. ch a few samples are missing as being interpreted as two separate fixations Such loss of gaze data can occur due to temporary interference of eye lashes or other factors In these cases the data loss is usually limited to a short period of time typically less than 50 ms Data can also be lost due to other reasons such as the participant blinking or looking away These kinds of data losses usually result in data gaps longer than 100 ms Losing data in these latter cases may be perfectly fine for applications of eye tracking where visual attention is measured since participants do not see anything while blinking or looking away anyway The Tobii Pro Glasses Analyzer user can control the limit of how large the gaps in ms in gaze data are that should be filled in by setting the parameter Max gap length Data is filled in in the data gap through linear interpolation Data points are added along a straight line between neighboring valid data points Interpolation is done for each eye separately For additional information about the fixation filters please read the following Tobii Pro whitepapers that can be found i on Tobii Pro website Tobii l VT Fixation Filter Algorithm Description Determining the Tobii l VT Fixation Filter s Default Values B2 2 Eye selection The eye selection function enables you to choose to discard the gaze data collected from one of the eyes left or right or to average the data from both eyes for fixation c
25. cts they have 38 Tobi Pro Glasses Analyzer User s manual v 1 25 en US Appendix C How heat maps are calculated C1 How are heat maps calculated The heat map can be based on either fixation data or raw data depending on whether you are using one of the fixation filters or the raw data filter In both cases data entries consist of a timestamp duration and spatial location X and Y coordinates There are four different settings for heat maps in Tobii Pro Glasses Analyzer Absolute count calculated by the number of fixations or gaze data samples if using raw data Absolute duration calculated by the duration of fixations or gaze data samples if using raw data Relative count calculated by the number of fixations relative to the total number of fixations made by the participants in the Analysis set or gaze data samples instead of fixations if using raw data Relative duration calculated by the duration of the fixations relative to the sum of all fixation durations mapped in the Analysis set on the snapshot or gaze data samples instead of fixations if using raw data Eye tracking raw data is composed of fixation and noise data points The noise includes eye samples during saccades and other small fixation related movements A heat map based on raw data will therefore contain more noise and show larger areas with the high color value When a heat map is based on raw data each entry corresponds to a raw gaze point from
26. d kept still Smooth pursuit gt Fixation filter result Saccade or UnknownEyeMovement Fixation gt Fixation filter result fixation Tobii I VT Fixation filter results Applying the fixation filter on data mapped to a snapshot image of the environment where the researched object of interest is located The person is looking at the object of interest Scene camera video Object of interest Snapshot Movement direction Object of interest is moving Object of interest is still Head moving Combination of Vestibulo ocular reflex and smooth pursuit gt Fixation filter result Saccade or UnknownEyeMovement Vestibulo ocular reflex gt Fixation filter result fixation Head kept still Smooth pursuit gt Fixation filter result Saccade or UnknownEyeMovement Fixation gt Fixation filter result fixation Tobii I VT Fixation filter results Applying the fixation filter on data mapped to a snapshot image showing only the researched object of interest The person is looking at the object of interest Snapshot Scene camera video Object of interest Movement direction Object of interest is moving Object of interest is still Head moving Combination of Vestibulo ocular reflex and smooth pursuit gt Fixation filter result Fixation Vestibulo ocular reflex gt Fixation filter result fixation Head kept still Smooth pursuit gt Fixation
27. d on regions Full recording data set is the entire collection of gaze data for a specific recording Snapshot analysis set is the entire collection of data that has been mapped onto a specific snapshot Custom events are events such as Participant arrives to area A or Participant reaches for item 1 that are manually logged onto the recording time line by the analyst while looking at a replay of a recording Real World Mapping is Tobii Pro s software technology for automatic mapping of gaze data from Glasses 2 onto a snapshot Tobi Pro Glasses Analyzer User s manual v 1 25 en US 1 Introduction 1 2 Installing and Updating Tobi Pro Glasses Analyzer The objective of this chapter is to describe how to install and update Tobii Pro Glasses Analyzer on the Windows computer you are going to use to analyze data collected with the Tobii Pro Glasses 2 Eye Tracker For optimal performance Tobii Pro Glasses Analyzer should be installed on a computer that adheres to the Tobii Pro Glasses Analyzer System Recommendations This document is available at http www tobii com analysissupport or can be obtained from your Tobii sales representative Tobii Pro Glasses Analyzer is compatible with Windows 7 64 bit and Windows 8 8 1 64 bit See Appendix F Software Sys tem Requirements page 46 2 1 Obtaining the Tobii Pro Glasses Analyzer installer The latest installation files and a valid license key for Tobii Pro Glasses Analyzer are de
28. ddition to classifying typical fixations also classify most VOR vestibulo ocular reflex smooth pursuit eye movements and slow saccades as fixations If you use this preset please be aware that all fixation based metrics and visualizations will consist of a mix of eye movements not just fixations To calculate the gaze velocity for data mapped to snapshots this preset uses the Gaze Position 3D coordinates to calculate the true eye velocity Appendix B Fixation Filters how they work and what effects they Tobi Pro Glasses Analyzer User s manual v 1 25 en US have 35 x Gap fill in interpolation Default Disabled Eye selection Default Average Noise reduction Default Moving Median Window size 3 samples Velocity calculator Default window length 20 ms VT fixation classifier Default Threshold 100 degrees second Merge adjacent fixations Default Enabled Max time between fixations 75 ms Max angle between fixations 0 5 degrees Discard short fixations Default Enabled Minimum fixation duration 60 ms B3 Fixation filters when they succeed and when they fail One of the greatest challenges with fixations filters for wearable eye tracking solutions is the fact that the head with the eye tracker typically moves in relationship to the stimuli the object being researched Gaze data produced by the eye tracker is associated to a coordinate system that belongs to the wearabl
29. de Creating visualizations 1 Open an existing project or create a new project in Tobi Pro Glasses Analyzer See section 4 1 Managing projects in Tobii Pro Glasses Analyzer page 9 2 Import Tobii Pro Glasses 2 data from the SD memory cards used during recording See section 4 2 Importing data from Tobii Pro Glasses 2 page 10 Import snapshot images See section 4 4 1 Importing snapshots page 14 For each recording map data relevant data onto the snapshot images See section 4 4 2 Mapping data onto a snap shot page 14 5 Generate the visualizations heat maps See section 4 6 Visualizing eye tracking data page 18 4 3 Getting to know Tobii Pro Glasses Analyzer Tobii Pro Glasses Analyzer User s manual v 1 25 en US 3 1 3 Scenario Creating and exporting eye tracking metrics and data Tobii Pro Glasses Analyzer provides tools that enable you to generate and export eye tracking related metrics and data The software does not currently provide any tools for presenting or analyzing eye tracking metrics or data this has to be done in third party data processing and analysis software such as SPSS Matlab Excel or similar To generate and export metrics and useful data for further analysis you typically need to first create areas of interests AOI around objects of interest in your snapshot images AOls can be of any shape and they are drawn onto a snapshot image in the software Once AOls have been created and gaze data has
30. de an AOI In the Areas of Interest list in the tools panel on the right deselect the check box of the AOI you want to hide To show a hidden AOI In the Areas of Interest list in the tools panel on the right select the check box of the AOI you want to show 4 5 9 Panning and zooming in the AOI editor To pan the snapshot image 1 Select the Move Canvas tool on the toolbar 2 Drag the snapshot image to pan it to a new location To zoom in the snapshot image Select the Zoom tool on the toolbar and click on the snapshot where you want to zoom in On the Zoom bar below the Snapshot slide the Zoom slider to the percentage zoom setting that you want Hold CTRL while scrolling the Mouse Wheel to zoom in or out On the Zoom bar below the Snapshot click the buttons Fit to window or Actual size to switch between the two zoom levels 4 5 10 Exporting an image of the AOls on the snapshot To export an image of the AOls on the snapshot 1 Right click on the snapshot and the context menu opens 2 Click Export Image in the context menu A Save As dialog box opens 3 Inthe Save As dialog box locate an appropriate folder enter a file name and click Save 4 6 Visualizing eye tracking data In the Visualizations tool in Tobii Pro Glasses Analyzer data can be visualized using heat maps and gaze plots Heat maps can be of great value when creating reports papers or presentations as they help you summarize large quantities of data
31. dex Snapshot Name 1 for each MappedEyeMovementType Mapped Fixation X Snap Horizontal coordinate of a fixation Pixels shot Name mapped to a snapshot Column is empty if the EyeMovement Type is other than Fixation Column is not affected by settings in the Fixation Filter Default fixation filter is applied Mapped Fixation Y Snap Vertical coordinate of a fixation mapped Pixels AOI data 1 Fixation filter classified gaze point as a non defined eye movement Neither a fixation nor a Saccade Tobi Pro Glasses Analyzer User s manual v 1 25 en US 4 Basic operations in Tobii Pro Glasses Analyzer 27 AOI hit Snapshot Name Reveals if there is a fixation within a giv 0 1 AOI Name en AOI on a given snapshot 0 No fixation within AOI 1 Fixation within AOI Gyro Rotation along the X Y and Z axis in de grees second Accelerometer Acceleration along X Y and Z axis in meter second 2 28 4 Basic operations in Tobii Pro Glasses Analyzer Tobii Pro Glasses Analyzer User s manual v 1 25 en US Appendix A Coordinate systems and mapping of data onto snapshots Ai Gaze data coordinate systems All gaze data in Tobii Pro Glasses Analyzer relates to a coordinate system The coordinate system for recorded data is based on the scene camera video as seen in the picture below When mapping data onto a snapshot a new coordinate system is automatically created The sna
32. duces output data by calculating the median value of a number of consecutive data points from the input data series The number of input data points used to produce each output data point is controlled by the Window size parameter Each produced output data point is given the timestamp of the input data point that was in the center of the window the median point of the input window the window size parameter must be an odd number In cases where the window is not entirely filled with input data points no output data will be produced This most often happens when the window is short of data points due to the fact that the window stretches outside a data series with valid gaze or small fractions of data points are missing within the window Typically the window stretches outside a valid data series at the beginning and end of a blink or at the beginning and end of a recording Loss of small fractions of data can occur as a result of temporary reflections occlusions etc and can partly be solved by using the Gap fill in function i For additional information about the fixation filters please read the following Tobii Pro whitepapers that can be found on Tobii Pro website Tobii l VT Fixation Filter Algorithm Description Determining the Tobii l VT Fixation Filter s Default Values Appendix B Fixation Filters how they work and what effects they have 32 Tobi Pro Glasses Analyzer User s manual v 1 25 en US B2 4 Noise reduction Mo
33. e AOls have been created and gaze data has been mapped onto the snapshot the metrics can be exported Exports from Metrics Export in Tobii Pro Glasses Analyzer are saved as an Office Open XML compatible spreadsheet xlsx and is compatible with most spreadsheet software such as Microsoft Excel 2007 and later Google Sheets OpenOffice org or similar Each metric is in a separate spreadsheet and with each snapshot or Analysis Set having its own table in the spreadsheet i The calculation of the metrics based on fixations is affected by the fixation filters settings By changing the settings or the type of the fixation filter you change the way a single fixation is defined i e how many individual gaze points a fixa tion will be composed of and as a consequence both count and duration values change To export metrics Select the Metrics tab in the Dashboard Menu A Metrics Export tab opens Select the metrics you want to include in the exported Excel file Click the Export button on the top right A Windows File Manager dialog box opens In the file manager dialog box locate the folder you want to save the file in ao e ON In the File name field enter a file name for your file 6 Click Save to save the export file named xlsx i The Raw filter is the default setting when exporting metrics however if the Tobii l VT filter was used when mapping data onto snapshots the I VT filter will still be applied when exporting metrics
34. e a good mapping as well as a bad one 8 Optional You now have the possibility to complete the analyzed confidence results by manually code correct them If you are satisfied with the results you can skip to step 11 Go to the areas on the time line with low confidence intervals and check whether the gaze points on the snap shot corresponds with the gaze points in the recorded movie Tobi Pro Glasses Analyzer User s manual v 1 25 en US 4 Basic operations in Tobii Pro Glasses Analyzer 15 Eor each point you can now choose to either remove the point by pressing Delete or by right clicking on the point in the image and choose Delete correct the point by manually place it where it should be just like you do in manual mapping described earlier or leave the point as it is The manually coded frames are marked in solid green color without a graph In the snapshot image the automati cally generated mapping is marked with a green circle and the manually coded mapping is marked with a red circle Over ridden automatically mapped points are marked with a grey circle Keep repeating this procedure until you are satisfied 9 View the result in gaze replay We are constantly improving the performance of Real World Mapping The performance depending on the process H ing power processor speed of the computer that is running the automatic mapping hence it is hard to give a definite answer Currently the performance is 2 10 times the l
35. e eye tracker not the stimuli In this eye tracker coordinate system as the participant is moving his her head stimuli will appear to be moving although they are static in the real world To be able to aggregate gaze data in relationship to the stimuli the data needs to be remapped into a coordinate system that is fixed to the stimuli Tobii Pro Glasses Analyzer enables remapping of data by allowing the user to map gaze data onto still images snapshots picturing environments and objects that are being researched The tables below gives a rough indication on how the Tobii I VT fixation filter reacts to gaze data when a participant is looking at an object in different circumstances Green Fixation filter classifies data correctly No color Fixation filter fails to classify the data correctly Tobii I VT Fixation filter results Applying the fixation filter on recorded data no mapping onto snapshot The person is looking at the object of interest Scene camera video Mov ment direction Object of interest Appendix B Fixation Filters how they work and what effects they have 36 Tobi Pro Glasses Analyzer User s manual v 1 25 en US Object of interest is moving Object of interest is still Head moving Combination of Vestibulo ocular reflex and smooth pursuit gt Fixation filter result Saccade or UnknownEyeMovement Vestibulo ocular reflex gt Fixation filter result Saccade or UnknownEyeMovement Hea
36. e timeline and in the Events List in the Tools panel on the right To manually log events you must first define a Custom Events scheme that contains the events you want to log and define which keyboard keys you want to use for logging the events i It is not possible to create two events with the same name within a project If events are created with the same name but on different computers and these projects are later merged into the same project the event types will also be merged 12 4 Basic operations in Tobii Pro Glasses Analyzer Tobii Pro Glasses Analyzer User s manual v 1 25 en US To define a Custom Events logging scheme 1 Make sure a Replay tab is active 2 Locate Events in the Tools panel on the right 3 Click the New Event Type button at the top right of the panel The New event dialog box opens 4 Enter the name description of the event in the New Event dialog box 5 Click the drop down menu in the New Event dialog box and select the keyboard key or combination of keys that you would like to use for logging this event 6 Click OK To edit an existing Custom Event Locate Events in the Tools panel on the right Place the mouse cursor over the custom event you want to edit icons appear on the right Click the edit icon An Edit Custom Event dialog box opens Edit the name or description in the Custom Event dialog box a fF ON Click the drop down menu in the New Event dialog box and select the keyboard k
37. ed in the environment around the participant Tobii Pro Glasses Analyzer addresses this challenge by allowing the user to map eye gaze data onto still images snapshots of envi ronments and objects of interest in two different ways either semi automatically or fully automatically with the new Real World Mapping function Real World Mapping is Tobii Pro s software technology for automatic mapping of gaze data from Glasses 2 onto a snapshot such as a supermarket shelf In Tobii Pro Glasses Analyzer users will use the feature Automatic gaze mapping to map gaze onto a snapshot by using Tobii Pro s advanced algorithms With the result the user can complete or override with manual coding and aggregate data from multiple participants The snapshots images are typically created by the data collector or the researcher by using a standard digital camera see Appendix G Snapshot Considerations When Using Real World Mapping Tobi Pro Glasses Analyzer User s manual v 1 25 en US 4 Basic operations in Tobii Pro Glasses Analyzer 13 To make the manual mapping process efficient Tobi Pro Glasses Analyzer lets you map entire fixations on a snapshot with just one click rather than mapping each data point individually To learn how this affects the data see section B4 The effects of mapping data onto snapshot with Tobii I VT or Raw fixation filter page 37 If you have chosen to map data when the Raw Data fixation filter option enabled the data will be mapped g
38. elect the picture you want to use as reference the snapshot Real World Mapping compares the snapshot with the picture frames in the recording from Pro Glasses 2 For this procedure to work as best as possible it is important that the scene in the snapshot is as flat as possible With flat we mean that the scene should be as two dimensional as possible in the sense that all objects in the images should be more or less on the same distance from the your viewpoint and always visible no matter your viewing angle Imagine a grocery store shelf with lines of cans and cereal boxes all items on the shelf will be visible even if you move a few meters to the left or to the right from your original position only a bit skewed but this is no problem as Real World Mapping can interpret the image anyway There is no risk of an item shadowing another item and this makes for a good reference snapshot as we never know where the participant will stand in front of the store shelf As opposite we can describe a scenery which is much more three dimensional imagine a store desk with a cash register on it To the left of the cash register and a little more to the back on the shelf there is a can with pens If we stand right in front of the desk we see both the cash register and the can the scene looks two dimensional from this point of view and a photograph snapshot of this scene would make both items fully visible and the snapshot image would in fact
39. en the timestamp of the input data point that was in the center of the window the input median point the window size parameter must be an odd number The window size is dynamically adjusted so that the window never stretches outside the valid data series B2 5 Velocity calculator The Velocity calculator function assigns an angular velocity visual degrees second to each gaze data point Angular velocity refers to the angular velocity of the eyes relative to the stimuli To calculate the gaze velocity for data mapped to snapshots the I VT filter uses a virtual point in front of the snapshot as the origin in Tobii Pro Glasses Analyzer version 1 16 and earlier and in version 1 17 and later it uses the Gaze Position 3D coordinates from the Tobi Glasses 2 The Velocity calculator function estimates the eyes angular velocity for each data point by dividing the angular difference between a preceding and a subsequent data point with the time interval between them The time interval is set by the parameter window length in the Velocity calculator function The Velocity Calculator will only produce velocity output data if the entire window contains input data This means that gaps in the input data like the ones caused by blinks will result in larger gaps in the output data The size of the output gap will be equal to the input gap plus the number of data points included by the window length parameter i For additional information about the fixation f
40. ength of the recordings being mapped 4 5 Creating and managing Areas of Interest AOls Areas of Interest AOls enable numerical statistical analysis based on regions or objects of interest in your snapshot images AOls are drawn around objects in your snapshot that you would like to analyze further in third party software such as SPSS Matlab or Excel AOls can be of any shape Once an AOI has been drawn onto a snapshot and there is data mapped onto the snapshot the data export output file will include data on whether the participant s gaze point is inside or outside the AOI 4 5 1 Drawing AOls on Snapshots To draw AOls on a Snapshot 1 Select AOI editor in the main menu and an AOI editor tab will open You can have multiple AOI editor tabs open simulta neously one for each snapshot 2 To draw an AOI do one of the following To draw polygons Select the Polygon tool and click where you want the AOI to start and then click wherever you want to add vertices Close the shape by clicking on the first vertex To draw rectangles or ellipses Select the Draw rectangle or Draw ellipse tool on the top click and drag until the shape is the size you want To make the shape a perfect square or circle press and hold SHIFT while you drag to draw To name an AOI do one of the following Inthe list of AOls double click the previous AOI name and enter the new name In the AOI shape double click the name label and enter the new name
41. er default parameters Gap fill in interpolation Default Off Eye selection Default Average Noise reduction Default Off B2 Tobi I VT Fixation Filter definition The general idea behind an I VT filter Velocity Threshold identification fixation filter is to classify eye movements based on the velocity of the directional shifts of the eye The velocity is most commonly given in visual degrees per second s If the velocity of the eye movement is below a certain threshold the samples are classified as part of a fixation and if the velocity is above the threshold is classified as a saccade The Tobii I VT filter has been developed to work best in stationary situations and the default values of the I VT fixation filter parameters have been set to provide accurate fixation classifications for the most common eye tracking use cases in stationary situations However depending on the type of eye tracking study conducted the settings in the I VT filter can be adjusted to better suit a particular study to get finer grained fixation data or to compensate for high levels of noise The data processing functions within the I VT fixation filter are described in the sections below Tobii Pro Glasses Analyzer includes several presets for the Tobii I VT filter The default parameters for these filters are defined below If you wish to modify the filter settings for you project choose the option Create new I VT filter from the Gaze F
42. er that will improve performance and or intro duce new functionality When a new version of the Tobii Pro Glasses Analyzer is available the user will be notified with an alert symbol at the top of the user interface if the computer is online Alternatively the latest software may be downloaded from the Tobi Pro support website http www tobii com analysissupport Make sure to regularly check for and update to the latest ver sion of the software To Update Tobii Pro Glasses Analyzer 1 Download the latest version of the software 2 Locate and run the installation file on your computer then follow the instructions on the screen 3 Once the installation is completed start the application 2 4 Deactivating Tobii Pro Glasses Analyzer Tobii Pro Glasses Analyzer License key policy also allows single license keys to be deactivated and reactivated more than once allowing you to install Tobii Studio on multiple computers and then switch between the computers 2 2 Installing and Updating Tobii Pro Glasses Analyzer Tobi Pro Glasses Analyzer User s manual v 1 25 en US To deactivate Tobii Pro Glasses Analyzer 1 Connect the computer to the Internet 2 Start Tobii Pro Glasses Analyzer 3 Tobi Pro Glasses Analyzer will open and show the Applications Menu click on License 4 Click on Deactivate Clicking this button will deactivate your License key and the key will disappear please make sure you know your License key and have it writte
43. ey or combination of keys that you would like to use for logging this event 6 Click OK To delete a Custom Event from the Custom Events Scheme k Locate Events in the Tools panel on the right 2 Place the mouse cursor over the custom event you want to delete icons appear on the right 3 Click the Delete icon A Delete Custom Event dialog box opens 4 Click Delete event to confirm 4 3 3 1 Logging events To manually log events you must first define a Custom Events scheme that contains the events you want to log see the section above To manually log an event 1 Make sure the correct Replay tab is active Make sure you have defined the custom events that you would like to log 3 While replaying or pausing a recording press the shortcut key on your keyboard associated to the event you want to log Alternatively click the Log icon that appears when placing the mouse cursor over an event type in the Custom Events list on the right 4 4 Managing snapshots and mapping eye gaze Wearable eye tacking devices such as Tobii Pro Glasses 2 produce eye gaze data mapped to a coordinate system relative to the wearable eye tracker and the recorded video not to static objects of interest in the environment around the participant wear ing the eye tracker For most statistical numerical analysis to be meaningful the collected eye tracking data needs to be mapped on to objects of interest and into a new coordinate system with its origin fix
44. ges are allowed as long as the final snapshot file matches the snapshot requirements D2 Merging projects Merging projects does not support merging multiple sets of mapped gaze data for a single Recording Snapshot combination This means that the coding work needs to be split by either Recordings or Snapshots Multiple people cannot work on the same Recording Snapshot pair in parallel 42 Appendix D Limitations Tobi Pro Glasses Analyzer User s manual v 1 25 en US Appendix E Software Features E1 Recording Replay Feature Full Edition Coder Edition Full recording replay Event logging Video export of recordings and recording segments E2 Mapping Feature Full Edition Coder Edition Manual fixation mapping to snapshot images Automatic fixation mapping to snapshot images see note below a The automatic fixation mapping function is limited to 1 hour of total queued video time simultaneously For more capacity please contact your sales representative E3 Visualizations Feature Full Edition Coder Edition Static heat maps on snapshot images Static gaze plots on snapshot images E4 Areas of Interest AOls Feature Full Edition Coder Edition Create and edit AOls on snapshot images E5 Data Export Feature Full Edition Coder Edition Eye tracking data to text file tsv Visualizations as images png
45. h to verify that data has been mapped correctly onto the snapshot 4 4 2 2 Map data onto a snapshot automatically with Real World Mapping 1 If not already enabled click Snapshots switch just below the video replay to enable mapping 2 Inthe grid list of snapshot images select the snapshot onto which you want to map data The Snapshot appears next to the recorded scene camera video Select the interval you want to map automatically on the time line Right click on the chosen interval or click the ellipsis located directly over the time line and choose Run automatic mapping If needed you can zoom in the time line to make the interval selection easier The interval is now placed in the processing queue and Real World Mapping starts the automatic mapping 5 Now you can choose to create another mapping task by repeating steps 4 to 6 and place it in the processing queue or if you don t have any more pending tasks continue to step 8 6 You can check the jobs placed in queue by clicking the number on the top right end of the window 7 When the automatic mapping is completed a diagram shows on the time line with the confidence results for every frame This diagram shows how Real World Mapping classifies each point of the automatic mapping A high bar indi cates that Real World Mapping thinks the mapping has a high confidence a lower bar means that Real World Mapping couldn t determine the mapping with confidence it could b
46. he Applications menu A list of recent projects is displayed 3 If the project that you would like to open is in the Recent project list double click the name of the project and the project will open If the project that you would like to open is not in the Recent projects list click the Browse button Locate and select the project you would like to open in the Windows File Manager and Click Open and the project will open 4 1 3 Import and merge projects Importing data from another project into a previously created project lets you merge them together This is useful for example in studies where data may have been collected at multiple research locations and where data should be merged into a single proj ect in Tobii Glasses Analysis Software to enable creation of visualizations and combined data export When importing one project into another project snapshot images with the same file name and same checksum will be treated as the same snapshot image All data mapped onto these snapshots will be merged into one Analysis Data Set If there are conflicts you will be prompted to decide what to keep or replace Tobi Pro Glasses Analyzer User s manual v 1 25 en US 4 Basic operations in Tobii Pro Glasses Analyzer 9 H When importing data it is always recommended to create a backup of the original project before merging any data for security purposes For more information on how to do this please see 4 7 4 Backing up projects page 10 To
47. he image file png or jpg on your computer that you want to use as snapshot and click Open An import prog ress bar appears 3 Once the snapshot image has been imported click OK To import a snapshot from the Tools Panel in a replay tab 1 Locate the Gaze Data Tool in the Tools panel on the right Select the Snapshots tab To the right of the text Snapshot images click the icon The Import snapshot dialog box opens O M Locate the image file png or jpg on your computer you want to use as a snapshot and click Open An import prog ress bar appears 5 Once the snapshot image has been imported click OK To import multiple instances of the same snapshot image 1 Create and save multiple copies of the image file you want to use as snapshots 2 Give each image file a unique file name 3 For each copy of the image file follow the instructions in the section above to import snapshot images 4 4 2 Mapping data onto a snapshot Wearable eye tracking devices such as Tobii Pro Glasses 2 produce eye gaze data mapped to a coordinate system relative to the wearable eye tracker and the recorded video not to static objects of interest in the environment around the participant wear ing the eye tracker For most statistical numerical analysis to be meaningful the collected eye tracking data needs to be mapped on to objects of interest and into a new coordinate system with its origin fixed in the environment around the par
48. her analysis outside of Tobii Pro Glasses Analyzer See section 4 8 Exporting Tobii Pro Glasses 2 data for further analysis page 22 3 2 Overview Tobii Pro Glasses Analyzer User Interface The following section gives you an overview over the Tobii Pro Glasses Analyzer user interface To learn how to perform different tasks in the software see section 4 Basic operations in Tobii Pro Glasses Analyzer page 9 Tobii Pro Glasses Analyzer has been optimized to enable easy and efficient preparation and analysis of eye tracking data col lected with the Tobii Pro Glasses 2 Eye Tracker Most Tobii Pro Glasses Analyzer tools are tab based which gives you the free dom to work on multiple recordings map data onto several snapshots and create numerous visualizations in parallel Multiple tabs can stay open simultaneously but only one tab can be active at any time 3 2 1 Application menu The Application menu is presented when you open Tobii Pro Glasses Analyzer The Application menu corresponds to a File menu Here you can create new projects or open existing ones The software license is also handled from the Application menu Access the Application menu by clicking or tapping the Application menu button in the top left 6 3 Getting to know Tobii Pro Glasses Analyzer Tobi Pro Glasses Analyzer User s manual v 1 25 en US 3 2 2 Project Dashboard The Project Dashboard is the starting point for working with a project in Tobii Pro Glasses Analyzer Yo
49. hest value Tobi Pro Glasses Analyzer User s manual v 1 25 en US Appendix C How heat maps are calculated 39 Heatmap Count image xy pixels However this basic process would result in a rather useless image with small colored dots distributed over the image What we do instead is add color values to all the points within a certain distance of the fixation location and the color values gradually decrease as we move away from the fixation point This process ensures that the color distribution results in a more smooth heat map image and gives some biological relevance to the color mapping KT Tobi Heat Map The distribution of values around a fixation point is accomplished by using an approximation to the Gaussian curve that is commonly used in 2D image processing a cubic Hermite spline polynomial cspline The specific function of the polynomial used is t2 8 2t represented by the blue line in the graph below The orange line represents the fixation point and thus maximum color value Heatmap Colour distribution Cubic Hermite Spline polynomial y t2 3 2t 1 1 E a T 05 l Linear A interpolation 0 aE 100 pixels The radius of the function can be adjusted from the Settings panel on the right hand side of the window and is set by default at 50 pixels corresponding to a total kernel of 100 pixels This default kernel was calc
50. ic fixation For additional information about the fixation filters please read the following Tobii Pro whitepapers that can be found H on Tobi Pro website Tobii I VT Fixation Filter Algorithm Description Determining the Tobi I VT Fixation Filter s Default Values Appendix B Fixation Filters how they work and what effects they 33 Tobi Pro Glasses Analyzer User s manual v 1 25 en US have B 7 Merge adjacent fixations The purpose of the Merge adjacent fixations function is to merge fixations that have been incorrectly classified as multiple short fixations Noise and other disturbances can cause the I VT classifier to incorrectly classify data points that should belong to a fixation as not being part of it This will split the fixation into multiple fixations which are all located close together The Merge adjacent fixations function can be set to merge these multiple fixations into one fixation The Merge adjacent fixations function has two threshold parameters Max time between fixations defines the maximum time interval between separate fixations that should be merged Mav angle between fixations defines the maximum visual angle of the eyes between separate fixations that should be merged For additional information about the fixation filters please read the following Tobii Pro whitepapers that can be found H on Tobi Pro website Tobii I VT Fixation Filter Algorithm Description Determining the Tobi I VT Fixa
51. iew Fixations are visualized as a yellow thick line saccades are visualized as a thin gray line and unknown eye movements are visualized as a striped thick gray line All settings are available in the Tools panel to the right of the video display area To Change Fixation Filter 1 Make sure the correct Replay tab is active 2 Inthe Tools panel on the right locate Gaze Data gt Settings gt Gaze Filter Tobi Pro Glasses Analyzer User s manual v 1 25 en US 4 Basic operations in Tobii Pro Glasses Analyzer 11 3 Open the Fixation Filter drop down menu by clicking the down arrow to the right of the currently active filter 4 Inthe drop down menu select the filter of your choice The available options are a Tobii I VT Fixation b Tobi I VT Attention c Raw d Create new Raw filter for custom settings e Create new I VT filter for custom settings 5 The new filter is now applied during replay i The Raw filter is the default setting when creating visualizations however if the Tobii I VT filter was used when map ping data onto snapshots the I VT filter will still be applied when a visualization is generated regardless of which filter is selected in the visualizations tab To change Gaze Point Overlay Fill Color Make sure the correct Replay tab is active In the Tools panel on the right locate Gaze Data gt Settings gt Overlay Fill Color Open the Overlay Fill Color drop down menu by clicking the down arrow
52. ilter drop down menu and change the appropriate variables Your custom filter settings will be saved as a new filter available in all parts of the software The I VT fixation filter may fail to correctly classify all eye movement recorded with Tobii Glasses 2 due to various factors for more information please see section B3 Fixation filters when they succeed and when they fail page 36 i It is strongly recommended that you always verify the performance of the fixation filter for your data if accurate fixation and saccade data is required for your study i For additional information about the fixation filters please read the following Tobii Pro whitepapers that can be found on Tobii Pro website Tobii l VT Fixation Filter Algorithm Description Determining the Tobii l VT Fixation Filter s Default Values The Raw filter is the default setting when creating visualizations and exporting metrics however if the Tobi I VT filter was used when mapping data onto snapshots the I VT filter will still be applied when a visualization is generated regardless of which filter is selected in the visualizations and the metrics export tab Appendix B Fixation Filters how they work and what effects they Tobi Pro Glasses Analyzer User s manual v 1 25 en US have 31 B2 1 Gap fill in interpolation The purpose of the Gap fill in function is to fill in data where gaze data points are missing For example this is to prevent a fixation in whi
53. ilters please read the following Tobii Pro whitepapers that can be found on Tobii Pro website Tobii l VT Fixation Filter Algorithm Description Determining the Tobii l VT Fixation Filter s Default Values B2 6 I VT fixation classifier The I VT fixation classifier is based on the I VT Velocity Threshold identification fixation filter as described by Salvucci and Goldberg 2000 and Komogortsev et Al 2010 It is a threshold function that operates on eye tracking data where each data point has an assigned angular velocity In Tobii Pro Glasses Analyzer angular velocity is assigned to eye tracking data in the Velocity calculator data processing function as described in the previous section The I VT fixation classifier applies an angular velocity threshold on each data point The threshold value is given in degrees second and is adjusted by setting the parameter Velocity threshold in the Fixation filter dialog box Data points with angular velocity below the threshold value are classified as being part of a fixation and data points above are classified as being part of a saccade According to the VT fixation classifier a fixation is an unbroken chain of raw data points all classified as fixation data points If the velocity cannot be calculated for a raw data point it is classified as UnknownEyeMovement The fixation coordinate is calculated as the arithmetic mean value of the coordinates of the data points belonging to the specif
54. in Tobi Pro Glasses Analyzer sees eee 9 4 1 1 Creadling a hew ProjOCt rissaniseisnasnieia T TE 9 4 1 2 Opening an existing ProjeCt 05255522 rn 52 c at ZES eia TH aaa aisanana R Y sa aani oait 9 4 1 3 Import ANd merge PYOjOCtSicscseccccccscecsscesectaaveccoeeenedereessaedasecnereesdeaseeed iaa rinkiin 9 4 1 4 Backing Up projects i cccccdiictsccetidats cette EEA EO AK AA ANAR ERAND EER 10 4 2 Importing data from Tobii Pro Glasses 2 sees sees sees resen 10 4 3 Replaying recordings and logging event sss sese ee ee eee 11 4 3 1 Replay SCuinGSisiiiicrceccvecteisaessarccahaimeveceestianecnasraseaieasestasignesadecanasnaranne TA Nean 11 4 3 2 Gaze data SOttings e sciiso estciadaeeidied esas idacin detaaea arated aad Manatees ETEO EREE 11 4 3 3 Managing and logging Custom Events in a recording sese sees ee ee eee eee 12 4 4 Managing snapshots and mapping eye GaZe sees eee sete cess eee ee eee eree eree 13 4 4 1 Importing snapshots qiies ciasne EE E niaaa an 14 4 4 2 Mapping data Onto a shapShOt cissed iina E a a aE eenaa 14 4 5 Creating and managing Areas of Interest LAOS 16 4 5 1 Drawing AOIS On SnapShots irice inai ni nae rani 16 4 5 2 Editing the shape of an existing AOL ee eee 16 4 5 3 Changing the size of an existing AO sese seer eee eee 16 4 5 4 Moving an existing AOI sss sese eee eee ereenn 17 4 5 5 Changing the name or appearance of an AOL eee ee eee 17 4 5 6 Undoing redoing AOI actions sse ee eee eee eee 17 4 5 7 Copying cutting
55. ion 4 3 Replaying recordings and logging events page 11 8 Coders Turn Snapshot mapping on if data is to be mapped onto snapshot images See section 4 4 2 Mapping data onto a snapshot page 14 Tobi Pro Glasses Analyzer User s manual v 1 25 en US 3 Getting to know Tobii Pro Glasses Analyzer 5 9 Coders Map gaze data onto the correct snapshot images and log Custom events in the recordings See section 4 3 Replaying recordings and logging events page 11 It is advisable to map gaze data and add custom events at the same time to avoid working through the recordings more than once 10 Coders Once all assigned data has been mapped and all events have been added make sure that everything is saved then make a copy of the master folder somewhere else on your computer Never modify the original data files In the new copy delete the media folder this will make the final zip file smaller and mean faster transfer times especially impor tant for those with low bandwidth 11 Zip the new copied project folder which now has no media folder within and send it back to the analyst 12 Unzip and import the received files into the original project See section 4 1 3 Import and merge projects page 9 Coders may also import recordings and snapshots into projects they create themselves if the coders use the exact same Cus tom Event names when adding new event types This option enables multiple locations to collect and code data and then
56. is a Data Set and when data is mapped onto a snapshot a new Data Set is created containing the mapped data In Tobii Pro Glasses Analyzer these data sets are referred to as Analysis Sets There are two types of Data Sets Analysis Sets Full Recording Data Full Recording Data is the full set of data based on the recording start and end events These Analysis Sets are created automatically Snapshot Analysis Data Snapshot Analysis Data sets are automatically created when data is mapped onto a snapshot image The Snapshot Analysis Data set has the same name as the snapshot onto which the data was mapped All data mapped onto a specific snapshot will belong to the same Snapshot Analysis Data set Data within a Snapshot Analysis Data set is further divided into smaller subsets of data i e Recordings and Recording Intervals Intervals are created automatically for data associated to a recording if there is amore than 5 second gap of mapped data Analysis Data Set structure Snapshot Analysis Set 1 Recording 1 Interval 1 Interval 2 Recording 2 Interval 1 Interval 2 Snapshot Analysis Set 2 8 3 Getting to know Tobii Pro Glasses Analyzer Tobi Pro Glasses Analyzer User s manual v 1 25 en US 4 Basic operations in Tobii Pro Glasses Analyzer The following sections describe in detail how to perform basic operations with Tobii Pro Glasses Analyzer Most Tobii Pro Glasses Analyzer tools are tab based which gi
57. king metrics export to Open XML xlxs compatible spreadsheet S Currently available metrics Interval Duration Interval Start AOI Time To First Fixation AOI Total Visit Duration AOI Total Visit Duration include zeroes AOI Average Visit Duration AOI Visit Count AOI Visit Count include zeroes AOI Total Fixation Duration AOI Total Fixation Duration include zeroes AOI Average Fixation Duration AOI Fixation Count AOI Fixation Count include zeroes Percent Fixated Tobi Pro Glasses Analyzer User s manual v 1 25 en US Appendix E Software Features 45 Appendix F Software System Requirements F1 Minimum System Requirements Windows 7 or later 64 bit Windows 1280x768 px screen resolution 2nd Gen Dual Core Intel Core i5 2 3 GHz or higher 4GB RAM Integrated Graphics Card 256GB 7200RPM Hard Drive F2 Recommended System Configuration 5 Windows 7 or later 64 bit Windows 1920x1080 px screen resolution 4th Gen Quad Core Intel Core i7 3 0 GHz or higher BOB RAM Dedicated Graphics Card 256GB SSD Hard Drive 46 Appendix F Software System Requirements Tobii Pro Glasses Analyzer User s manual v 1 25 en US Appendix G Snapshot Considerations When Using Real World Mapping For Real World Mapping to be able to interpret the snapshot images correctly there are a few things you should consider when you s
58. lasses Analyzer 21 1 To define the beginning and end of the video clip desired for export first locate the in and out markers either side of the play head 2 Drag the in point the left marker to the beginning of the desired clip 3 Drag the out point the right marker to the end of the desired clip 4 Right click on the yellow clip bar or left click on the menu symbol 5 ln the file manager dialog box locate the folder you want to save the file in 6 ln the File name field enter a file name for your video clip 7 Click Save to save the video clip 8 After the export process has begun the progress can be checked by clicking on the activity icon in the activity dialogue 0 clips can be viewed all exported and currently exporting vide 4 8 Exporting Tobii Pro Glasses 2 data for further analysis Tobii Pro Glasses Analyzer provides two different tools that enable you to generate and export eye tracking related metrics and raw data Metrics Export and Data Export The exported data can be used to process and analyze the data in third party data processing and analysis software such as SPSS Matlab Excel or similar Exports from Data Export are saved in a tab separated values file tsv and follows the Unicode standard exports from Metrics Export are saved as a Microsoft Excel file xlsx with each metric in a separate spreadsheet After exporting the export output file s can easily be imported into other software such
59. lassification The only setting available for Tobii Pro Glasses 2 recordings is Average which makes an average of the position data from the left and the right eye If only one eye is detected it uses the data from that eye B2 3 Noise reduction Moving Median All measurement systems including eye trackers experience noise Noise can come from imperfections in the system setup as well as from influences and interferences from the environment in which the measurement takes place In eye tracking research where the fixation is the eye movement of interest other minor eye movements such as tremor and microsaccades Yarbus 1967 can also be seen as noise In the most basic form I VT filters calculate the velocity by multiplying the change in position between two consecutive sample points If the sampling interval is long the eye will have time to do quite large shifts of direction between two samples which makes it easy for the eye tracker to distinguish between real eye movements and noise The higher the sampling frequency the smaller the eye movement will be between two consecutive samples at a given eye velocity Noise will therefore have a greater impact in a high frequency system even though it has the same magnitude as in a low frequency system The Moving Median noise reduction function is accessible using the Tobii I VT fixation filter and the Raw data filter The median noise reduction function is a symmetric moving median filter It pro
60. livered to you in an e mail when you pur chase the software from Tobii Pro From time to time Tobii Pro will release updates of Tobii Pro Glasses Analyzer that will improve performance and or introduce new functionality When a new version of the Tobii Pro Glasses Analyzer is available the user will be notified with an alert sym bol at the top of the user interface if the computer is online Alternatively the latest software may be downloaded from the Tobii Pro Support website http www tobii com analysissupport Make sure to regularly check for and update to the latest version of the software 2 2 Installing Tobii Pro Glasses Analyzer Tobii Pro Glasses Analyzer uses various Windows programming components and drivers If they have not been previously in stalled on your computer these components are automatically installed by the Tobii Pro Glasses Analyzer installer To Install Tobii Pro Glasses Analyzer 1 Locate and run the installation file on your computer then follow the instructions on the screen 2 Once prompted to accept the license agreement read the license agreement and click Accept 3 Once the installation is completed start the application 4 Once prompted to provide the license key for Tobii Pro Glasses Analyzer type in the license key provided in the product purchase e mail and then click Activate 2 3 Updating Tobii Pro Glasses Analyzer From time to time Tobii Pro will release updates of the Tobii Pro Glasses Analyz
61. lot background In the Tools panel on the right in the gaze plot settings tool in the Background drop down menu select the background you want for the gaze plot 20 4 Basic operations in Tobii Pro Glasses Analyzer Tobii Pro Glasses Analyzer User s manual v 1 25 en US Snapshot Transparent Black White Fixation Fixation type ln the Tools panel on the right in the gaze plot settings tool in the gaze filter drop down menu select which data filter to use for this gaze plot Duration Same Size Scale Gaze point scale ln the Tools panel on the right in the gaze plot settings tool click and drag the Opacity slider handle to adjust the scale of the gaze points Border Color Gaze point border color 1 Inthe Tools panel on the right in the gaze plot settings tool click on the border color drop down menu and select cus tom color or none 2 If custom color is selected a second drop down box will appear to the right of the border color drop down menu click on this to choose the border color of the gaze points Fill Color Gaze point fill color 1 Inthe Tools panel on the right in the gaze plot settings tool click on the fill color drop down menu and select same color all gaze points will be the same color or recording colors all the gaze points from one recording will be one color but each recording will have a different color 2 If same color is selected a second drop down
62. lt Enabled Minimum fixation duration 60 ms B2 9 2 Tobii I VT Fixation This is the gaze filter included in version 1 17 and later of Tobii Pro Glasses Analyzer This filter is suitable for controlled studies where only fixations and saccades are present in the collected data Like with other velocity based filters this filter will not classify smooth pursuit and VOR eye movements correctly Please see appendix B in the User s manual for details To calculate the gaze velocity for data mapped to snapshots this preset uses the Gaze Position 3D coordinates to calculate the true eye velocity x Gap fill in interpolation Default Disabled Eye selection Default Average Noise reduction Default Moving Median Window size 3 samples Velocity calculator Default window length 20 ms l VT fixation classifier Default Threshold 30 degrees second Merge adjacent fixations Default Enabled Max time between fixations 75 ms Max angle between fixations 0 5 degrees Discard short fixations Default Enabled Minimum fixation duration 60 ms B2 9 3 Tobii I VT Attention This gaze filter preset is included in version 1 17 and later of Tobi Pro Glasses Analyzer The Tobi VT Attention filter preset is suitable for situations where you only want to study attention without separating any eye movements This preset has the I VT fixation classifier set to 100 degrees second and will thus in a
63. me Name of the recording Recording Date Date when the recording was made YYYY MM DD Recording Start Time Time when the recording was started HH MM SS mmm Recording Duration The duration of the recording Milliseconds Recording Timestamp Timestamp counted from the start of the Milliseconds recording t0 0 Gaze data Gaze Point X Horizontal coordinate of the averaged Pixels left and right eye gaze point Gaze Point Y Vertical coordinate of the averaged left Pixels and right eye gaze point Gaze Direction Left Gaze direction X Y Z of the left eye Millimeters For details see A7 1 Gaze Direction Coordinate system page 30 Gaze Direction Right Gaze direction X Y Z of the right eye Millimeters For details see A1 1 Gaze Direction Coordinate system page 30 Pupil Position Left Pupil Position X Y Z of the right eye Millimeters Pupil Position Right Pupil Position X Y Z of the right eye Millimeters Pupil Diameter Left Estimated size of the left eye pupil Millimeters Pupil Diameter Right Estimated size of the right eye pupil Millimeters 26 4 Basic operations in Tobii Pro Glasses Analyzer Tobi Pro Glasses Analyzer User s manual v 1 25 en US Eye Movement Type Type of eye movement classified by the Fixation Saccade Eye generates one column per Snapshot fixation filter NotFoundMovement UnknownEyeMovement Eye Movement Type Index Count is an auto increment number
64. mera video If only one eye is tracked for a given sample the distance for the previously calculated gaze point is used You can open and replay any of the listed recordings from the Recordings List To open a recording double click on the record ing or right click and choose Open REA Dashboard main menu You will find the tools for importing visualizing and exporting your eye tracking data in the main menu When you select an item in the main menu a window or a new tab will open You can have multiple tabs open but only one can be active at a time Import Import Glasses Recordings Here is where you import your Tobii Pro Glasses 2 data from the Recording Unit s SD memory card Snapshots Here is where you import snapshots i e still images of environments and objects of interest in the envi ronment that you want to analyze in detail Mapping of data onto snapshots makes data aggregation easier and enables you to create visualizations like heat maps Coding Data Here is where you can import coding data i e if you have several coders working on one project you can use this function to merge the data together in one project Visualizations Here is where you create visualizations heat maps gaze plots based on the gaze data on top of you snapshots For visualiza tions to appear on a snapshot image data must have been mapped onto the snapshot AOI editor Here is where you draw areas of interest AOI on your snap
65. n down before deactivating 5 If you start Tobi Pro Glasses Analyzer again the License menu will be shown 6 Enter your Licence and click the Activate button if you wish to reactivate your License i One Licence key can be activated on one machine at a time if that machine has multiple users Tobii Pro Glasses An alyzer will work for all of them Tobii Pro Glasses Analyzer User s manual v 1 25 en US 2 Installing and Updating Tobii Pro Glasses Analyzer 3 3 Getting to know Tobi Pro Glasses Analyzer The following section gives you an overview of the work process and user interface of Tobii Pro Glasses Analyzer To learn how to perform certain operations in the user interface see section 4 Basic operations in Tobii Pro Glasses Analyzer page 9 Most Tobii Pro Glasses Analyzer tools are tab based which gives you the freedom to work on multiple recordings map data on to several snapshots or create numerous visualizations in parallel Multiple tabs can be open simultaneously but only one tab can be active at any time 3 1 Work flow guide Usage scenarios Tobii Pro Glasses Analyzer allows you to import your Tobii Pro Glasses 2 data from the SD memory card on which the record ings were made 3 1 1 Scenario Qualitative research based on replaying recordings Tobii Pro Glasses Analyzer provides basic tools for qualitative research in which the analyst looks through and interprets video replays of recordings made with Tobii Pro Glas
66. ncrease or decrease video replay speed 1 Click on the Replay speed control icon on the bottom left above the Replay Time Line the Replay speed slider will appear 2 On the Replay speed slider click and drag the handle to either increase up or decrease down the replaying speed To Increase or decrease replay audio volume 1 Click on the Audio volume control icon on the bottom right above the Replay Time Line the Audio Volume slider will appear 2 On the Audio volume slider click and drag the handle to increase up or decrease down volume To change the Recording Time Line Zoom Range 1 Click and drag the Zoom handles above the Replay Time Line 4 3 2 Gaze data settings During replay of a recording gaze data is first processed and classified by the fixation filter and then superimposed on the re corded scene camera video The eye movement classification algorithm the fixation filter and the appearance of the visualized gaze data can be customized to fit the needs of the researcher analyst The fixation filter processes and classifies the recorded gaze data samples into fixations and other eye movements For details on how they work and what effects they have on your da ta see section Appendix B Fixation Filters how they work and what effects they have page 31 When the I VT fixation filter is enabled the classified eye movements fixation saccade UnknownEyeMovement are visualized below the timeline in the replay v
67. parameters eerie eee XT EEKEREN NA ERREAREN E ERN RAE 31 B2 LST AE H Fixation Filter Gd eT 31 B2 1 Gap fill in interpolation c ccccccececeeeecceeeeeeeecceneeeeeeeeeseacaeeeeeeeececsnaeeeeeeseseesneeeees 32 B2 2 Eye SCIOCUOM PTT 32 B2 3 Noise reduction Moving Median sss ssssesgszsssvsssss sss rss ss cast ess cessa seas atn rag rentas r res 32 B2 4 Noise reduction Moving AVerage syg 5ss ass yT cece ee Tax TY 325494 589 aaa 33 B2 5 VelOCity calculo airsan niee Anaa EREA DAAA taduehserucaehantbetahsnd AASEN 33 B2 6 Baue ee TTT 33 B2 7 Merge adjacent fXAtlOMS wis cis icesccccctcescsadsinetinass RR TAAR EaR ii ran aiia ra hiaai 34 B2 8 Discard Shor TXatlons TTT 34 B2 9 Tobii I VT Fixation filter default parameters sse ee eee ee eee eee eee 34 B3 Fixation filters when they succeed and when they fall eee eee 36 B4 The effects of mapping data onto snapshot with Tobi I VT or Raw fixation filter ss eee ee ee ee ee es 37 Append O How heatmaps are calculat d encnecisrnernsieimnenseerastenssacinnedsanionessiasemmeneaenemmensiavannanstan eyset 39 C1 How are heat maps calculated sss sees essere 39 C1 1 BASIC CONCEDE ite oan detach rna EAE EEEE 39 C1 2 Tobi Gat MAD sisremare a A RAAE ATEA ARIRAN 40 APPEND DNAN O NS kenesone eerie EEEE PEE EERENS 42 D1 MMAPSMOUS E E E E A A E T 42 D2 Merging projo irnn E EEEE RA ETE 42 Append 9 Sowar Fente unasant eee 43 E1 Recording Replay irsrsrreisirrsrrirserinmnes zas rS
68. ppearance of a heat map can be modified to better convey research findings No underlying data changes To customize the appearance of the heat map Radius Fixation coverage ln the Tools panel on the right in the heat map settings tool click and drag the Radius slider handle to adjust the size of each fixations contribution to the heat map to the left for smaller to the right for larger For more details read section C1 How are heat maps calculated page 39 Color Heat map color scheme ln the Tools panel on the right in the heat map settings tool in the Color drop down menus select colors to represent low middle and high level of data Default colors from left to right Green Yellow Red Scale max value Heat map gain intensity This option is only available when heat map type is either Absolute count or Absolute duration 1 ln the Tools panel on the right in the heat map settings tool tick the Scale max value checkbox 2 To adjust the Scale max value use the up down arrows or type in values to the left of the checkbox Opacity Heat map transparency In the Tools panel on the right in the heat map settings tool click and drag the Opacity slider handle to adjust the opac ity of the heat map Background Heat map background In the Tools panel on the right in the heat map settings tool in the Background drop down menu select the background you want for the heat map Snapshot Tran
69. pshot coordinate system is based on the resolution of the snapshot image All gaze data point coordinates in the export output file are given in units referred to as pixels To understand where a gaze point xi yi is located on the scene camera video or on the snapshot the size of the scene camera video or the snapshot need to be taken into consideration Size of scene camera video in pixels Horizontal X axis 1920 pixels Vertical Y axis 1080 pixels Size of a snapshot in pixels Horizontal X axis Given by the data type Width Snapshot Name in the export output file Vertical Y axis 1080 pixels Given by the data type Height Snapshot Name in the export output file Origin Recorded gaze point xi yi Mapped gaze point xi yi Scene Camera Video Snapshot Image Appendix A Coordinate systems and mapping of data onto Tobi Pro Glasses Analyzer User s manual v 1 25 en US snapshots 29 i Tobii Pro Glasses 2 uses the intersection of the gaze vectors from the two eyes to calculate the distance at which the participant is looking at If the eye tracker loses tracking of one of the eyes it will continue using the last known distance until it gets gaze data from both eyes again A1 1 Gaze Direction Coordinate system The GazeDirectionRight and GazeDirectionLeft X Y and Z values are available in the Data Export in Tobii Pro Glasses Analyzer This is a Unit Vector based in the
70. r all data from all recordings is exported to a single tsv file You cannot export subsets of data The Raw filter is the default setting when exporting data however if the Tobii I VT filter was used when mapping data Li onto snapshots the I VT filter will still be applied when data is exported regardless of which filter is selected 4 8 2 1 Data export format Exports from Data Export are saved in a tab separated values file tsv and follows the Unicode standard The tsv output file contains columns Each column contains data of a type given by the data type name found in the top row for the corresponding column All data types are described in the table below Snapshots have a set of their own columns with information about the Tobii Pro Glasses Analyzer User s manual v 1 25 en US 4 Basic operations in Tobii Pro Glasses Analyzer 25 Snapshot itself and the gaze data mapped to it Thus each added Snapshot produce additional columns in the output file The same is true for Areas of Interests and each AOI will have their own column in the data export i All rows in a data export file have a Recording Timestamp value except the first row which contains column data type name The time stamp is shown in milliseconds and starts at O at the beginning of each recording Since all recorded eye gaze data samples have been recorded in a sequence all eye gaze data points in a recording will have different timestamps However some events m
71. regardless of which filter is selected 4 8 1 1 Metrics Export definitions A number of eye tracking related metrics are available for export please see the Metrics Export tab for the currently available metrics Metric Name Description Format Interval Duration The duration of all time intervals for HH MM SS mmm each Analysis Set including averages medians sums and counts Interval Start The start time of all time intervals for HH MM SS mmm each Analysis Set including averages medians and counts AOI Time To First Fixation The time to first fixation for each AOI on HH MM SS mmm all Media including averages medians count and Recording durations AOI Total Visit Duration The total time each participant has vis HH MM SS mmm ited each AOI on all Media including averages medians sums the share of total time spent in each AOI out of all AOls and the percentage of Partici pants that visited each AOI at least once Descriptive statistics only based on recordings with fixations within the AOls Tobi Pro Glasses Analyzer User s manual v 1 25 en US 4 Basic operations in Tobii Pro Glasses Analyzer 23 AOI Total Visit Duration include The total time each participant has vis zeroes ited each AOI on all Media including averages medians sums the share of total time spent in each AOI out of all AOls and the percentage of Partici pants that visited each AOI at least once Descriptive sta
72. s tool select gaze plot 3 Inthe Tools panel on the right in the Analysis Sets tool select or import for more information on how to import a snap shot please see 4 4 7 Importing snapshots page 14 the snapshot Analysis Set that you want to use as the base of your visualization 4 Inthe Tools panel on the right in the Data Selection tool select deselect the recordings and or intervals that you want to visualize in the gaze plot To see the intervals included click the arrows to the left of the recording checkboxes to ex pand the view An interval is a subset of mapped data associated to a specific recording These subsets are generated automatically when there is a gap of at least 5 seconds in the mapped data 5 The gaze plot is now drawn on top of the snapshot image To be able to create gaze plots on snapshots at least one snapshot in the project has to have gaze data mapped onto it 4 6 5 Customizing gaze plots The appearance of a gaze plot can be modified to better convey research findings No underlying data changes To customize the appearance of a gaze plot Gaze Filter Gaze Filter type ln the Tools panel on the right in the gaze plot settings tool in the gaze filter drop down menu select which data filter to use for this gaze plot Raw Tobii I VT Fixation Tobii I VT Attention Create new Raw filter for custom settings Create new I VT filter for custom settings Background Gaze p
73. send it to a central location for analysis without having to first send the collected data to a central location Do not modify the original data it is recommended that you create a backup of the zip when first received and archive it so as to avoid any data loss 3 1 5 Scenario Several data collection locations In studies where data may have been collected and imported into Tobii Pro Glasses Analyzer at multiple research locations projects from the different locations need to be merged into a single project for combined analysis and export 3 1 5 1 Workflow quick guide Several data collection locations See section 4 1 3 Import and merge projects page 9 3 1 6 Scenario Getting raw data from Tobii Pro Glasses 2 recordings Data stored by the Glasses 2 Recording Unit onto the SD memory card is stored in a proprietary format to improve performance of the Tobii Pro Glasses 2 system To acquire a raw data file with the recorded eye tracking data the recorded data needs to first pass though Tobii Pro Glasses Analyzer 3 1 6 1 Workflow guide Getting raw data from Tobii Pro Glasses 2 recordings 1 Open an existing project or create a new project in Tobii Pro Glasses Analyzer See section 4 1 Managing projects in Tobii Pro Glasses Analyzer page 9 2 Import Tobii Pro Glasses 2 data from the SD memory cards used during recording See section 4 2 Importing data from Tobii Pro Glasses 2 page 10 3 Export the data and metrics for furt
74. ses 2 The gaze point is shown as colored dots on the recorded scene camera video during replay of the recorded eye tracking data Tools for logging interesting and important events in the recording are al so included These Custom Events for example Participant picks up item 1 can also be exported together with all the other data collected during a recording Shki Workflow quick guide Qualitative research based on replaying recordings 1 Open an existing project or create a new project in Tobii Pro Glasses Analyzer See section 4 1 Managing projects in Tobii Pro Glasses Analyzer page 9 2 Import Tobii Pro Glasses 2 data from the SD memory cards used during recording See section 4 2 Importing data from Tobii Pro Glasses 2 page 10 3 Replay the relevant recordings while analyzing and logging events and behavior in the videos See section 4 3 Replay ing recordings and logging events page 11 4 Export log events and videos to incorporate findings in your presentation See section 4 8 Exporting Tobii Pro Glasses 2 data for further analysis page 22 and 4 7 Exporting a Video Clip page 21 Dolce Scenario Creating visualizations heat maps Gaze data visualizations such as heat maps can be incorporated in research reports to illustrate what participants were looking at and attending to Gaze data visualizations can be created on top of snapshot images once data has been mapped onto the snapshots rs 2l Workflow quick gui
75. shot images AOls are drawn onto snapshots to enable numerical statistical analysis based on regions Once an AOI has been created on a snapshot you can export eye tracking metrics for this snapshot and also see in the data export output file whether or not a participant s gaze point was inside an AOI Metrics Export Here is where you export your eye tracking metrics based on snapshots and AOls for further analysis in third party software such as SPSS Excel Matlab or similar Data Export Here is where you export your Tobii Pro Glasses 2 data for further analysis in third party software such as SPSS Excel Matlab or similar Tobi Pro Glasses Analyzer User s manual v 1 25 en US 3 Getting to know Tobi Pro Glasses Analyzer 7 3 3 Data and media structure in the software Tobii Pro Glasses Analyzer organizes and stores data in projects Each project can contain numerous recordings participants snapshots custom events etc The data structure in Tobii Pro Glasses Analyzer Project Recordings Scene camera video Full recording data set Eye gaze data Events Metadata Participant name duration date etc Snapshots Snapshot image Snapshot analysis data set mapped eye gaze data 3 3 1 Data Sets and Analysis Sets Often when you visualize or analyze eye tracking data you are only interested in a small specific portion of your data specific Data Sets In Tobii Pro Glasses Analyzer each individual recording
76. snapshot manually 1 If not already enabled click the Snapshots switch just below the video replay to enable mapping 2 Locate the Gaze Data Tool in the Tools panel on the right 3 Select the Snapshots tab 4 Select Deselect the Automatically step to next fixation checkbox Selecting the Automatically step to next fixation check box will cause the paused reply to automatically jump to the next fixation raw data point on the time line as the previous one is already mapped This eliminates the need to use arrow keys to step forward manually on the time line 5 Inthe grid list of snapshot images select the snapshot onto which you want to map data The Snapshot appears next to the recorded scene camera video At any time during mapping of data you can switch back and forth between different snapshots without losing mapped data 6 While skimming through the recording replay locate and pause the video at the start of the section that you want to map onto the selected snapshot 7 To map data onto the snapshot first locate the gaze data point circle superimposed on the video in the recorded video Click once in the corresponding location on the snapshot image as precisely as possible 8 Continue this process until all data has been mapped onto the active snapshot As data points are mapped onto the snapshot the snapshot time line will indicate at which times data points have been mapped 9 Make sure to replay the recording straight throug
77. sparent Black White Tobi Pro Glasses Analyzer User s manual v 1 25 en US 4 Basic operations in Tobii Pro Glasses Analyzer 19 4 6 3 Saving a heat map as an image Heat maps can be saved as image files to be incorporated later into reports Available image file formats are png and jpg To save a heat map Right click within the heat map area A context menu appears with the option to Save to File In the Context menu select Save to File A Windows File Manager dialog box opens In the file manager dialog box locate the folder you want to save the file in In the File name field enter a file name for your heat map a fF ON gt In the Save as Type dropdown menu select desired file type png or jpg For heat maps with transparent back grounds the file type must be png to maintain the transparency 6 Click Save to save the heat map 4 6 4 Creating gaze plots The gaze plot visualization shows the sequence and position of fixations dots on a snapshot image The size of the dots indi cates the fixation duration and the numbers in the dots represent the order of the fixations Gaze plots can be used to illustrate the gaze pattern of a single test participant throughout the entire eye tracking session or of several participants in a short time interval To generate a gaze plot 1 Select Visualizations in the Dashboard Menu The Visualizations tab will open 2 Inthe Visualization Type and Setting
78. te the Tobi project project file that you would like to import Select the appropriate project and click Open A Coding data import dialog box will appear Select whether to Keep data from existing Project meaning merge the coding data from the current project and the project that is being imported or Replace existing data with imported data meaning overwrite the data in the current project with the data from the project that is being imported To import the selected Coding Data click import Backing up projects Make sure to back up your projects regularly To back up project data 1 2 4 2 Using the standard Windows File Manager locate the project folder for the project that you want to back up The de fault location is user Documents Tobii Pro Glasses Analyzer Copy the Project folder to a new location Files can be compressed to reduce storage space Importing data from Tobii Pro Glasses 2 To import Tobii Pro Glasses 2 data 1 2 10 Insert the SD memory card used during recording into the SD card slot on your computer In the Application Menu in Tobi Pro Glasses Analyzer create a new empty project See section 4 1 1 Creating a new project page 9 In the Project Dashboard Menu click Import and then Glasses Recording A Glasses Data Import dialog box opens In the Glasses Data Import dialog box locate and select the Tobii Pro Glasses 2 data file named ttgp on the SD memory card
79. that fixated within each AOI at least once Descriptive statistics also include recordings with O fixations with in the AOls AOI Average Fixation Duration The average duration of the fixations HH MM SS mmm within each AOI on all Media including averages medians and the total Analy sis Set and Recording durations AOI Fixation Count The number of fixation within each AOI Number on all Media including averages me dians sums total number of fixations within the Analysis Set and the total Analysis Set and Recording Durations Descriptive statistics only based on re cordings with fixations within the AOls 24 4 Basic operations in Tobii Pro Glasses Analyzer Tobii Pro Glasses Analyzer User s manual v 1 25 en US AOI Fixation Count include zeroes The number of fixation within each AOI on all Media including averages me dians sums total number of fixations within the Analysis Set and the total Analysis Set and Recording Durations Descriptive statistics also include re cordings with O fixations within the AOls Percent Fixated The number of recordings in which par ticipants have fixated in an AOI at least once Exports from Metrics Export in Tobi Pro Glasses Analyzer are saved an Office Open XML compatible spreadsheet xlsx and is compatible with most spreadsheet software such as Microsoft Excel 2007 and later Google Sheets OpenOffice org or simi lar In the file each me
80. that you want to import 4 Basic operations in Tobii Pro Glasses Analyzer Tobi Pro Glasses Analyzer User s manual v 1 25 en US 5 Click Open to import the data 4 3 Replaying recordings and logging events During replay of a recording gaze data is first processed by the fixation filters in the software and then superimposed on the re corded scene camera video All replay takes place in replay tabs each open tab corresponds to a specific recording Multiple replay tabs can be open simultaneously but only one can be active and replayed at any time To open a Replay tab 1 ln the Recordings List double click the recording you want to replay and a Replay tab will open Alternatively In the Re cordings list right click the recording you want to replay and then select Open in Background tab in the context menu The tab will open but the Recordings List will still be visible To start video replay in a Replay tab 1 Click the Play button at the bottom centre above the Replay Time Line To pause replay of a recording 1 While the recording is replaying click the Pause button at the bottom centre above the Replay Time Line To skim through or jump to a location in the video replay 1 Click and drag the track slider below the video display area To step frame by frame in a recording 1 Click the arrows at either side of the Play button to step forward or backward frame by frame in the video 4 3 1 Replay settings To I
81. ticipant Tobii Pro Glasses Analyzer addresses this challenge by allowing the user map eye gaze data onto still images snapshots of environ ments and objects of interest Data from a recording can be mapped onto one or several snapshot images The snapshots are 14 4 Basic operations in Tobii Pro Glasses Analyzer Tobii Pro Glasses Analyzer User s manual v 1 25 en US used for generating visualizations such as heatmaps and Areas of Interest Before you start mapping data onto snapshots make sure to read section Appendix B Fixation Filters how they work and what effects they have page 31 The mapping can be done either manually or by using the Real World Mapping function which is Tobi Pro s new software for automatic mapping using advanced algorithms Real World Mapping is for the moment primarily designed for but not limited to shopper research studies See Appendix G Snapshot Considerations When Using Real World Mappingfor guidelines when choosing a suitable snapshot Real World Mapping contains a batch processing function where the user can place several mapping jobs in queue for sequential processing For the moment this function has no capacity limits applied but this will be limited to a total of one 1 hour of total recording time in the near future Users with need of longer batch mapping capacity may then purchase add on capacity for unlimited processing Please contact Tobii Sales for more information 4 4 2 1 Map data onto a
82. tion Filter s Default Values B2 8 Discard short fixations The purpose of the Discard short fixation function is to remove incorrectly classified fixations that have too short a duration to be real fixations As the brain needs to take in visual input for a while before it has enough data to process it a fixation which is when this visual input is collected cannot be infinitely short The Discard short fixation function can be set to remove these incorrectly classified fixations The Discard short fixations function can also be used to decrease the temporal resolution of fixation data The parameter Minimum fixation duration sets the threshold of how short a duration a fixation can have to be classified as a fixation All data points belonging to fixations shorter than the threshold value will be reclassified as non fixation data points For additional information about the fixation filters please read the following Tobii Pro whitepapers that can be found Li on Tobii Pro website Tobii I VT Fixation Filter Algorithm Description Determining the Tobi I VT Fixation Filter s Default Values B2 9 Tobi I VT Fixation filter default parameters Tobii Pro Glasses Analyzer includes a few preset settings for the Tobii I VT fixation filter The default parameters for these filters are defined below If you wish to modify the filter settings for you project choose the option Create new I VT filter from the Gaze Filter drop down menu
83. tistics also include recordings with 0 fixations within the AOls AOI Average Visit Duration The average duration each participant HH MM SS mmm has visited each AOI on all Media in cluding averages medians sums and the percentage of Participants that vis ited each AOI at least once AOI Visit Count The number of visits within each AOI on Number all Media including averages medians and the percentage of Participants that fixated within each AOI at least once Descriptive statistics only based on re cordings with fixations within the AOls AOI Visit Count include zeroes The number of visits within each AOI on all Media including averages medians and the percentage of Participants that fixated within each AOI at least once Descriptive statistics also include re cordings with O fixations within the AOls AOI Total Fixation Duration The total time each participant has fix HH MM SS mmm ated each AOI on all Media including averages median sums the share of total time spent in each AOI out of all AOls and the percentage of Partici pants that fixated within each AOI at least once Descriptive statistics only based on recordings with fixations with in the AOls AOI Total Fixation Duration include The total time each participant has fix zeroes ated each AOI on all Media including averages median sums the share of total time spent in each AOI out of all AOls and the percentage of Partici pants
84. to the right of the currently active color In the drop down menu select the color of your choice a fF ON The new color is now applied during replay To change Gaze Point Overlay Border Color 1 Make sure the correct Replay tab is active 2 Inthe Tools panel on the right locate Gaze Data gt Settings gt Overlay Border Color 3 Open the Overlay Border Color drop down menu by clicking the down arrow to the right of the current Border Color 4 Inthe drop down menu select the color of your choice 5 The new color is now applied during replay To change Gaze Point Opacity level 1 Make sure the correct Replay tab is active 2 Inthe Tools panel on the right locate Gaze Data gt Settings gt Opacity 3 Click and drag the Opacity slider to change the Gaze Point Opacity level 4 The new opacity level is now applied during replay To change Gaze Point Size Make sure the correct Replay tab is active In the Tools panel on the right locate Gaze Data gt Settings gt Size Click and drag the Size slider to change the Gaze Point Size ON The new size is now applied during replay 4 3 3 Managing and logging Custom Events in a recording Tools for logging interesting and important events in the recordings are included in the software These Custom Events for ex ample Participant picks up item 1 can also be exported together with all the other data collected during a recording The logged events appear on th
85. tric is in a separate spreadsheet with each snapshot or Analysis Set having its own table in the spread sheet The tables produced by the Metrics Export contains the following information for each snapshot Snapshot Analysis Set name Metric name AOI Name one Average Median Count or Sum Total Recording column for Duration each AOI Recording name Value Value Value Value Value one row for each recording Average Value Value Value Value Value Count or fixated Value Value Value Value Value The columns and rows included in the exported table will vary slightly depending on which metric has been exported 4 8 2 Exporting Data From the Data Export tab you can export all the raw data collected by the eye tracker as well as all data generated by the user such as events that have been logged in the recordings Exports from Data Export are saved in a tab separated values file tsv and follows the Unicode standard To export data 1 Select Data Export in the Dashboard Menu A Data Export tab opens Select the data types you want to include in the tsv file Click the Export button on the top right A Windows File Manager dialog box opens In the file manager dialog box locate the folder you want to save the file in In the File name field enter a file name for your file Click Save to save the export file named tsv 2 3 4 5 6 In the current version of Tobi Pro Glasses Analyze
86. u will find the main menu and a list of all available recordings in you project on the Dashboard EPPA Recordings List The Recordings List is the main content on the Dashboard and it contains useful information about recordings available in the current project Details displayed in the Recordings List include Recording ID of the recording Participant ID of the participant Duration The duration of the recording down to the millisecond Date Shows the time and date when the recording was performed Gaze Samples The percentage is calculated by dividing the number of eye tracking samples that were correctly identi fied by the theoretical maximum which for Tobii Pro Glasses 2 would be 50 samples second 100 means that a 2D gaze point was calculated throughout the recording it is unlikely to achieve a Gaze Sample percentage of 100 during an extended recording due to the fact that blinking takes up approximately 5 10 of the time 50 means that the eye tracker was able to determine the 2D gaze point in 50 of the samples Eyes cannot be found when a person is blinking there is a source of infrared light interference such as the sun or they are looking at very high gaze angles this will result in a lower Gaze Sample percentage H Tobii Pro Glasses 2 uses the point of convergence for the left and right eyes gaze vectors to calculate the dis tance Z at which the participant is focusing and map the gaze to the scene ca
87. ulated to reflect the human visual field i e the fact that the human eye has the highest visual acuity at the fovea and that the acuity decreases as we move away from this spot on the retina For example when we focus on a word in a text we are able to read the word and its immediate neighbors but not words a few centimeters away 40 Appendix C How heat maps are calculated Tobii Pro Glasses Analyzer User s manual v 1 25 en US Since the kernel is set in pixels Tobii heat maps are dependent on screen or scene camera video resolution and less representative of the individual s foveal vision if the participant varies his distance greatly to the stimulus Tobii heat map calculations using fixation count for Absolute and Relative duration the calculations are the same However instead of using the number of fixations as values we use the fixation duration or fixation duration media viewing time respectively Heatmap Count count max value is set to 1 Threshold 2 x location in pixels Tobi Pro Glasses Analyzer User s manual v 1 25 en US Appendix C How heat maps are calculated 41 Appendix D Limitations All systems have properties that need to be considered and limitations that need to be taken into account The following section present most of these limitations D1 Snapshots Requirements for snapshot image files Less than 25 megapixels PNG or JPG file format Snapshots created from multiple stitched ima
88. ves you the freedom to work on multiple recordings map data onto several snap shots and create several visualizations in parallel Multiple tabs can be open simultaneously but only one tab can be active at any time 4 1 Managing projects in Tobii Pro Glasses Analyzer Tobii Pro Glasses Analyzer organizes and stores data in projects which makes it easy to keep track of recordings and partici pants Each project can contain numerous recordings participants snapshots mapped data and events etc The projects are managed from the Applications menu To open the Applications menu Click the icon at the top left of the Tobi Pro Glasses Analyzer window 4 1 1 Creating a new project To create a new project 1 If the Applications menu is not already open click the icon at the top left of the Tobi Pro Glasses Analyzer window to open the Applications menu Click Create new project in Applications menu Enter a name for the project in the Project name field To change the default location of the project files click Browse and choose a new folder The default location is user Documents Tobii Pro Glasses Analyzer 5 Click Create to create the new project An empty Project Dashboard will open 4 1 2 Opening an existing project To open an existing project 1 If the Applications menu is not already open click the icon at the top left of the Tobii Pro Glasses Analyzer window to open the Applications menu Click Open project in t
89. ving Average All measurement systems including eye trackers experience noise Noise can come from imperfections in the system setup as well as from influences and interferences from the environment in which the measurement takes place In eye tracking research where the fixation is the eye movement of interest other minor eye movements such as tremor and microsaccades Yarbus 1967 can also be seen as noise In the most basic form I VT filters calculate the velocity by multiplying the change in position between two consecutive sample points If the sampling interval is long the eye will have time to do quite large shifts of direction between two samples which makes it easy for the eye tracker to distinguish between real eye movements and noise The higher the sampling frequency the smaller the eye movement will be between two consecutive samples at a given eye velocity Noise will therefore have a greater impact in a high frequency system even though it has the same magnitude as in a low frequency system The Moving Average noise reduction function is accessible using the Tobii I VT fixation filter and the Raw data filter The Moving Average noise reduction function is a symmetric moving average filter It produces output data by creating an arithmetic mean of a number of data points from the input data The number of input data points used to produce each output point is controlled by the Window size parameter Each produced output data point is giv
90. wn menu To redo the most recent undone action Click the Redo button on the toolbar or press Ctrl Y To redo a number of recent undone actions 1 On the toolbar click the dropdown arrow next the Redo button 2 Select the actions you want to redo in the dropdown menu 4 5 7 Copying cutting and pasting AOls An AOI can be copied or cut from one snapshot and pasted onto another snapshot To copy or cut and paste the shape of an AOI 1 Select the Select Move AOI tool on the toolbar 2 Right click the AOI that you want to cut or copy and choose Copy or Cut from the menu You can do this by right click ing either the AOI shape on the snapshot or the AOI name in the Areas of Interest list 3 To paste the AOI do one of the following Tobi Pro Glasses Analyzer User s manual v 1 25 en US 4 Basic operations in Tobii Pro Glasses Analyzer 17 To paste the AOI in the middle of the snapshot right click on the snapshot and choose Paste To paste the AOI in the same location where the copied AOI was right click on the snapshot and click Paste in Place i The fastest way to duplicate an AOI is to press and hold CTRL while you drag the AOI that you want to duplicate to a new location You can also copy and paste AOls by using the Edit menu on the toolbar or by using the keyboard shortcuts CTRL C to copy or CTRL X to cut and CTRL V to paste 4 5 8 Showing Hiding AOls AOls can be hidden not visible or shown visible To hi
91. yzer Imported data is stored and organized in projects to make it easy to keep track of recordings and participants Tobii Pro Glasses 2 data is the total collection of data stored by the Tobii Pro Glasses 2 Recording Unit on the SD memory card This data includes recording date participant names video etc Gaze data is the data that describes where the participant was looking during a recording Gaze data is a part of Tobii Pro Glasses 2 data Snapshots are still images of environments and objects of interest in the environment Mapping of data onto snapshots makes data aggregation easier Snapshots are typically created by the person doing research using a digital camera Fixations filter or Gaze filter is a data classification algorithm that translates gaze data into eye movements such as fixations and saccades Heat map is a gaze data visualization on top of a snapshot image that uses colors to represent how much the participants gazed on attended to different areas of an object or an environment Gaze plot is a visualization which shows the sequence and position of fixations dots on a Snapshot image The size of the dots indicates the fixation duration unless the same size setting has been selected in which case all the gaze plot points will be the same size and the numbers in the dots represent the order of the fixations AOI is short for Areas of Interest AOls are drawn onto snapshots to enable numerical statistical analysis base

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