Picture Quality Analysis System
Contents
1. 500 NA Typical NA Motion and DMOS Units Re Broadcast ADMOS CRT Foreground BT 500 Training a N ormtinant SD Talking Head 014 SD Talking Head SD Broadcast ITU R BT 500 NA Typical NA Skin and DMOS Units Re Broadcast ADMOS CRT Foreground BT 500 Training S a Repurposing Reference and Test are Independent Use Any Combination Display Model and Viewing Conditions with Each Measurement Above Format Conversion 015 SD DVD from DMD Projector 7 scrn heights NA Expert NA NA DMOS Units Re Cinema to SD DVD D Cinema DMOS andSD CRT 20 cd m and BT 500 Training ITU R BT 500 Format Conversion 016 CIF from SD LCD and CRT ITU R BT 500 NA Expert NA NA DMOS Units Re SD to CIF Broadcast DMOS SD Broadcast and 7 scrn heights BT 500 Training 20 cd m Format Conversion 017 SD from SDandCRT MTU R BT 500 NA Expert NA NA DMOS Units Re HD to SD HD Broadcast DMOS HD Broadcast BT 500 Training Format Conversion 017 A SD from SD and HD ITU R BT 500 NA Expert NA NA DMOS Units Re SD to HD HD Broadcast DMOS Progressive CRT BT 500 Training Format Conversion 018 QCIF from CIF QCIF and 7 scm heights NA Expert NA NA DMOS Units Re CIF to QCIF and QVGA DMOS CIF QVGA LCD 20 cd m BT 500 Training PQA500 www tektronix com products video test 9 Picture Quality Analysis System gt PQA500 gt Pre configured Measurement Set continued Measurement Measurement Configuration Nodes Class Name Display2. In the example below Reference E is a scene from one of the VClips library files The image Test F has been passed through a compression system which has degraded the resultant image In this case the background of the jogger in Test F is blurred compared to the Reference image E A PSNR measurement is made on the PQA500 of the difference between the Reference and Test clip and the highlighted white areas of PSNR Map G shows the areas of greatest difference between H Perceptual Difference Map for DMOS the onginal and degraded image Another measurement is then made by the PQA500 this time using the Predicted DMOS algorithm and the resultant Perceptual Difference Map for DMOS H image is shown It shows the greater perceptual difference with the highlighted white area Using the human vision model of the PQA500 you can observe the areas of the image which the eye will observe as degraded In this case the jogger in the image is not as noticeably degraded as the PSNR would have indicated 4 PQA500 www tektronix com products video test Attention Map Example The J ogger is Highlighted Attention Model The PQA500 also incorporates a new Attention Model to support the predicted human focus of attention This model considers gt The Motion of Objects gt Identifies People by Skin Detection gt Location gt Contrast gt Shape Size gt The Distraction of Noticeable Artifacts These
3. analog transmission degradation data errors Slow display response times frame rate reduction for mobile transmission and videophone teleconferencing and more can all be evaluated separately or in any combination How It Works The PQA500 takes two video files as inputs a reference video sequence and a compressed impaired or processed version of the reference First the PQA500 performs a spatial and temporal alignment between the two sequences without the need for a cali bration stripe embedded within the video sequence Then the PQA500 analyzes the quality of the test video using measurements based on the human vision system and attention models and then outputs quality meas urements that are highly correlated with Subjective assessments The results include overall quality summary metrics frame by frame measurement metrics and an impairment map for each frame The PQA500 also provides traditional picture quality measures such as PSNR peak signal to noise ratio as an industry benchmark impairment diag nosis tool for measuring typical video impairments and detecting artifacts Each reference video sequence and test clip can have different resolutions and frame rates The PQA500 can provide picture quality measurement between HD vs SD SD vs CIF or any combination This capability supports a vanety of repurposing applications such as format conversion DVD authoring IP broadcasting and semiconductor design Th
4. generate SDI video from files in the following formats all formats are 8 bit yuv UYVY YUY2 gt rgb BGR24 P avi uncompressed BGR24 UYVY YUY2 P vcap created by PQA500 video capture Picture Quality Analysis System gt PQA500 P Generation Capture Supported File Formats for measurement All formats support 8 bit only yuv UYVY YUY2 YUV4 4 4 YUV4 2 0_ planar gt rgb BGR24 GBR24 gt avi uncompressed BGR24 UYVY YUY2 gt ARIB ITE format 4 2 0 planar with 3 separate files yyy bbb rrr P vcap created by PQA500 video capture Supported Frame Geometry Supported Format by SD HD SDI Interface SD SDI 720x486 720x576 HD SDI 1280x720 1920x1080 5251 59 94 6251 50 720P50 720P59 94 720P60 1080i 50 1080i 59 94 10801 60 1080p 23 98 1080p 24 1080p 25 1080p 29 97 1080p 30 gt Pre installed Video Sequences Vclips 1920x1088 YUV4 2 0 planar V031202 Eigth Ave V031255 TimeSquare V031251 Stripy jogger 1920x1080 UYVY V031251 Stripy jogger 1280x720 UYVY YUV4 2 0 planar V031002 Eigth Ave V031055 TimeSquare V031051 Stripy jogger with 3 10 26 Mbps 864x486 YUV4 2 0 planar Converted V031051 Stripy jogger with 2 4 7 Mbps 320x180 YUV4 2 0 planar Converted V031051 Stripy jogger with 1000 1780 2850 kbps PQA300 without Trigger 720x486 UYVY Ferris Flower Tennis Cheer with 2 Mbps 25 fps 720x576 PQA300 with Trigger UYVY Auto BBC Ski Soccer 720x486 UYVY Mobi
5. B with 2 port Hub 119 7083 00 Application Recovery Disk 020 2902 XX Video Sequences Recovery Media 020 1901 XX Tool less Rail Kit 016 1995 00 Options SDI SD HD SDI Interface International Power Plugs AO North America Al Universal EURO A2 United Kingdom A3 Australia A4 240v North America A5 Switzerland A6 J apan A10 China All India A99 No Power Cord or AC Adapter Language Options LO English Manual L5 apanese Manual L7 Simple Chinese Manuals Service R3 Repair Service 3 Years including warranty R5 Repair Service 5 Years including warranty Post Sale Upgrade PQA5UP Field Upgrade Kit for PQA500 Option SDI SD HD SDI Interface for Field Installation Extended Service Offerings CA1 Single Calibration R1PW Repair Service 1 year Post Warranty R2PW Repair Service 2 year Post Warranty R3DW Repair Service 3 year Includes Warranty R5DW Repair Service 5 year Includes Warranty Additional Information Please contact your local Service Manager for information regarding our products and services or contact us at www tektronix com serviceand Supportcontactus PQA500 www tektronix com products video test 11 Picture Quality Analysis System Contact Tektronix gt PQA500 ASEAN Australasia 65 6356 3900 Austria 41 52 675 3777 Balkans Israel South Africa and other ISE Countries 41 52 675 3777 Belgium 07 81 60166 B
6. Picture Quality Analysis System gt PQA500 Se aires a oooeenaa a E OR Picture Quality Analysis System The PQA500 Is the latest generation Picture Quality Analyzer built on Tektronix Emmy Award winning PQA200 300 Based on the concepts of the human vision system the PQA500 provides a suite of repeatable objective quality measurements that closely correspond with subjective human visual assessment These meas urements provide valuable information to engineers working to optimize video compression and recovery and main taining a level of common carrier and distribution transmission service to Clients and viewers Compressed Video Requires New Test Methods The true measure of any television system Is viewer satisfaction While the quality of analog and full bandwidth digital video can be characterized indi rectly by measuring the distortions of Static test signals compressed televi Sion systems pose a far more difficult challenge Picture Quality in a compressed system can change dynamically based on a combination of data rate picture complexity and the encoding algorithm employed The Static nature of test signals does not provide true charactenzation of picture quality A test scene with natural content and motion can be used with human viewers reporting the results but this method of evaluating the capa bilities of a compressed video system is inefficient and not very objective Subjective testi
7. View PSNR Perceptual Artifact Attention Summary M odel M odel Difference Detection M odel Node Attention a Attention 019 Stand alone Attention Model NA NA NA NA NA Default Map units Weightings Probability of focus of attention Objective Measurements Full Reference General Difference PSNR 020 PSNR dB NA Auto align spatial Selected NA NA NA dB units Artifact Measurement Removed Edges 021 Removed Edges Percent NA NA NA NA Blurring NA Added Edges 022 Added Edges Percent NA NA NA NA Ringing M osquito NA Noise Rotated Edges 023 Rotated Edges Percent NA NA NA NA Edge Blockiness NA of original 024 DC Blocking Percent NA NA NA NA DC Blockiness NA deviation from block DC Artifact Classified Filtered PSNR Removed Edges 025 Removed Edges NA NA Selected NA Blurring NA dB units Weighted PSNR dB Added Edges 026 Added Edges NA NA Selected NA Ringing Mosquito NA dB units Weighted PSNR dB Noise Rotated Edges 027 Rotated Edges NA NA Selected NA Edge Blockiness NA dB units Weighted PSNR dB of original 028 DC Blocking NA NA Selected NA DC Blockiness NA dB units deviation from Weighted PSNR dB block DC ee Artifact Annoyance Weighted Filtered PSNR PSNR with default 029 Artifact Annoyance NA NA Selected NA All artifacts NA dB units artifact annoyance Weighted PSNR dB selected weights ____________ E ___ C Repurposing Use View Model to Resample Shift a
8. ard parameters and perceptual summation metrics for each frame and over all frames are provided Summary measure results are displayed as data lists maps or graphs with a bar chart during video playback Error logging and alarms are available to help users efficiently track down the Cause of video quality problems The logging parameters are gt Registration information found in automatic temporal and spatial alignment cropping scale shift in horizontal and vertical Y gain and DC offset gt Alignment confidence cross correlation coefficient 1 0 is perfect match gt Logs of when measurement values per frame exceed either warning or error levels config urable by user via the summary node All results data and graphs can be recalled to the display for critical examination 6 PQA500 www tektronix com products video _test P Statistical Graph P Auto Spatial and Temporal Alignment Between CIF vs HD Pictures Automatic Temporal Spatial Alignment The PQA500 supports automatic temporal and spatial alignment as well as manual alignment The automatic spatial alignment can measure the cropping scale and shift in each dimension even across different resolutions for example by aligning SD to HD video If extra blanking is present within the standard active region it is measured as crop ping when this function is enabled The automatic spatial and temporal alignment allows the picture
9. attention parameters can be customized to give greater or less importance to each function This allows each measurement using the attention model to be user configurable The model is especially useful to eval uate the video process tuned to the specific application For example if the content is sports programming the viewer is expected to have higher attention in limited regional areas of the scene Highlighted areas within the attention image map will show the areas of the image drawing the attention of the eye Artifact Detection Artifact Detection reports a variety of different changes to the edges of the image gt Loss of edges or blurring gt Addition of edges or ringing mosquito noise gt Rotation of edges to vertical and horizontal or edge blockiness gt Loss of edges within an image block or DC blockiness They work as weighting parameters for Subjective and objective measurements with any combination The results of these different measurement combina tions can help to improve picture quality through the system For example artifact detection can help answer questions such as Will the DMOS be improved with more de blocking filtering or Should less pre filtering be used If edge blocking weighted DMOS is much greater than blurring weighted DMOS the edge blocking is the domi nant artifact and perhaps more de blocking filtering should be considered In some applications it may be
10. e PQA500 can also support measurement clips with unlimited Sequence duration allowing a full length movie to be quantified for picture quality through varous conversion processes 2 PQA500 www tektronix com products video test Prediction of Human Vision Perception PQA500 measurements are developed from the human vision system model and additional algorithms have been added to improve upon the model used in the PQA200 300 This new extended technology allows legacy PQR measurements for SD while enabling predictions of subjective quality rating of video for a variety of video formats HD SD CIF etc It takes into consideration different display types used to view the video for example interlaced or progressive and CRT or LCD and different viewing conditions for example room lighting and viewing distance A model of the human vision system has been developed to predict the macro behavioral response to light Stimulus with the following varying parameters gt Contrast including supra threshold gt Mean Luminance gt Spatial Frequency gt Temporal Frequency gt Angular Extent gt Temporal Extent gt Surround gt Eccentricity gt Orientation gt Adaptation effects This model has been calibrated over the appropriate combinations of ranges for these parameters with reference Stimulus response data from vision science research As a result of this Calibration the model p
11. eference or No reference Picture Quality gt Peak Signal to Noise Ratio PSNR Full reference gt Focus of Attention Applied to Both Full reference and No reference Measurements gt Artifact Detection Full reference Except for DC Blockiness gt DC Blockiness Full reference and No reference Picture Quality Analysis System gt PQA500 Conligure beaure Borers Tego Set Gii Sieger aie CE nee ik COT S00 Bika PIR TE H ira FN G0 GF and CFA PP Ce HEMA POR ER SD Diese CL CO OOF red ete Car LEN DHL ey GHR tg Pem A Plenn ak E E rr ar ia eel Dias He LID Precio Deadia SO iiy CAT deploys fi e serene human vee pies oe E weer Gielen oF conan hahi ere ee eB aa ee ae el Tes F Preinan Spano A TAA o c j Heke P Configure Measure Dialog P Edit Measure Dialog The PQA500 supports these measure ments through preset and user defined combinations of display type viewing conditions human vision response demographic focus of attention and artifact detection in addition to the default ITU BT 500 conditions The user configurable conditions capability helps to optimize CODEC parameters to be appropnate to the specific appli cation and investigate what condition affects the picture quality measurement results by comparing the results under several measurement conditions The user defined measurement condition is set up by modifying pre configured measurement sets or creati
12. fits Vclips are a diverse set of short video Clips designed to test video encoders and decoders to the limits of their abilities gt Video Sizes Test with many different video sizes Sub QCIF QCIF CIF D1 HD 720p and 1080i gt Difficult Subjects Test with fine detail night time areas of high contrast sharp borders uniform areas bright and dull colors gt Visual Objects People buildings vehicles trees landscapes clouds water and synthetic objects gt Movement Fast slow uniform random multiple moving objects Also pan zoom and rotate gt Test Card Sequences Precisely defined motion bright colors dull colors lines patterns and grids Also strobing and white noise 8 PQA500 www tektronix com products video test Picture Quality Analysis System gt PQA500 gt Characteristics Pre configured Measurement Set Measurement Measurement Configuration Nodes Class Name Display View PSNR Perceptual Artifact Attention Summary Model Model Difference Detection Model Node View Video With 000 View Video NA NA NA NA NA NA NA No Measurement Subjective Prediction Full Reference Noticeable Differences SD Display 001 SD Broadcast PQR SD Broadcast ITU R BT 500 NA Typical NA NA PQR Units and Viewing CRT HD Display 002 HD Broadcast PQR HD Broadcast ITU R BT 500 NA Typical NA NA PQR Units and Viewing CRT CIF Display 003 CIF and QVGA PQR CIF QVGA 7scrn height
13. ight 2008 Tektronix All rights reserved Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supersedes that in all previously published material Specification and price change privileges reserved TEKTRONIX and TEK are registered trademarks of Tektronix Inc All other trade names referenced are the service marks trademarks or registered trademarks of their respective companies 05 08 HB WOW 25W 20585 3 Tektronix S
14. known that added edges such as ringing and mosquito noise are more objectionable than the other artifacts These weight ings can be customized by the user and configured for the application to reflect this viewer s preference thus improving DMOS prediction Likewise PSNR can be measured with these artifact weightings to determine how much of the error contributing to the PSNR measurement comes from each artifact Hee ee Cs huf PLD Tig Ble rita hel Litke Wegig g m lar fdger Mkaring GO i Madde Edger rg LJ i X Faime Epes Ebel Prhe correc ory dala OC et ret Sak et Engi Wim H m EDE piisi GYEN A A wr ee o Artifact Detection Settings The Attention Model and Artifact Detection can also be used in conjunction with any combination of Predicted subjective or Objective measurements This allows for example evaluation of how much of a particular noticeable artifact will be seen where a viewer is most likely to look Comprehensive Picture Quality Analysis The PQA500 provides full reference FR comparison between test and reference quality measurements and no reference NR measurements on the luminance signal Reduced refer ence RR measurements can be made manually from differences in no refer ence measurements The suite of measurements includes P Critical Viewing Human Vision System Model based Full reference Picture Quality gt Casual Viewing Attention Weighted Full r
15. le with 3 6 9 Mbps 720x576 UYVY Mobile with 3 6 9 Mbps PQA500 www tektronix com products video test 7 Picture Quality Analysis System gt PQA500 Related Products Recent updates and more details are available in each data sheet MTS4EA Elementary Stream Analysis Software for VC 1 H 264 AVC MPEG 2 MPEG 4 H 263 and 3GPP Standards i Ten 4 If i IER t bi it AERES all desis naee Features amp Benefits gt Next Generation VC 1 H 264 AVC MPEG 4 and 3GPP and Legacy MPEG 2 and H 263 CODEC Support gt Frame by Frame and Block by Block Analysis to Allow Easy CODEC Comparison gt Easy to Interpret Detailed Graphical Displays Requires User Installed Microsoft Excel gt Comprehensive Semantic Trace File Output to Determine Block by Block Encoder Decision Making gt AV Delay Measurement option gt Audio Decode and Analysis option gt Synchronized Audio and Video Analysis gt Real time and Non Real Time Decoding and Analysis of Compressed Video Streams Dependent on PC Performance P BitStream Editing gt Batch Mode to Allow Automated Testing gt YUV Decoded Video Output for Baseband Video Analysis and Picture Quality Analysis gt Extraction of Elementary Stream from Transport Stream P Available as Single user Local License for PC and Tektronix Instruments or Server Based Floating License Vclips for Video Testing and Evaluation Features amp Bene
16. matic or manual control of image cropping and test image contrast ac gain brightness dc offset horizontal and vertical scale and shift PSNR No configurable parameters Perceptual Difference The viewer characteristics acuity sensitivity to changes in average brightness response speed to the moving object sensitivity to photosensitive epilepsy triggers etc Attention Model Overall attention weighting for measures Temporal motion Spatial center people skin foreground contrast color shape size Distractions differences Artifact Detect Removed detail within a block Summary Node Added Edges Blurring Removed Edges Ringing Mosquito Noise Rotated Edges Edge Blockiness and DC Blockiness Measurement Units Subjective Predicted DMOS PQR or Perceptual Contrast Objective Mean Abs LSB dB Map type Signed on gray or unsigned on black Worst Case Training Sequence for ITU R BT 500 Training Default or User application tuned Determined via Worst Case Video Perceptual Contrast Error log threshold Save mode Computer System and Peripherals Operating System Windows XP CPU Intel Xeon Dual Core 3GHz processor Hard Disk Drive 6x 3 5 SATA Front panel removable hard disk drive CD R W Drive Front panel CD R W drive DVD Drive Read only Input Output Ports Power 100 to 240V 50 60 Hz Keyboard Port PS 2 compatible Mouse Port PS 2 compatible USB 2 0 Port One front pa
17. nd Crop Test to Map to Reference Format Conversion 030 SD DVD from D Cinema NA Auto align spatial Selected NA All artifacts NA dB units Cinema to SD DVD Artifact weighted PSNR dB selected Format Conversion 031 CIF from SD Broadcast NA Auto align spatial Selected NA All artifacts NA dB units SD to CIF Artifact weighted PSNR dB Selected Format Conversion 032 SD from HD Broadcast NA Auto align spatial Selected NA All artifacts NA dB units HD to SD Artifact weighted PSNR dB selected Format Conversion 033 QCIF from CIF and QVGA NA Auto align spatial Selected NA All artifacts NA dB units CIF to QCIF Artifact weighted PSNR dB selected Attention Weighted Objective Measurements General Difference PSNR 034 Attention Weighted NA NA Selected NA NA Default dB units PSNR dB Weightings Objective Measurements No Reference Artifact a M aAa DC Blockiness 035 No Reference NA NA NA NA No reference NA DC Blockiness DC Blockiness Percent DC Block 10 PQA500 e www tektronix com products video_test Picture Quality Analysis System gt PQA500 gt Nodes Node Name Configurable Parameter Display Model Display technology CRT LCD DMD each with preset and user configurable parameters Interlace Progressive Gamma Response time etc Reference Display and Test Display can be set independently View Model Viewing distance Ambient Luminance for Reference and Test independently image cropping and registration auto
18. nel Two rear panel LAN Port Two RJ 45 connector supports 10 100 1000Base T DVI Port DVI female connector x2 Dual link DVI I Up to 2560x1600 60 Hz SDI 10 Port Option SDI 2ch Input 2ch Output with BNC to mini BNC SDI cable 174 5466 xx Physical Characteristics gt Benchtop Configuration Dimensions mm in Height 88 9 31 2 Width includes 487 1 19 1 8 rack ears Depth include front 776 2 30 5 6 panel rea power supply latch handles Weight kg los Net 39 86 Shipping 4 103 gt Ordering Information PQA500 Picture Quality Analysis System PC Monitor Requirement Note PQA500 does not include a PC monitor A monitor is to be provided by the user gt Dual link DVI ports gt Up to 2560x1600 resolution Standard Accessories PQA500 Picture Quality Analysis System Documentation Quick Start User Manual in English and Simplified Chinese or J apanese translation if a language option was ordered 071 2256 XxX English Release Notes 071 2259 XxX User Technical Reference 071 2263 XX Measurement Technical Reference 071 2260 XX Specification and Performance Verification Manual in PDF format on Documentation CD 071 2264 XX Measurement Declassification and Security Instructions 071 2266 XX Documentation CD containing PDF files of the documentation set 063 4065 XxX Other Microsoft Optical Mouse black with scroll wheel USB and PS2 119 7054 00 Mini keyboard US
19. ng a new one then saving and recalling the user defined measurement set selected from the Configure Measure dialog menu PQA500 www tektronix com products video test 5 Picture Quality Analysis System gt PQA500 Easy to Use Interface The PQA500 has two modes meas urement and review The measurement mode is used to execute the measure ment selected in the Configure Dialog During measurement execution the Summary data and map results are displayed on screen and saved to the system hard disk The review mode is used to view previously saved summary results and maps created either with the measurement mode or XML script execution The user can choose multiple results in this mode and compare each result side by side using the synchronous display in Tile Mode Comparing multiple results maps made with the different CODEC parameters and or different measurement configu rations enables easy investigation of the root cause of any difference Multiple Result Display Resultant maps can be displayed synchronously with the reference and test video in a tiled or overlaid display Individual videos can also be viewed at full resolution one at a time to accom modate resolutions greater than what the tiled display can accommodate In Overlay Display the user can control the mixing ratio with the fader bar enabling co location of difference map reference and impairments in test video Sequences Summary measures of stand
20. ng with human viewers is impractical for CODEC design and operational quality evaluation The PQA500 provides a fast practical repeatable and objective measurement alternative to subjective evaluation of picture quality Human viewer testing has been tradi tionally conducted as described in ITU R Rec BT 500 11 A test scene with natural content and motion is displayed in a tightly controlled environment with human viewers expressing their opinion of picture quality to create a Differential Mean Opinion Score or DMOS Extensive testing using this method can be refined to yield a consistent Subjective rating However this method of evaluating the capabilities of a compressed video system can be ineffi cient taking several weeks to months to perform the experiments This test methodology can be extremely expen Sive to complete and often the results are not repeatable Thus subjective DMOS testing with human viewers is impractical for the CODEC design phase and inefficient for ongoing opera tional quality evaluation The PQA500 provides a fast practical repeatable and objective measurement alternative to the subjective DMOS evaluation of picture quality gt Features amp Benefits Fast accurate repeatable and objective picture quality measurement Predicts DMOS differential mean Opinion score measurement based on human vision system model Picture quality measurements can be made on a variety of HD video fo
21. quality measurement to be made among different resolutions and frame rates 1 a m H E ToT Bnn M P Result File Sample Automation Test with XML Scripting In the CODEC debugging optimizing process the designer can repeat several measurement routines as CODEC parameters are revised Automated regression testing with XML Scripting can ease the restrictions of manual operation by allowing the user to write a series of measurement Sequences within an XML script Measurement results of the script oper ation can be viewed by using either the PQA500 user interface or any spread sheet application that is able to read the created csv file format as a Summary Up to four scnpts can be executed simultaneously for faster measurement results Optional SD HD SDI Interface An optional SD HD SDI interface enables both generation and capture of SDI video signals including simulta neous generation and capture This allows the user to playout the reference video clips directly from the PQA500 into the device under test The test output from the device can then be simultaneously captured by the PQA500 This saves the user from having to use an external video source to apply any required video input to the device under test With this gener ation capability files created by video editing software can be directly used as reference and test sequences for picture quality measurements The SD HD SDI video option can
22. razil amp South America 11 40669400 Canada 1 800 661 5625 Central East Europe Ukraine and the Baltics 41 52 675 3777 Central Europe amp Greece 41 52 675 3777 Denmark 45 80 88 1401 Finland 41 52 675 3777 France 33 0 1 69 86 81 81 Germany 49 221 94 77 400 Hong Kong 852 2585 6688 India 91 80 22275577 Italy 39 02 25086 1 Japan 81 3 6714 3010 Luxembourg 44 0 1344 392400 Mexico Central America amp Caribbean 52 55 5424700 Middle East Asia and North Africa 41 52 675 3777 The Netherlands 090 02 021797 Norway 800 16098 People s Republic of China 86 10 6235 1230 Poland 41 52 675 3777 Portugal 80 08 12370 Republic of Korea 82 2 6917 5000 Russia amp CIS 7 495 7484900 South Africa 27 11 206 8360 Spain 34 901 988 054 Sweden 020 08 80371 Switzerland 41 52 675 3777 Taiwan 886 2 2722 9622 United Kingdom amp Eire 44 0 1344 392400 USA 1 800 426 2200 For other areas contact Tektronix Inc at 1 503 627 7111 Updated 12 November 2007 For Further Information Tektronix maintains a comprehensive constantly expanding collection of application notes technical briefs and other resources to help engineers working on the cutting edge of technology Please visit www tektronix com CE acc sy ane i Product s are manufactured in ISO registered facilities Product s complies with IEEE Standard 488 1 1987 RS 232 C and with Tektronix Standard Codes and Formats Copyr
23. rmats 1080i 720p and SD video formats 525 or 625 Makes picture quality comparison across different resolutions from HD to SD or HD SD to CIF User configurable viewing condition and display models for reference and comparison Attention artifact weighted measurement Automatic temporal and Spatial alignment Easy regression testing and automation with XML scripting Multiple results view options Optional SD HD SDI interface for generating capturing video Pre installed sample reference and test sequences Applications CODEC design optimization and verification Conformance testing transmission equipment and system evaluation Digital video mastering Video compression services Digital consumer product development and manufacturing Tektronix Picture Quality Analysis System gt PQA500 Ul Top Image of PQA500 System Evaluation The PQA500 can be used for installa tion verification and trouble shooting of each block of the video system because tt is video technology agnostic any visible differences between video input and output from processing components in the system chain can be quantified and assessed for video quality degradation Not only can CODEC technologies be assessed in a system but any process that has potential for visible differences can also be assessed For example digital transmission errors format conversion e 10801 to 480p in set top box conversions 3 2 pull down
24. rovides a highly accurate prediction pees FE Eisd ji i Sa ii AT BiP S T E E E E E N Seana P A Modulation Sensitivity vs Temporal Frequency P B Modulation Sensitivity vs Spatial Frequency The following graphs are examples of scientific data regarding human vision characteristics used to calibrate human vision system modeling in the PQA500 Graph A shows modulation sensitivity vs temporal frequency and graph B shows modulation sensitivity vs spatial frequency The use of over 1 400 call bration points supports high accuracy measurement results Picture Quality Analysis System gt PQA500 D Perceptual Contrast Map The following picture C is a single frame from the reference sequence of a moving Sequence and picture D is the percep tual contrast map calculated by the PQA500 The perceptual contrast map shows how the viewer perceives the reference sequence The blurring on the background is caused by temporal masking due to camera panning and the black area around the jogger shows the masking effect by the high contrast between the background and the jogger The PQA500 creates the perceptual map for both reference and test sequences then makes a percep tual difference map from them PQA500 www tektronix com products video test 3 Picture Quality Analysis System gt PQA500 G PSNR Map gt F Test Comparison of Predicted DMOS with PSNR
25. s NA Typical NA NA PQR Units and Viewing LCD 20 cd m D CINEMA 004 D CINEMA PQR DMD Projector 3 scm heights NA Typical NA NA PQR Units Projector 1 cd m and Viewing Subjective Rating Predictions SD Display 005 SD Broadcast DMOS SD Broadcast ITU R BT 500 NA Typical NA NA DMOS Units Re and Viewing CRT BT 500 Training HD Display 006 HD Broadcast DM OS HD Broadcast ITU R BT 500 NA Typical NA NA DMOS Units Re and Viewing CRT BT 500 Training CIF Display 007 CIF and QVGA DMOS CIF QVGA 7 scrn heights NA Typical NA NA DMOS Units Re and Viewing LCD 20 cd m BT 500 Training D CINEMA 008 D CINEMA DMOS DMD Projector 3 scrn heights NA Typical NA NA DMOS Units Re Projector 1 cd m BT 500 Training and Viewing Attention Biased Subjective Rating Predictions SD Display 009 SD Broadcast ADMOS SD Broadcast ITU R BT 500 NA Typical NA Default DMOS Units Re and Viewing CRT Weightings BT 500 Training HD Display 010 HD Broadcast ADMOS HD Broadcast ITU R BT 500 NA Typical NA Default DMOS Units Re and Viewing CRT Weightings BT 500 Training CIF Display 011 CIF and QVGA ADMOS CIF QVGA 7 scrn heights NA Typical NA Default DMOS Units Re and Viewing LCD 20 cd m Weightings BT 500 Training SD Sports 012 SD Sports SD Broadcast ITU R BT 500 NA Typical NA Motion and DMOS Units Re Broadcast ADMOS CRT Foreground BT 500 Training a A A A a HD Sports 013 HD Sports HD Broadcast ITU R BT
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