VQMA-2 User Manual, version 2.4.3 May 2009
Contents
1. Vertical scale is D1 8 bit Reference Black 16 Reference White 2235 Horizontal co ordinate Y pixel count from 0 to 719 Note that VOMA measures black and white levels not on porches of staircase signal 4th band grey scale but on larger black and white bars available within 5th band of the test pattern pulse and bar This makes measurement more accurate but actual vertical position of black or white porch of staircase waveform display may occasionally look slightly different from measured levels 2005 2009 by VideoQ Inc all rights reserved 17 User Manual Running VQMA in Windows GUI mode 4 4 4 Diff Phase and Diff Gain pages These two pages display measured Differential Phase in degrees and Differential Gain in These are calculated as peak values within the whole CVBS range from black to white There are also two conventional displays of DP and DG profiles black is on the left and white is on the right The profile displays are very useful because they allow to estimate actual causes of the differential distortions For example from the plots below it is clear that there is no problem with DP whilst relatively high out of specs values of DG correlate with high signal levels close to 10096 Such shape of the profile shows that the DG distortion can be possibly reduced by minor re distribution of video gains thru the video processing chain 20 10 30 20 102. To Luminance Delay in nanoseconds e g 2 positive values show that chrominance is delayed wrt luminance CYG Chrominance To Luminance Gain in dB e g 0 11 positive values show that chrominance gain is higher than luminance gain DG Differential Gain in e g 1 21 DP Differential Phase in degrees e g 0 8 2 FR36 FR42 and 58 are the frequency response reading in dB for the burst of corresponding MHz value For NTSC version the burst frequencies are 1 0 2 0 3 0 3 58 4 2 and 5 8 MHz PAL version uses slightly different set of frequencies 2 FR4 FR48 and 58 i e 1 0 2 0 3 0 4 0 4 8 and 5 8 MHz 2005 2009 by VideoQ Inc all rights reserved 25 VQMA User Manual Running in DOS Mode Below is the sample of the test result presentation BL 10 19 05 2 13 14 PM 10 19 05 2 13 14 PM Success 2 8 96 Success WL 10 19 05 2 13 14 PM 10 19 05 2 13 14 PM Success 99 3 96 Success SNR 10 19 05 2 13 14 PM 10 19 05 2 13 14 PM Success 52 23 dB Success KR 10 19 05 2 13 14 PM 10 19 05 2 13 14 PM Success 0 94 Success CYD 10 19 05 2 13 14 PM 10 19 05 2 13 14 PM Success 2 ns Success CYG 10 19 05 2 13 14 PM 10 19 05 2 13 14 PM Success 0 11 dB Success DG 10 19 05 2 13 14 PM 10 19 05 2 13 14 PM Success 1 21 Success DP 10 19 05 2 13 14 PM 10 19 05 2 13 14 PM Success 0 8 degree Success 10 19 05 2 13 14 PM 10 19 05 2 13 14 PM
3. 30 Differential Phase 1 1 degree Differential Gain 5 76 aaah 2005 2009 by VideoQ Inc all rights reserved User Manual Running in Windows GUI mode 18 4 4 5 Frequency Response page This page shows the measured averaged peak to peak amplitudes of six frequency bursts and displays averaged luminance waveform of multi burst band of VOMA matrix pattern 3rd band Type of averaging filter can be selected via Options menu The burst amplitudes are expressed in dB wrt nominal undistorted value Third band of VOMA test pattern includes special reference bars with levels exactly matching the nominal burst amplitude The measurement algorithm check these bars first and automatically compensate for any non standard Black Level and White Level conditions In other words VOMA frequency response measurement is always accurate and correct independent of any clamping setup or gain errors in Y channel The list of burst frequencies tested by VOMA is rather short 6 frequencies represent only few points on the frequency response plot However in typical conditions frequency response shape is quite smooth Thus VOMA values measured on few frequency bursts adequately represent typical frequency response plot in total On the other hand long distant RF echoes may produce strong ripples on frequency response seriously
4. e Noise Measurement shows weighted and unweighted SNR for Y and UV channels Noise Spectrum Display Noise Pattern Display User can select any page from View menu At the first run of VOMA EXE the Summary page is selected it also can be selected by user at any time later At any time moment only one of these pages is displayed If the user selects another video file stays on the previously opened page allowing fast performance comparison of different devices or even complete systems e g made by different manufacturers This feature is also useful for adjustment or comparison of different configurations or modes e g comparing the tuner performance with CVBS input or CVBS input performance vs YPbPr input For example user may open file Device 1 AVI select Noise Measurement page review it then open another video file e g Device 2 AVI In this case stays on Noise Measurement page thus allowing quick nearly instantaneous visual comparison of interference levels and noise performances of two capture devices Even after print out of noise spectra and noise patterns VOMA will stay on Noise Measurement page until the selection by user of some other page e g Frequency Response Test results vary depending on type of averaging filter selected in the Options menu Switching the averaging filters allows to estimate the influence of noise on the actual results Current status of averaging is shown in t
5. then VOMA performs noise measurement by processing multiple lines of a single video frame instead of analysis of multiple video frames other test procedure are in this case not applicable so the corresponding menu items are disabled and shown in grey It is possible to use other test patterns e g full field 7596 color bars or modulated ramp but with limited functionality Some pages of VOMA display still can be used e g Staircase Display Page it will show any waveform found in TV lines of Band 4 of VOMA matrix pattern VOMA does not support measurement of video quality parameters on any other test pattern except the original VOMA matrix test pattern 2005 2009 by VideoQ Inc all rights reserved 5 User Manual Software Installation and General Setup Software Installation and General Setup 1 Install VQMA software as follows Create a folder on the PC hard drive for example and copy there the following files 1 VOMA EXE Main executable Note that in some versions the executable file name can be shortened to VOM EXE 2 VONTSC INI Optional customized configuration file for NTSC standard 3 VOPAL INI Optional customized configuration file for PAL SECAM standard If these two INI files are not found in the program folder then they are created automatically by VQMA EXE with the default tolerance values This happens when the video data file of the corresponding standard is opened first time e g
6. CROCE ERE ER EIE 2 CERT 6 ELE e 0 a CLEC CERES a CELE i el a 8 20 lie I LELELELELTI Pe ae E ELEC 60 50 40 30 20 10 0 10 20 30 40 50 60 U CB Chroma Cb Cr Vectors in Percent of full D1 Range 2005 2009 by VideoQ Inc all rights reserved User Manual Running in Windows GUI mode 20 4 4 7 Noise Measurement page RMS noise level of Y channel in D1 8 bit levels is shown on the very top of the page The RMS value is derived directly from incoming video data so it correlates with unfiltered SNR Y channel SNR is calculated in five variants unfiltered band limited A amp B for CVBS amp tuner inputs band limited and weighted A amp B These SNR values may be slightly affected by video calibration errors because SNR is traditionally calculated wrt nominal signal range i e assuming video gain 0 dB UV SNR is derived from 1 5 MHz band limited unweighted sum of scaled U noise and V noise Y channel filters switch automatically depending on TV standard NTSC SMPTE Unified Weighting 4 2 MHz and 6 0 MHz Band limiting PAL EBU Weighting 5 0 MHz and 6 0 MHz Band limiting Y Noise Spectral Density plots in dB MHz for unlimited and weighted noise spectra allows to see the effect of tuner frequency response and also to distinguish random noise from the co
7. VOPAL INI will be created only if necessary when PAL standard AVI file has to be processed is a copy protected program using uniquely encrypted USB dongle matched with the copy of your executable as installed This dongle must be inserted into USB port of the PC where is installed whenever the VOMA EXE is running In case of loss or damage of this USB dongle VideoQ reserve the right to revoke the license Y pores Please note that when the dongle is not connected the protected application will stop running If you purchased multiple copies of VQMA please be sure to use the dongle with the same registration number as the copy number on the distribution CD Installation on networked computer system LAN or WAN is not possible with this version 2 Connect VQMA test pattern source to the appropriate input of capture device 3 Run the appropriate capture software to create AVI recommended or YUV file with video data 4 Run VQMA program to measure the performance of the device under test Repeat steps 3 and 4 as required Removing VQMA software is quite simple VOMA does not make records in Windows system registry except the location of the last opened video data file Therefore to remove VQMA from the system it is enough to delete the executable file VOMA EXE 2005 2009 by VideoQ Inc all rights reserved User Manual Software Installation and General Setup 6 3 1 Test Pattern Files and DV
8. Video Interleaved File Format Chrominance Chroma Video Signal Comma Separated Values File Format Color Video Blanking and Sync Composite Video Signal Differential Gain Differential Phase CVBS specific distortions Digital Video Disk Disk Format European Broadcasting Union National Television Systems Committee also a TV Standard name Phase Alternate Lines TV Standard Root Mean Square Value noise strength estimate Signal To Noise Ratio Society of Motion Pictures and Television Engineers Text File Format for VQMA software purposes same as CSV Color Difference Video Signals U CB amp V CR Luminance Video Signal Digital Component 4 2 2 Multiplex also a File Format 2005 2009 by VideoQ Inc all rights reserved VideoQ Inc
9. damaging the validity of the multi burst test In such case only genuine slow sweep signal test can reveal the true shape of frequency response Pei aie i HN H Loeb one ed Vertical scale is D1 8 bit Reference Black 16 Reference White 2235 Horizontal co ordinate Y pixel count from 0 to 719 2005 2009 by VideoQ Inc all rights reserved 19 User Manual Running VQMA in Windows GUI mode 4 4 6 UV Vector Graph page This page displays averaged waveforms of U and V signals selected from the color bars band of VQMA matrix test pattern Type of averaging filter can be selected via Options menu U CR and V CB levels are in D1 8 bit scale Seven target zones red squares on color bars vector display are sized to represent 5 2 5 of nominal UV range Central points of these squares represents reference 75 Color Bars UV values for both systems NTSC and PAL are the same This page also allows visual estimation of C channel dynamic quadrature distortions Non distorted chrominance transitions are mapped as straight lines but distorted transitions appear bended The curvature of lines on the display is usually affected by tuner performance TIL ERE En E REIS 2 EE s LLL FH oak a a nee Seen LLLI
10. illegal colors e g modulated ramp contains zero Y value pixels with non zero UV values so called colored black For this reason any conversion of test video data into RGB or BMP format or any other processing forcing color legalization is not acceptable After legalization even if the test pattern look the same it cannot be used for measurements Important because SECAM color subcarrier is frequency modulated the differential phase and differential gain distortions do not affect the demodulated YUV data on modulated ramp i e on Band 6 of matrix test pattern Thus in case of demodulated SECAM signal these two parameters are irrelevant and should be ignored SECAM decoders typically use low pass or notch filters in demodulated luminance channel which implies special not so strict target values for VOMA automatic analysis of frequency response and K rating i e measurements of Bands 3 and 5 Customized versions of NTSC and PAL SECAM DVDs supplied with the program may contain the VOMA Test Matrix as above plus some other test patterns these are just useful extras not related to VOMA measurement process 2005 2009 by VideoQ Inc all rights reserved VQMA User Manual Software Installation and General Setup 8 3 2 Capturing and Saving Video Data File 1 Supply CVBS S Video YPbPr or RF signal of the VOMA matrix test pattern to the appropriate input of capture device under test 2 Run any capture software dri
11. the end of current cycle of measurements 4 4 Menu View This menu allows selection of Test Summary page or partial test result pages as described in the following sub sections View Options Help Test Summary Staircase Display Differential Gain Differential Phase Frequency Response K Rating C vs Y Gain Delay UV Vector Graph Noise Measurement Default page selection is Test Summary Test Date and Time are shown at the top and Video File Name full path is shown at the bottom This information is always presented on all VOMA pages Choice of selected page is persistent same page will be shown after analysis of any new file until the selection by user of some other page 2005 2009 by VideoQ Inc all rights reserved User Manual Running in Windows GUI mode 14 4 4 1 Viewing Test Result Pages produces several result presentation pages which are displayed at a time each page containing detailed report about the particular type of video distortions e Test Summary table shows all results plus partial and global Pass Fail flags e Staircase display shows waveform Black and White levels e Differential Gain also contains DG profile display e Differential Phase also contains DP profile display Frequency Response also contains multi burst waveforms display K rating Y C Gain and Delay also contains 2 20 pulse waveforms display e UV Vectorscope Display
12. C YUV frames xxx pal Multiple PAL frames Supported types FOURCC UYYY or YUY2 min duration 8 TV frames 2005 2009 by VideoQ Inc all rights reserved 23 User Manual Running VQMA Windows GUI mode 5 Running in DOS Mode VOMA EXE can be used in DOS window under Windows XP in unattended robotic mode Note that in previous versions the executable file name was shortened to VOM EXE GY C WINDOWS system32Vcmd exe x Microsoft Windows Version 5 1 2600 lt C gt Copyright 1985 2001 Microsoft Corp C uq gt vqm i ntsc avi vqm4ntsc txt gt 5 1 Command Line Parameters To run the VOMA EXE within Windows DOS box use the following command line i InFileName y Format lt OutFileName gt where InFileName and lt OutFileName gt can be absolute path or file name which defaults to the same directory where the VOMA executable resides command line characters must be entered lower case Optional y flag and following Format parameter allow to switch between two alternative multiplexing formats of YUV data UYVY and YUV2 YUYV Four characters long Format string should be either uyvy or yuv2 If y flag is not present VOMA EXE defaults to YUV2 format This does not affect the processing of avi files which is controlled by FOURCC code read from input file header The i y and o option fla
13. Default Format YUV2 Exit User can perform standard Windows functions Open File Print Print Preview and Exit Sub menu Open File invokes standard File Open Windows dialog box User can browse folders to find and open pre captured video file Default file type is avi Sub dialog Files of type allows opening files of other types single frame yuv files or multi frame nts pal In Print Preview sub menu each of eight on screen pages of VQMA test results can be previewed and printed separately VOMA EXE automatically set printer page orientation to Landscape Manually switching printer into Portrait mode may result in unreadable print out It is advisable to use PDF writer e g PDF Factory to create electronic reports of VOMA test results paper copies can also be printed if necessary Default name for VOMA PDF Report file is suggested by printer and typically include drive letter folder name and AVI file name Menu File also includes two VQMA specific functions e Default Format this allows to toggle between two alternative formats of YUV NTS PAL files to be opened but does not affect the processing of AVI files which is controlled FOURCC code read from AVI file header e Save Report this allows user to browse folders and save short text report in TXT or CSV format User can select any folder and file name for this report Format of saved report is similar to DOS mode output described in the co
14. Ds as Video Source There are two 4 video files supplied one for NTSC and one for PAL SECAM providing the reference matrix test pattern video source on the CVBS S Video Y C and or YPbPr YUV outputs of a professional or semi professional video play out card if such card is installed on a PC Note that typically Video Out signals provided by video players via PC graphic adapter or graphic card on CVBS output are not suitable for VOMA analysis There are also two DVD disks supplied one for NTSC and one for PAL SECAM providing the reference matrix test pattern video source on the CVBS S Video Y C and or YPbPr YUV outputs of any good quality DVD player If necessary CVBS signal from video play out card or DVD player can be converted into RF signal via optional external modulator not supplied Note that video levels are measured as supplied by the actual source Some DVD players may output non calibrated video with up to 2596 errors of sync pulse level This may affect the test results Higher degree of accuracy can be achieved by using the professional hardware based well calibrated test signal generator loaded with VOMA test matrix pattern All In One Single pattern allows automatically measure multiple video signal parameters Upper Band for visual estimation only TIT BSS SBS SEBS eee eee 117 QR Test Signal 2 lt 11 Parameters Colour Bars m Chroma Vectors n a a
15. Success 0 12 dB Success FR2 10 19 05 2 13 14 PM 10 19 05 2 13 14 PM Success 0 77 dB Success FR3 10 19 05 2 13 14 PM 10 19 05 2 13 14 PM Success 1 35 dB Failure FR36 10 19 05 2 13 14 10 19 05 2 13 14 PM Success 1 88 dB Failure FR42 10 19 05 2 13 14 PM 10 19 05 2 13 14 PM Success 3 05 dB Failure FR58 10 19 05 2 13 14 PM 10 19 05 2 13 14 PM Success 4 38 dB Failure Each parameter code is followed by the test time interval start and finish first codeword Success or Failure measurement result value unit of measurement and the second codeword Success or Failure The first Success or Failure shows if the test took place independent of the actual capture device performance This Failure could be caused for example by wrong input file name wrong input file length or wrong FOURCC code in the AVI header The second Success or Failure in each line shows the compliance of the device with the target values set in the INI file Thus the global Success flag is a simple logical AND function of all partial Success flags Next is a sample of target values presentation within VONTSC INI file It contains a simple list of target values for all parameters For each parameter the target values are defined by four consecutive lines Parameter Code in square brackets Unit Of Measurement Name Lower Limit Minimum Value mu uuo D Es Upper Lim
16. VOMA Video Quality Measurement Software Version 2 4 3 User Manual ideoQ Video Quality Measurement Software by VideoQ Inc Software Video Analyzer to measure the quality of captured and streamed video Ideal tool for video development labs software developers and high volume manufacturing instantly revealing your video capture device performance VQMA User Manual 2005 2009 by VideoQ Inc all rights reserved All rights reserved No parts of this work may be reproduced in any form or by any means graphic electronic or mechanical including photocopying recording taping or information storage and retrieval systems without the written permission of the publisher 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 Author Victor Steinberg Printed May 2009 in Santa Clara Californ
17. ameter If these INI files are not found in the program folder then they are created automatically by VQMA EXE with the default tolerance values VQNTSC INI and VQPAL INI file names are reserved and cannot be modified The content of the INI files can be edited using any text editor like Notepad to apply the tolerance values more appropriate for the particular device under test It should be done with caution because the list of parameters and units of measurement codes should not be modified Only actual numerical values e g frequency response drop for some particular frequency can be amended For example the MIN tolerance for 3 MHz burst can be changed from 1 dB default to 3 dB It is recommended to store customized INI files under the names which are different from the reserved ones e g MY_PAL INI To use these customized INI file simply rename a copy of the selected file MY_PAL INI to VQPAL INI overwriting the default file It is also advisable to keep a backup copies of the original files thus allowing to revert to the default values if necessary The process of replacement of the INI files can be automated by usage of conventional batch files scripts 2005 2009 by VideoQ Inc all rights reserved User Manual Customization and Editing of INI Files 28 7 Terms and Abbreviations Term AVI CSV CVBS DG DP DVD EBU NTSC PAL RMS SNR SMPTE TXT UV YUV Explanation Audio
18. ao Hit II Il HEBES T IT Grey scale Nonlinearity Y Levels WEHWONHHEUPEEHUEENUN 2T pulse K rating er puo Modulated Ramp Differential Gain Differential Phase s susuubPuEEFPUNUPUNPUNENPUUSNPUNUPUVEMFPUUN YUV2RGB conversion Detection Illegal Colors Noise amp Interferences accurately measured on any static image by analysis of frame differences First topmost band of VQMA test pattern serves for visual assessment of monochrome or non saturated colors rendition It is also useful for revealing timebase errors scalers deinterlacers codecs performance patterned noise interferences and other artefacts Currently this band is not used for any objective measurements The appearance of this band may differ in customized versions of VOMA 2005 2009 by VideoQ Inc all rights reserved 7 User Manual Software Installation and General Setup The upper band layout of actual test patterns encoded as MP4 files or recorded on DVD as VOB MPEG2 files may slightly differ It does not affect the program performance and the accuracy of the results Five lower bands of the matrix serve for simultaneous parallel analysis of all parameters describing the performance of signal transmission chain or the signal capture device under test Note that some parts of VOMA matrix pattern contain
19. aunched and used in two modes e Windows GUI mode e DOS box mode Windows GUI mode Starting VOMA EXE without any command line parameters brings up standard Windows GUI This mode is intended for laboratory design adjustments and verification procedures with measurements results presented in graphical format suitable for printing e g creating PDF document In Windows GUI mode it is possible to produce printed reports with more details containing all results including diagrams and screenshots Short form TXT or CSV machine readable report files are also available and can be saved as required DOS box mode DOS box mode under Windows requires command line parameters and usually involve running batch file in the background unattended mode This provides log file with all important test results presented in machine readable format for inclusion in higher level automated QA systems In DOS window mode test results are always presented as a set of comma separated values within a report file of TXT or CSV format 2005 2009 by VideoQ Inc all rights reserved User Manual Supported File Formats 4 2 Supported File Formats VQMA EXE can open any one file of the following types AVI AVI video clip this is default extension for dialog box recommended mode YUV Single frame of raw YUV data suitable for quick video parameters check also saving HDD space NTS Multiple frames of raw YUV NTSC data without any h
20. eader or wrapper used mainly in the design lab environment instead of AVI PAL Multiple frames of raw YUV PAL SECAM data without any header or wrapper used mainly in the design lab environment instead of AVI File name extensions directly control VOMA operation other file types and extensions are not supported To provide for full and accurate measurement any input video file should contain a number of captured TV frames with uncompressed YUV data of VQMA test pattern Total duration of NTS or PAL video file should be equal or greater than 8 TV frames VQMA analyzes only first 32 frames larger sizes of input files are acceptable but it does not improve the VOMA measurement accuracy video quality parameters can also be measured by fast analysis of single frame YUV files but with significantly lower accuracy In any case video file should contain video data of VOMA test pattern arranged as 4 2 2 UYVY UYVY YUYV YUY2 also known as YUV2 multiplex of 720 pixels 1440 samples of 480 or 486 TV lines NTSC or 576 TV lines PAL Data should conform to 8 bit D1 601 quantization scale Black Y 16d White Y 235d Grey UV 128d Currently there are only two FOURCC codes supported UYVY and YUY2 There is also a special file name reserved for YUV files which contain only noise on flat grey background If the file is saved as noise yuv any name starting with noise e g NOISE32 YUV
21. gs should be entered as is Long file names are accepted but the total command line string length should not exceed 256 byte Multi frame nts and pal formats are supported The extension of OutFileName could be txt or csv defaults to txt If necessary multiple or variable commands can be organized using standard Windows batch files or scripts Here is the example of such bat file rem VideoQ Inc Copyright c 2005 2008 i example o example pal csv exit 2005 2009 by VideoQ Inc all rights reserved User Manual Running VQMA in DOS Mode 24 5 2 Test Results Presentation The results can be found in the lt OutFile gt They are presented in three sections 1 VideoQ copyright info commented out by semicolons 2 Test results in form of comma separated ASCII data 3 Copy of the INI content commented out by semicolons this section allows to log if necessary the actual target values used for the test The most important is Section 2 First line of section 2 shows version followed by actual test date and time Next 14 lines contain the results of partial tests starting with the parameter code in form of two three or four ASCII characters BL Black Level in of nominal video range e g 2 8 WL White Level in of nominal video range e g 99 3 SNR Unweighted Luminance Channel Signal To Noise Ratio in dB e g 52 23 KR K rating in e g 0 94 CYD
22. he upper right corner of every page 2005 2009 by VideoQ Inc all rights reserved 15 User Manual Running VQMA in Windows GUI mode 4 4 2 Test Summary page The table shows the results of all partial tests whilst the most important global result is displayed in the upper left corner This is shown as one word which can be either Passed in green or Failed in red it is produced by logical AND function of partial test result flags of the table Leftmost column contains the partial test name name of the measured parameter Next two columns shows measured value of the particular parameter and unit of measurement The Target column shows actual test tolerance values read from INI file The rightmost column of the table shows partial test results These are displayed as green ticks if partial test passed or red crosses if partial test failed 74 C Work 2v4 CD Release 26 April Samples Input NTSC rmat avi VOMA Vt 2009 Samples AVIs put NTSC YUY2 foi M lola je File OnLine View Options Help VOM Test Failed Wed 13 00 15 12 2009 Vi deo Qu ali ty Test Summ ary Mean values for 50 x 24 lines over 24 frames Parameter Measurement Unit Target Pass Black Level 0 2 15 5 8 bits 5 0 v White Level 103 3 242 1 8 bits 95 0 105 0 v Unfiltered Y SNR 46 94 dB gt 40 dB v K Rating on 2T Pu
23. ia USA Special thanks to All colleagues at VideoQ Philips Semiconductors and nVIDIA who contibuted to this product development Revision History Revision Date Description 1 1 2005 January 14 Beta 2 2 2005 October 06 Release 2 3 2006 March 31 Release 2 4 1 2008 August 28 X Release 2 4 2 2009 April 26 Release 2 4 3 2009 May 12 Release VQMA User Manual Table of Contents 1 Introductions oem 2 2 Supported File Formats c ecocee errante eren dan aa ia ao neesi 4 Software Installation and General Setup 5 3 1 Test Pattern Files and DVDs as Video Source 6 3 2 Capturing and Saving Video Data File 2 2 2 1 8 4 Running in Windows GUI mode 10 NI EZ MN m 10 4 2 K rating Y C Gain and Y C Delay page 12 4 3 ROTI OnLine ct 13 CEN E VIEW LT 13 4 4 1 Viewing Test Result Pages 14 44 2 Test Summary page interrete eer 15 4 4 3 Staircase Display em 16 4 4 4 Diff Phase and Diff Gain pages esecseseeeseseeeeseeeeeeesenseeeeeeeeesneaeseseeeeesaeseseaesasneeeseeeseseaeeneeeeeeeas 17 4 4 5 Frequency Re
24. ircase Display page 4 6 Menu Help Help menu contains two items About VQMA program Short Guide 4 6 1 About VOMA program This sub menu shows program version copyright and technical support information About VQMA Program m v Version 2 4 3 Video Inc Copyright 2005 2009 Technical support support videog com 2005 2009 by VideoQ Inc all rights reserved User Manual Running VQMA in Windows GUI mode 22 4 6 2 Short Guide This sub menu produces pop up box with short description of modes of operation and supported video file formats Short Guide rcm be launched in two modes 1 Double click the executable icon to launch Windows GUI mode 2 Open DOS box go to the directory containing and type vqma to launch Windows GUI mode or vqma i lt inF gt lt Format gt o lt outF gt to launch command line lt Format gt uyvy or yuv2 if y is omitted format defaults to yuv2 Parameters lt inF gt and lt outF gt be absolute path or file name which defaults to the same directory where the executable resides Option flags i y and o should be entered as is The extension of lt outF gt could be txt or csv defaults to txt Input data should be uncompressed 4 2 2 720x480 720x486 or 720x576 Supported file types xxx avi AVI video clip XXxx yuv Single YUV frame xxx nts Multiple NTS
25. it Maximum Value 2005 2009 by VideoQ Inc all rights reserved User Manual Running in DOS Mode 26 VONTSC ini VideoQ inc Copyright c 2005 BL BLUNIT BLMIN 5 00 BLMAX 5 00 WL WLUNIT WLMIN 95 00 WLMAX 105 00 SNR SNRUNIT dB SNRMIN 40 00 KR KRUNIT KRMAX 3 00 CYD CYDUNIT ns CYDMIN 40 00 CYDMAX 40 00 CYG CYGUNIT dB CYGMIN 1 00 CYGMAX 1 00 DG DGUNIT DGMAX 5 00 DP DPUNIT degree DPMAX 5 00 FRI FRIUNIT dB FRIMIN 1 00 FRIMAX 1 00 FR2 FR2ZUNIT dB FR2MIN 1 00 2 1 00 FR3 FR3UNIT dB FR3MIN 1 00 FR3MAX 1 00 FR36 FR36UNIT dB FR36MIN 1 00 FR36MAX 1 00 FR42 FR42UNIT dB FR42MIN 1 00 FRA2MAX 1 00 FR58 FRS8UNIT dB FRS8MIN 1 00 FRS8MAX 1 00 2005 2009 by VideoQ Inc all rights reserved 27 User Manual Customization and Editing of INI Files 6 Customization and Editing of INI Files VQMA EXE checks the captured input video data e g read from AVI file against the tolerance values contained within one of the following files VQNTSC INI or VQPAL INI VQMA automatically detects NTSC or PAL video file and selects the appropriate INI file The INI files must be present in the program folder they are editable so the users can input their customized tolerance values for any par
26. logging of the test results in DOS mode should be organized by the user e g in form of script or batch file tool is also capable to process other video file formats and test patterns as described in the Supported File Formats section but some analysis functions will be not available or disabled For example VOMA noise measurement algorithm requires access to multiple frames of matrix test pattern but it can also be done by processing single frame of uniform grey field Quite often for calibration and debugging purposes user needs just a valid display of Y waveform plus UV vector graph In such case it is enough to provide file containing single frame of VOMA matrix or any other YUV file containing standard 75 color bars pattern e g SMPTE bars or EBU bars on red 2005 2009 by VideoQ Inc all rights reserved 9 User Manual Software Installation and General Setup 2005 2009 by VideoQ Inc all rights reserved User Manual Running in Windows GUI mode 10 4 Running in Windows GUI mode Click on the VOMA executable icon or launch VOMA EXE with no parameters specified in the command line to open GUI with standard Windows menus and dialog boxes 4 4 Menu File This menu should be used first after launch of VOMA EXE Untitled VOMA OnLine View Options Help Open File Ctrl O Print Ctrl P Print Preview Save Report Default Format UYUV v
27. lse 1 92 s 3s v Chroma vs Luma Gain 0 60 1 00 1 00 v Chroma vs Luma Delay 74 ns 40 40 ns x Differential Gain 1 04 Li UN v Differential Phase Ja degree lt 5 degree Y Freq Response 8 1 00 MHz 0 84 dB 1 0 1 0 dB v Freq Response 8 2 00 MHz 1 04 dB 1 0 1 0 dB x Freq Response 3 00 MHz 1 99 1 0 1 0 x Freq Response 8 3 58 MHz 2 16 1 0 1 0 x Freq Response 4 20 MHz 13 09 1 0 1 0 Freq Response 8 5 80 MHz 39 07 3 0 1 0 dB x SIL Reference Test C _Work _VQMA 2v4 CD Release 26 April 2009 Samples AVIs Tuner Input NISC YUY2 format avi Left picture represents reference undistorted test pattern Picture on the right shows first TV frame extracted from the captured video clip under test 2005 2009 by VideoQ Inc all rights reserved User Manual Running in Windows GUI mode 16 4 4 3 Staircase Display page This page displays Black Level and White Level measured on averaged VQMA matrix pattern They are presented above the plot in of nominal range and also as D1 8 bit levels in brackets Actual staircase signal waveform averaged by the filter selected in Options menu is shown on the diagram superimposed over Reference Black and White levels designated by green dotted lines Black Level 23 6 White Level 101 6 238 5 Luma
28. ntributions by regular textures e g from those caused by RF interference or digital clock pick up Y Noise Level RMS 3 56 8 bit level Y SNR unfiltered 35 79 dB UV SNR 1 5 MHz 43 36 dB Y SNR 4 2 MHz 36 13 dB Y SNR 4 2 MHz weighted 42 08 dB Y SNR 6 0 MHz 36 10 dB Y SNR 6 0 MHz weighted 42 07 dB Noise Spectrum Noise weighted in red 8 x Noise The picture at the bottom right corner of the page shows boosted x8 gain noise pattern on grey background This also helps to differentiate true random noise from other unwanted but more or less periodic signals 2005 2009 by VideoQ Inc all rights reserved 21 User Manual Running VQMA Windows GUI mode 4 5 Menu Options Options menu allows selection of spatial temporal averaging filters used to reduce the harmful effect of noise which affects the accuracy of measurement Single Frame Single Line Single Frame Multiple Lines Multiple Frames Multiple Lines This menu is for advanced users Default selection is Multiple Frames Multiple Lines it allows maximum reduction of noise influence over the test results This selection is mandatory for Summary Page and Noise Measurement Page When user selects in View menu any one of these two pages the Options menu automatically reverts to Multiple Frames Multiple Lines Two other options could be used to compare the behavior and amount of noise e g when viewing the Sta
29. of its counterpart of opposite polarity white needle pulse then the distortions are rather linear In case of strong non linearity caused for example by protective black or white level limiter the overshoots of two needle pulses will look quite different Display of U blue and V red components of demodulated 20T composite pulse allows to distinguish between linear and non linear causes of Y C delay errors From the plot above it could be seen that there are both types of distortions present Both U and V are delayed wrt Y but V delay is much higher probably because of the chroma bandwidth asymmetry The most probable reason bad design lack of tuning or malfunction of the tuner Less probable reason wrong settings of the composite decoder controls 2005 2009 by VideoQ Inc all rights reserved 13 User Manual Running VQMA Windows GUI mode 4 3 Menu OnLine This menu item is reserved for future use to control video capture devices installed and recognized by Windows Current version does not support Live Capture mode so this menu is shown in grey View Options Help v Auto Menu contains three commands e Start Live Mode Start Capture e Stop Live Mode Stop Capture e Auto Default is Auto in this mode the on line capture process is repeated indefinitely video data refreshment rate is controlled by VOMA program This allows video data capture process to re start immediately after
30. rrespondent section of this manual but in Windows mode there 2005 2009 by VideoQ Inc all rights reserved 11 User Manual Running VQMA Windows GUI mode is one extra line showing full name of input file 2005 2009 by VideoQ Inc all rights reserved User Manual Running in Windows GUI mode 12 4 2 K rating Y C Gain and Y C Delay page This page displays averaged waveforms of Y U and V signals selected from the 5th band of VOMA matrix test pattern It also shows the measurements results for three parameters related to this 5th band 1 K rating in measured on 2T pulse white needle pulse 2 C vs Y Gain in dB measured on 20T composite pulse 3 vs Y Delay in ns measured on 20T composite pulse Chroma vs Luma Gain 1 58 dB Blue U Chroma vs Luma Delay 287 ns Red V K Rating on 2T Pulse 1 47 Black Y 250 100 200 50 150 100 50 50 100 0 150 0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 Vertical scale is D1 8 bit Reference Black 16 Reference White 235 Horizontal co ordinate Y pixel count from 0 to 719 Black needle pulse is present on the display but its distortions are not included in the K rating calculation However this particular test signal component is useful for estimation of quadrature and other non linear distortions If its shape correlates well with the shape
31. sponse page 1 esee nennen nenne nnn nnmnnn nnmnnn nnnm nnmnnn nnmnnn nenna nannan 18 4 4 6 UV Vector Graph page eenean ennnen 19 4 4 7 Noise Measurement page esses esee nennen nennen nnn nnmnnn nnmnnn nnmnnn ennnen nnmnnn ennn nnen nna 20 4 5 Menu Options ucaxceogodndiie aed aad in 21 4 0 Menu Help M 21 4 6 1 About VQMA program 21 46 2 Short GUE NI RR RR 22 5 Running in DOS Mode ccce 23 5 1 Command Parameters 23 5 2 Test Results Presentation UNE RM RE ES 24 6 Customization and Editing of INI Files 27 7 Terms and Abbreviations 25222 22 2 22122222222 5 28 2005 2009 by VideoQ Inc all rights reserved VQMA User Manual Introduction 2 1 Introduction is a self contained software solution allowing manual or automated measurement of the performance of video capture devices in a PC running Windo
32. t e g AVI file containing at least 8 consecutive uncompressed video frames UYVY or YUV2 format with native 4 2 2 resolutions e 720 x 480 or 720 x 486 for NTSC e 720 x 576 for PAL or SECAM VOMA analyzes YUV video data stored in this file e g in AVI video clip and produces detailed test report Measured values are automatically checked against values stored in the INI file e g values from the Microsoft MCE requirements Editable INI files allow customization of the test requirements to match the performance of particular devices or board types models The accuracy of measurements is typically better than 1 10 of the target tolerance range e g typical errors are about 0 5 for video levels and about 0 1 dB for frequency response Analysis of decompressed video e g after MPEG encode decode is also possible if the output is presented in 4 2 2 YUV format compatible with VOMA software Horizontal and vertical image position errors of few pixels do not affect VOMA results accuracy On the other hand scaling and or cropping of captured video data may produce very big errors therefore they should be switched off during VOMA test Partial test procedures result in several partial pass fail flags corresponding to each particular parameter such as white level or Y C delay These flags are combined together using logical AND function thus providing a global single bit pass fail flag software can be l
33. ver or Direct Show graph available on the system e g AMCAP 2 1 The specified capture time should be equal or greater than 8 TV frames recommended capture duration is slightly more than 32 frames e g 2 seconds Note that capturing video clip of longer duration is acceptable but it does not improve the accuracy of VOMA results 2 2 Select file format as uncompressed AVI with FOURCC code UYVY or YUV2 2 3 Select native full resolution 720 x 480 or 720 x 486 for NTSC 720 x 576 for PAL or SECAM All this actions should be done by user prior to the measurement and analysis stage described in the following sections The process of capturing new AVI file should be finished and file closed before the open input function of the VQMA program is performed It is possible to give the AVI file any name of user choice and store it in any folder on any local hard drive It is not recommended to use network drives because of the high bandwidth required for normal operation of the software VOMA remembers the location of the folder with last opened file so File Open dialog defaults to this location Manual or automatic update of captured video data and corresponding update of test results are possible at the rate of about 2 3 seconds this is typical capture plus analysis time interval for medium speed PC The update of captured AVI data file renaming appending and or overwriting of the relevant files as well as systematic
34. ws OS Used in cascade with high quality capture device can measure the quality of the incoming video signal System Requirements e Windows 2000 XP or higher e About 1250 Kb of disk space VQMA measures and display the following parameters e Black and White levels of Grey Scale pattern e Differential Gain and Phase e Frequency Response on standard multi burst frequencies e K rating on 2T pulse e Y vs C Gain and Delay on 20T pulse e Chroma Vectors Display Vectorscope with 2 5 zones e Weighted and Unweighted SNR for Y and UV Noise Spectrum Display A source of special VOMA Matrix Test Pattern DVD player s or test signal generator should be connected to the input s of the capture device as shown on the diagram below Tuner input performance should be tested via the external RF modulator not supplied Optional second RF modulator can be used to simulate an interference channel TSG with RF modulator Passive RF mixer Capture Card under test A V TSG with RF modulator PCI PCle or AGP YUV and audio files Measurement SW CVBS Y C YPrPb DVD player Download or via printer cable Programmable Test Pattern or Insert DVD Generator 2005 2009 by VideoQ Inc all rights reserved 3 VQMA User Manual Introduction Captured test pattern video data should be stored on fast access media e g HDD in a file of suitable forma
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