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Standards Subgroup Of the Digital Television Working Group

UPDATE. Presenter. John Knox, Manager Video Applications Group Langley Research Center. Standards Subgroup Of the Digital Television Working Group. DTV WORKING GROUP Standards Sub-Group. 5.1.1 High Definition. Aspect Ratio: 16X9 Frame Rate: Film Transfer - 24 FPS

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Standards Subgroup Of the Digital Television Working Group

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  1. UPDATE Presenter John Knox, Manager Video Applications Group Langley Research Center Standards Subgroup Of the Digital Television Working Group

  2. DTV WORKING GROUP Standards Sub-Group 5.1.1 High Definition • Aspect Ratio: 16X9 • Frame Rate: Film Transfer - 24 FPS Production - 30 FPS Analysis - 60 FPS • Scanning: TBD Following Testing • Resolution: TBD Following Testing Picture Formats

  3. DTV WORKING GROUP Standards Sub-Group 5.1.1 High Definition • Aspect Ratio: 16X9 • Frame Rate: Film Transfer - 24 FPS Production - 30 FPS Analysis - 60 FPS • Scanning: TBD Following Testing • Resolution: TBD Following Testing Update

  4. DTV WORKING GROUP Standards Sub-Group HD Test Configuration • Used portable 720p and 1080i cameras • HD-D5 VTR for recording both • Evaluation using same monitor for both HD signals • Multiple test subjects Resolution Chart Line, Text and Back-Focus charts, static & rotating $20 bill Soccer Ball Test Methodology

  5. DTV WORKING GROUP Standards Sub-Group Interlace Remote Camera Control HD-D5 HD 30” SDI 1000 TVL Monitor Analog-to-Digital Converter Y, Pb, Pr Analog Digital WFM Y, Pb, Pr Camera Progressive Analog Control Unit Camera HD-SDI Fiber/ Copper Camera Cable HD-D5 HD Test Configuration Methodology

  6. DTV WORKING GROUP Standards Sub-Group • Note: • Blurred Lines Interlace Freeze Frame Test Results

  7. DTV WORKING GROUP Standards Sub-Group • Note: • Clear Line Definition Progressive Freeze Frame Test Results

  8. DTV WORKING GROUP Standards Sub-Group Area of Interest The World’s Most Cost Effective HD Test Chart Test Methodology

  9. DTV WORKING GROUP Standards Sub-Group • Note: • Clear Line Definition Progressive Freeze Frame Test Results

  10. DTV WORKING GROUP Standards Sub-Group • Note: • Moire Interlace Freeze Frame Test Results

  11. DTV WORKING GROUP Standards Sub-Group • Note: • Smear • Swirl Direction Interlace Freeze Field Test Results

  12. DTV WORKING GROUP Standards Sub-Group Correct Incorrect Progressive Interlace Test Results

  13. DTV WORKING GROUP Standards Sub-Group Test Results • Interlace Scan showed artifacts, distortion Interlace Freeze Frames have interfield jitter on moving objects Interlace Freeze Fields are inaccurate (Interlace line pairing and effective line doubling of output caused distortions) • Progressive Scan video showed NO artifacts Conclusion

  14. DTV WORKING GROUP Standards Sub-Group Test Results • Interlace cameras discharge the entire CCD every field. Adjacent line pairs are combined on the output. This effectively reduces vertical resolution by 30% on either frame or field basis A 1080i frame has 756 lines of vertical resolution without taking interlace artifacts into account A1080i field has 378 lines of vertical resolution • Effective resolution of Sony HDCAM is 1440 X 756 with interlace artifacts evident in freeze frames and distortion in freeze fields • Interlace scan video originated for production use (Public Affairs, etc.) may not be suitable for analysis Conclusion

  15. DTV WORKING GROUP Standards Sub-Group Test Results • Progressive cameras by definition have no fields and thus exhibit no interfield jitter • Progressive had better performance at normal play speed • Progressive had better performance in still frame • Progressive converted to other video formats well, without artifacts Progressive video generated for analysis purposes can be easily and transparently converted to interlace, if necessary, for Public Affairs use Conclusion

  16. DTV WORKING GROUP Standards Sub-Group Test Results • 720p transcoded to 1080i - No visible artifacts are introduced in the transcoding A progressive scan of the $20 bill shot transcoded to 1080i showed fewer artifacts than the 1080i original • 1080i transcoded to 720p - Interlace artifacts were still visible Conclusion

  17. DTV WORKING GROUP Standards Sub-Group RECOMMENDATIONS 5.1.1 HD Standards Summary Scanning - Progressive Resolution - 1280 X 720 Conclusion

  18. DTV WORKING GROUP Standards Sub-Group RECOMMENDATIONS 5.1.2 Standard Definition Summary SMPTE 259M (CCIR 601), 720 X 480 Scanning - Interlace or Progressive Aspect ratio - 4:3 or 16:9 (Should be switchable) Conclusion

  19. DTV WORKING GROUP Standards Sub-Group RECOMMENDATIONS 5.2.1 Audio Summary • Acquisition - AES-3 Uncompressed • Post Production Recording/Editing - TBD • Distribution Contribution - AES-3 Uncompressed Viewing - AC-3 Conclusion

  20. Thank You Standards Subgroup for the Digital Television Working Group

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