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M16758 – Influence of views and depth compression onto quality of synthesized views

M16758 – Influence of views and depth compression onto quality of synthesized views. Krzysztof Wegner Krzysztof Klimaszewski Marek Domański team supervisor: Marek Domański Chair of Multimedia Telecommunications and Microelectronics Poznań University of Technology, Poland. July, 2009, London.

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M16758 – Influence of views and depth compression onto quality of synthesized views

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  1. M16758 – Influence of views and depth compression onto quality of synthesized views Krzysztof Wegner Krzysztof KlimaszewskiMarek Domańskiteam supervisor: Marek Domański Chair of Multimedia Telecommunications and MicroelectronicsPoznań University of Technology, Poland July, 2009, London

  2. Multiview system M16758 – Influence of views

  3. Multiview system M16758 – Influence of views

  4. How to compress depth maps? Can MVC be used? How to share bandwidth between views and depth maps? Which one is more important? What is the optimal ratio? Depth map compression issues M16758 – Influence of views

  5. Differences between depth maps and views Depth map features M16758 – Influence of views

  6. What is the influence of depth map decimation on the view synthesis process? Depth map decimation M16758 – Influence of views

  7. Test setup M16758 – Influence of views

  8. View quality measurement M16758 – Influence of views

  9. The following software and camera numbers were used: Cameras and software VSRS version 3 DERS version 3 JMVC version 3 M16758 – Influence of views

  10. Synthesis quality for UNCOMPRESSED view and depth map Results M16758 – Influence of views

  11. Results for compressed data – Book Arrival Results M16758 – Influence of views

  12. Results for compressed data – Book Arrival Results M16758 – Influence of views

  13. Results for compressed data – Pantomime Results M16758 – Influence of views

  14. Results for compressed data – Pantomime Results M16758 – Influence of views

  15. Results for compressed data – Newspaper Results M16758 – Influence of views

  16. Results for compressed data – Newspaper Results M16758 – Influence of views

  17. Subjective tests • A single-stimulus test was conducted • 15 spectators • quality was rated from • 5 (“imperceptible artifacts”) to • 0 (“very bad with annoying artifacts”) • The original video from actual real camera was used as hidden reference. M16758 – Influence of views

  18. Subjective quality 1/3 M16758 – Influence of views

  19. Subjective quality 2/3 M16758 – Influence of views

  20. Subjective quality 3/3 M16758 – Influence of views

  21. Optimal QD for depth map • Depth quantization parameter index QD has negligible (less than 0.2 dB decrease) impact on synthesized view quality as long its value is smaller than the following threshold estimated from the experiments M16758 – Influence of views

  22. it is possible to transmit the depth maps using MVC codec with sufficient quality view quality is much more important than depth quality in terms of synthesized view quality depth bitrate can be kept as low as 10 - 20 % of total bitrate without significant loss of synthesized view quality (for decimated depth map) Conclusions 1/2 M16758 – Influence of views

  23. Conclusions 2/2 • for a certain range of values of quantization parameter index for depth compression (QD) , no change of synthesized view quality is noticeable • higher compression rate with comparable quality can be obtained by decimating the depth map by a factor of 2 M16758 – Influence of views

  24. We recommend to consider usage of decimated depth map in future depth map coding experiments. Recommendations M16758 – Influence of views

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