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October, 2009, Xi’an

M17051 - Newspaper sequence - Results of 3DV/FTV Exploration Experiments with depths and view synthesis. Krzysztof Klimaszewski Olgierd Stankiewicz Krzysztof Wegner team supervisor: Marek Domański

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October, 2009, Xi’an

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  1. M17051 - Newspaper sequence - Results of 3DV/FTV Exploration Experiments with depths and view synthesis. Krzysztof KlimaszewskiOlgierd StankiewiczKrzysztof Wegnerteam supervisor: Marek Domański Chair of Multimedia Telecommunications and MicroelectronicsPoznań University of Technology, Poland October, 2009, Xi’an

  2. EE1 • ‘Newspaper’ sequence • Recommended settings • Semiautomatic DERS5.0 + VSRS3.5 • Half-pixel • new manual information for key frames • Smoothing coefficient 1.0-4.0

  3. Background – wrong depth M16756 - Results of Exploration Experiments

  4. new MDM file Frame 100 Frame 200

  5. new MEM file Frame 100 Frame 200

  6. Synthesis results - comparison

  7. Best results • Half-pixel precisionis 0.3dB betterthan pixel precisionwhich is 0.2dB betterthan quarter-pixel-precision • Results aresubjectively better

  8. Depth map obtained for frame 0, 100, 200

  9. Conclussions • Semi-automatic DERS is better than automatic DERS • Still more key frames is needed to achieve better quality

  10. EE 4 • JMVM 5.0.6 • GOP length was set to 16 • Targeted bitrates 0.75, 1.5, 3, 6 Mbps for 2 view case • QP – Quantization index for views • QD – Quantization index for depth maps M16756 - Results of Exploration Experiments

  11. Quantization parameters • Selected QP and QD indexespairswhichmeettargetedbitrate

  12. Results – 750 kbps

  13. Results - PSNR

  14. Results – PSNR without outer

  15. Results – PSPNR temporal

  16. Results – PSPNR spatial

  17. Results - summary

  18. Summary • Quality of synthesized view depends more on quality of compressed/decompressed image (QP parameter) than on quality of compressed/decompressed depth (QD). • The usual approach of choosing the minimal QP does not give the best results in some cases, but the differences of quality measures are neglible. • When quality of synthesized view is calculated with original view as a reference, no quality improvement is observed when increasing bitrate from 3 Mbps to 6Mbps in terms of PSNR, PSNR (pspnr) and PSPNR. • Quality of synthesized views (PSNR as well as PSPNR) increases, when measured with reference synthesized from uncompressed data in the similar way as for 2D sequences – approximately constant increase of quality for increase of bitrate by a factor of two.

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