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Statistical Characteristics of Simple Wyner-Ziv Frames

Statistical Characteristics of Simple Wyner-Ziv Frames. Jin-soo KIM. Contents. Simple Stat. Char.s of Wyner-Ziv Frames Statistical Characteristics of Simple Frame Difference DCT Coefficients for Simple Frame Difference Spatial Reduction for WZ Encoder

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Statistical Characteristics of Simple Wyner-Ziv Frames

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  1. Statistical Characteristics of Simple Wyner-Ziv Frames Jin-soo KIM

  2. Contents • Simple Stat. Char.s of Wyner-Ziv Frames • Statistical Characteristics of Simple Frame Difference • DCT Coefficients for Simple Frame Difference • Spatial Reduction for WZ Encoder • Spatial Reduction and DCT for WZ Encoder • Research Plan • Q&A

  3. Statistical Characteristics of Simple Frame Difference

  4. Simple Frame Difference for WZ frames I wz I wz I wz I 1 2 3 4 Encoder Side I wz I Recon. Residual signal WZ Encoder Residual signal - Encoded bit stream = Side Information MCFI WZ Decoder 1 2 3 Decoder Side [Aaron, Zhang, Girod, Asilomar 2002]

  5. Frame Difference for Simple WZ wz I wz I wz I I Residual signal

  6. Statistical Distribution Luma

  7. Standard Deviations for Simple FD 300 Frames @ CIF, 30Hz Foreman: Luma's STD = 16.5, Chroma's STD = 3.4, Y/C entropy=5.2, 1.9bits/pel Coastguard: Luma's STD = 16.4, Chroma's STD = 1.6, Y/C entropy=5.7, 1.6bits/pel Stefan: Luma's STD = 35.6, Chroma's STD = 7.4, Y/C entropy=6.2, 2.7bits/pel Akiyo: Luma's STD = 2.8, Chroma's STD = 0.6, Y/C entropy=1.69, 1.0bits/pel

  8. DCT Coefficients for Simple Frame Difference

  9. Frame Difference for Simple WZ I wz I wz I wz I Residual signal wz 8x8 DCT [Aaron, Zhang, Girod, Asilomar 2003]

  10. Std Dev of DCT Coeff For Simple FD Std. dev. DCT coeff. in zig-zag scan order

  11. Spatial Reduction for WZ Encoder

  12. Blk Diagram for Spatial Reduction WZ Enc. Rec. Frame store (Key frames) 2:1 decimation LR bit stream Current frame (WZ frame) Regular Frame Coder (ex. H.264) 2:1 decimation 2:1 interpolation - + + Residual signal

  13. Block Diagram for Simulation - = Residual signal LPF & 2:1 decimation 2:1 interploation & LPF Integer Quant

  14. Std Dev for Residual Signal 300 Frames @ CIF, 30Hz Foreman: Luma's STD = 16.5, Chroma's STD = 3.4, Y/C entropy=5.2, 1.9bits/pel Foreman: Luma's STD = 9.1, Chroma's STD = 1.0, Y/C entropy=3.8, 0.5bits/pel Coastguard: Luma's STD = 16.4, Chroma's STD = 1.6, Y/C entropy=5.7, 1.6bits/pel Coastguard: Luma's STD = 10.4, Chroma's STD = 1.6, Y/C entropy=4.8, 1.0bits/pel Stefan: Luma's STD var = 35.6, Chroma's STD = 7.4, Y/C entropy=6.2, 2.7bits/pel Stefan: Luma's STD = 12.1, Chroma's STD = 1.0, Y/C entropy=4.7, 0.5bits/pel

  15. Spatial Reduction and DCT for WZ Encoder

  16. Spatial Reduction and DCT for WZ Enc. Rec. Frame store 2:1 decimation LR bit stream Current frame Regular Frame Coder (ex. H.264) 2:1 decimation 2:1 interpolation - + + Residual signal DCT [HP report by Mukherjee, Machiavello, Queiroz, 2007]

  17. Std Dev of DCT Coeff For Spatial Reduction Std. dev. DCT coeff. in zig-zag scan order

  18. Comparison of DCT and DCT+Spatial Reduction Std. dev. DCT coeff. in zig-zag scan order

  19. Conclusion • Need to find an efficient statistical model for the residual signal • Need to look for entropy coding based on the trade-off between computational complexity and R-D performance • Need to implement the channel encoding/decoding algorithm • Need to develop an effective reconstruction scheme for side information

  20. Research Plan (with M.S. Vidhya Murthy)

  21. Research Plan Plan ■ Planand achievements done Now

  22. Q&A Thank you

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