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Short Distance Intra Coding Scheme for High Efficiency Video Coding

Short Distance Intra Coding Scheme for High Efficiency Video Coding. Xiaoran Cao, Changcai Lai, Yunfei Wang, Lingzhi Liu , Jianhua Zheng , and Yun He, Senior Member, IEEE. IEEE Transaction on Image Processing, Vol. 22, No. 2, February 2013. Pete Liu. Outline. Overview

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Short Distance Intra Coding Scheme for High Efficiency Video Coding

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  1. Short Distance Intra Coding Scheme for High Efficiency Video Coding • Xiaoran Cao, Changcai Lai, Yunfei Wang, Lingzhi Liu,JianhuaZheng, and Yun He, Senior Member, IEEE IEEE Transaction on Image Processing, Vol. 22, No. 2, February 2013 • Pete Liu

  2. Outline • Overview • Introduction • Analysis of directional prediction • Proposed methods • Experimental results • Conclusion

  3. Overview • The goal of this paper • Bitrate reducing • PSNR gain • However, the complexity will be quite high. • Double time in encoding.

  4. Introduction #1 • Partition mode in intra • N x N • 4N + 1 pixels are used

  5. Introduction #2 • Partition mode

  6. Introduction #3 • Transform Unit

  7. Analysis of directional prediction #1 • Image correlation model [25] • 123 • Prediction error residual • 123

  8. Analysis of directional prediction #2 • The covariance of prediction error • 123

  9. Analysis of directional prediction #3 • When • 123 • And the variance of eijcan be derived directly • 123

  10. Analysis of directional prediction #4 • There are three conditions • 123 • 123 • 123 • If = 0.95 0.72 0.45 0.29

  11. Analysis of directional prediction #5 • It is necessary to consider the transform process. • 123 • 123 • We obtain MSE • 123

  12. Analysis of directional prediction #6

  13. Proposed methods #1 • In the proposed SDIP scheme (CU)

  14. Proposed methods #2 • In the proposed SDIP scheme (TU)

  15. Proposed methods #3 • The non-square block size range

  16. Proposed methods #4 • Intra Prediction of Nonsquare Unit • 2(M+N)+1 pixels are needed • Main two stages • Do intra prediction with Hadamard transform replacing DCT and entropy coding is skip. The RD cost is calculated by SAD of the transformed block and the bits for coding the intra prediction mode. The modes with smaller RD costs are selected into a candidate list. • Full RDO process is carried out to the candidate list.

  17. Proposed methods #5 • Transform and Entropy Coding • DCT/DST • Zig-Zag

  18. Experiment results #1

  19. Experiment results #2

  20. Experiment results #3

  21. Experiment results #4

  22. Experiment results #5

  23. Experiment results #6

  24. Experiment results #7

  25. Experiment results #8

  26. Experiment results #9

  27. Experiment results #10

  28. Conclusion • Nonsquare split method can improve the prediction accuracy and therefore improve the coding efficiency. • High timing-cost

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