Short Distance Intra Coding Scheme for High Efficiency Video Coding

SHORT DISTANCE INTRA CODING SCHEME FOR HIGH EFFICIENCY VIDEO CODING

IEEE Transaction on Image Processing,

Vol. 22, No. 2, February 2013

Xiaoran Cao, Changcai Lai, Yunfei Wang, Lingzhi Liu, Jianhua Zheng, and Yun He, Senior Member, IEEE

Pete Liu

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OUTLINE

Overview Introduction Analysis of directional prediction Proposed methods Experimental results Conclusion

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OVERVIEW

The goal of this paper Bitrate reducing PSNR gain

However, the complexity will be quite high. Double time in encoding.

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INTRODUCTION #1

Partition mode in intra N x N 4N + 1 pixels are used

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INTRODUCTION #2

Partition mode

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INTRODUCTION #3

Transform Unit

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ANALYSIS OF DIRECTIONAL PREDICTION #1

Image correlation model [25] 123

Prediction error residual

123

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ANALYSIS OF DIRECTIONAL PREDICTION #2

The covariance of prediction error

123

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ANALYSIS OF DIRECTIONAL PREDICTION #3

When 123

And the variance of eij can be derived directly 123

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ANALYSIS OF DIRECTIONAL PREDICTION #4

There are three conditions

123

123

123

If = 0.95

0.72

0.45

0.29

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ANALYSIS OF DIRECTIONAL PREDICTION #5

It is necessary to consider the transform process. 123

123

We obtain MSE

123

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ANALYSIS OF DIRECTIONAL PREDICTION #6

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PROPOSED METHODS #1

In the proposed SDIP scheme (CU)

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PROPOSED METHODS #2

In the proposed SDIP scheme (TU)

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PROPOSED METHODS #3

The non-square block size range

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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.

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PROPOSED METHODS #5

Transform and Entropy Coding DCT/DST Zig-Zag

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EX

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RIM

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T R

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ULT

S #1

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EXPERIMENT RESULTS #2

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EXPERIMENT RESULTS #3

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EXPERIMENT RESULTS #4

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EXPERIMENT RESULTS #5

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EXPERIMENT RESULTS #6

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EXPERIMENT RESULTS #7

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EX

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RIM

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T R

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ULT

S #8

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EXPERIMENT RESULTS #9

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EXPERIMENT RESULTS #10

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CONCLUSION

Nonsquare split method can improve the prediction accuracy and therefore improve the coding efficiency.

High timing-cost