Residual DPCM in HEVC Transform Skip Mode for Screen Content Coding

다국어 초록 (Multilingual Abstract)

High Efficiency Video Coding (HEVC) adopts intra transform skip mode, in which a residual block is directly quantized in the pixel domain without transforming the block into the frequency domain. Intra transform skip mode provides a significant coding gain for screen content. However, when intra-prediction errors are not transformed, the errors are often correlated along the intra-prediction direction. This paper introduces a residual differential pulse code modulation (DPCM) method for the intra-predicted and transform-skipped blocks to remove redundancy. The proposed method performs pixel-by-pixel residual prediction along the intra-prediction direction to reduce the dynamic range of intra-prediction errors. Experimental results show that the transform skip mode’s Bjøntegaard delta rate (BD-rate) is improved by 12.8% for vertically intra-predicted blocks. Overall, the proposed method shows an average 1.2% reduction in BD-rate, relative to HEVC, with negligible computational complexity.

목차 (Table of Contents)

• Abstract
• 1. Introduction
• 2. Residual DPCM for the Intra Transform Skip Mode
• 3. Experimental Results
• 4. Conclusion
• References

참고문헌 (Reference)

1 C. Lan, "Screen content coding" 2010

2 C. Lan, "Intra transform skipping" 2012

3 J. Lainema, "Intra coding of the HEVC standard" 22 (22): 1792-1801, 2012

4 "High Efficiency Video Coding Test Model Software 16.6"

5 Joint Collaborative Team on Video Coding, "High Efficiency Video Coding (HEVC) text specification draft 10 (for FDIS & Consent)" 2013

6 F. Bossen, "Common HM test conditions and software reference configurations" 2013

7 P. Onno, "Combination of J0171 and J0389for the non-normative encoder selection of the intra transform skip" 2012