콘텐츠 본문
논문 국내 국내전문학술지(KCI급) Residual DPCM in HEVC Transform Skip Mode for Screen Content Coding
- 학술지 구분 국내전문학술지(KCI급)
- 게재년월 2016-10
- 저자명 Chan-Hee Han, Si-Woong Lee, and Haechul Choi
- 학술지명 IEIE Transactions on Smart Processing and Computing
- 발행처명 대한전자공학회
- 발행국가 국내
- 논문언어 외국어
- 전체저자수 3
논문 초록 (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.
