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- Title
面向 HEVC 的 Golomb-Rice 编码参数自适应策略.
- Authors
夏德春; 何小海; 韩兴阳; 叶宇昀; 吴小强
- Abstract
In order to further reduce high efficiency video coding(HEVC) output rate, this paper presents an improved algorithm of Context-based Adaptive Arithmetic Coding(CABAC). Firstly, by using the feature that the large size transform unit(TU) and the transform skip mode coefficient block has more large coefficients in CABAC, according to the distribution characteristics of the coded 4×4 coefficients array(CG) in 32×32 transform unit, the initial Golomb-Rice parameter of the next CG is adaptively determined. Then, in the transform skip mode coefficient block, the initial Golomb-Rice parameter is set to 1, and then the coding parameter of the next coefficient is adaptively determined according to the absolute value of the coded coefficients. The experimental results show that, compared with the HEVC standard algorithm HM16.0, the proposed algorithm brings down the bit rate by 0.09%~2.75%, the average efficiency is more than 90%, peak signal-to-noise ratio(PSNR) has no loss and coding time is only increased by 0.08%. Compared with the representative literature, the proposed algorithm can save the average bit rate by 0.49%, and PSNR is increased by an average of 0.01 dB.
- Publication
Telecommunication Engineering, 2017, Vol 57, Issue 10, p1218
- ISSN
1001-893X
- Publication type
Article
- DOI
10.3969/j.issn.1001-893x.2017.10.019