Low complexity encoder optimization for HEVC
Low complexity encoder optimization for HEVC
复制标题
HEVC 的低复杂度编码器优化
DOI：
10.1016/j.jvcir.2015.12.005
复制
发表时间：
2016-02-01
影响因子：
2.6
通讯作者：
Gao, Wen
中科院分区：
文献类型：
--
作者：
Wang, Shanshe;Luo, Falei;Gao, Wen
高效视频编码（High Efficiency Video Coding， HEVC）显著提高了编码效率。与之前的H.264/AVC相比，它可以提供同等的主观质量，比特率降低57%以上。然而，编码效率的提高是以更高的计算复杂度为代价的。本文在全面分析HEVC编码器计算复杂度的基础上，从帧内预测模式决策、提前终止编码单元（CU）分裂和自适应参考帧选择等方面，减少可评估候选数，提出了一种低复杂度编码器优化方案。该方案能够以低复杂度的方式实现HEVC的码率失真优化（RDO）技术。实验结果表明，与原始HEVC参考编码器实现相比，本文提出的优化方案平均可将复杂度降低40%以上，而编码性能的下降仅为0.43%，可以忽略不计。(C) 2015爱思唯尔公司版权所有。
High Efficiency Video Coding (HEVC) improved the coding efficiency significantly. Compared to its predecessor H.264/AVC, it can provide equivalent subjective quality with more than 57% bit rate reduction. However, the improvement on coding efficiency is obtained at the expense of much more intensive computation complexity. In this paper, based on an overall analysis of computation complexity at the HEVC encoder, a low complexity encoder optimization scheme is proposed by reducing the number of available candidates for evaluation in terms of the intra prediction mode decision, early termination of coding unit (CU) splitting and adaptive reference frame selection. With the proposed scheme, the rate distortion optimization (RDO) technique of HEVC can be implemented in a low-complexity way for complexity constrained encoders. Experimental results demonstrate that, compared with the original HEVC reference encoder implementation, the proposed optimization scheme can achieve more than 40% complexity reduction on average with coding performance degradation as only 0.43% which can be ignorable. (C) 2015 Elsevier Inc. All rights reserved.