Low-Complexity Rate-Distortion Optimization Algorithms for HEVC Intra Prediction
Low-Complexity Rate-Distortion Optimization Algorithms for HEVC Intra Prediction
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DOI：
10.1007/978-3-319-04114-8_46
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发表时间：
2014-01
期刊：
影响因子：
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通讯作者：
Zhe Sheng;Dajiang Zhou;Heming Sun;S. Goto
中科院分区：
文献类型：
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作者：
Zhe Sheng;Dajiang Zhou;Heming Sun;S. Goto
HEVC相对于现有标准实现了更好的编码效率，但也涉及显著增加的复杂性。由于四叉树编码结构的高度灵活性和大量的预测模式，使得帧内预测的复杂度增加尤为明显，编码器采用率失真优化（RDO）来选择最优的编码模式。而且HEVC对RDO的依赖性比H.264/AVC更强。为了降低计算复杂度并实现实时系统，本文提出了两种低复杂度的HEVC帧内预测RDO算法。提出的率失真估计器简化了RDO的结构，并简化了一些硬件不友好的模块。与原始RDO过程相比，本文提出的两种算法在编码效率损失可接受的情况下，RDO时间分别减少了46%和64%。
HEVC achieves a better coding efficiency relative to prior standards, but also involves dramatically increased complexity. The complexity increase for intra prediction is especially intensive due to a highly flexible quad-tree coding structure and a large number of prediction modes.The encoder employs rate-distortion optimization (RDO) to select the optimal coding mode. And RDO takes a great portion of intra encoding complexity.Moreover HEVC has stronger dependency on RDO than H.264/AVC. To reduce the computational complexity and to implement a real-time system,this paper presents two low-complexity RDO algorithms for HEVC intra prediction. The structure of RDO is simplified by the proposed rate and distortion estimators, and some hardware-unfriendly modules are facilitated. Compared with the original RDO procedure, the two proposed algorithms reduce RDO time by 46% and 64% respectively with acceptable coding efficiency loss.