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Fast intra coding based on CU size decision and direction mode decision for HEVC

机译:基于CU大小决策和方向模式决策的HEVC快速帧内编码

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摘要

High Efficiency Video Coding (HEVC) adopts a quad-tree structured coding unit (CU) and more prediction unit (PU) modes are used in all CU depth levels. These improvements bring better coding performance, but the exhaustive search process for optimal CU and PU selection causes higher computational complexity than earlier standards. To speed up the encoder, this paper proposes a fast intra coding algorithm. Firstly, a fast CU size decision method is introduced, which selects different depth decision methods for each largest coding unit. Secondly, a fast direction mode decision method is proposed. It first compares the direction modes of the parent unit and most probable modes (MPMs) list, and then the first direction mode of rate-distortion optimization (RDO) list is used to early terminate the RDO process. Experimental results show that compared with HM 10.0, the proposed algorithm achieves 47% time reduction, whereas the value of BDBR is only 0.7%.
机译:高效视频编码(HEVC)采用四叉树结构编码单元(CU),并且在所有CU深度级别中都使用了更多的预测单元(PU)模式。这些改进带来了更好的编码性能,但是与早期标准相比,用于最佳CU和PU选择的详尽搜索过程导致更高的计算复杂性。为了加快编码器的速度,本文提出了一种快速的帧内编码算法。首先,介绍了一种快速的CU大小确定方法,该方法为每个最大编码单元选择不同的深度确定方法。其次,提出了一种快速方向模式决策方法。它首先比较父单元的方向模式和最可能的模式(MPM)列表,然后使用率失真优化(RDO)列表的第一个方向模式来尽早终止RDO过程。实验结果表明,与HM 10.0相比,该算法可节省47%的时间,而BDBR的值仅为0.7%。

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