A Fast CU Size Decision Algorithm for the HEVC Intra Encoder
A Fast CU Size Decision Algorithm for the HEVC Intra Encoder
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DOI：
10.1109/tcsvt.2014.2363739
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发表时间：
2015-05-01
影响因子：
8.4
通讯作者：
Cheung, Ray C. C.
中科院分区：
文献类型：
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作者：
Min, Biao;Cheung, Ray C. C.
帧内编码在高效视频编码（HEVC）标准中起着至关重要的作用。它提供了更高的编码效率比以前的标准，H. 264/高级视频编码。HEVC中的块分割支持从大小64 x64到8x8的基于四叉树的编码单元（CU）结构。新技术一方面提供了更好的性能，但另一方面也增加了编码复杂度。本文提出了一种新的帧内编码中CU尺寸快速确定算法。提出了水平、垂直、45度对角线和135度对角线方向的全局和局部边缘复杂度，并将其用于决定CU的分区。结合以相同方式处置其四个子CU，针对每一深度决定CU为分裂、非分裂或未确定的。与参考软件HM10.0相比，编码时间平均减少了约52%，Bjontegaard失真率增加了约0.8%，峰值信噪比损失合理。
Intra coding plays a crucial role in the High Efficiency Video Coding (HEVC) standard. It provides the higher coding efficiency than the previous standard, H.264/Advanced Video Coding. The block partitioning in HEVC supports quad-tree-based coding unit (CU) structure from size 64x64 to 8x8. The new technique provides better performances on one hand, whereas on the other hand it also increases the coding complexity. In this paper, a novel fast algorithm is proposed for the CU size decision in intra coding. Both the global and local edge complexities in horizontal, vertical, 45 degrees diagonal, and 135 degrees diagonal directions are proposed and used to decide the partitioning of a CU. Coupled with handling its four sub-CUs in the same way, a CU is decided to be split, nonsplit, or undetermined for each depth. Compared with the reference software HM10.0, the encoding time is reduced by similar to 52% on average, with similar to 0.8% Bjontegaard Distortion-rate increasing and reasonable peak signal-to-noise ratio losses.