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Fast prediction mode selection and CU partition for HEVC intra coding
IET Image Processing ( IF 2.3 ) Pub Date : 2020-07-27 , DOI: 10.1049/iet-ipr.2019.0259
Bin Fu 1 , Qiangqing Zhang 1 , Jianling Hu 1
Affiliation  

Compared with the predecessor H.264/advanced video coding, high-efficiency video coding (HEVC) is a new video coding standard with nearly double coding efficiency under the same coding quality. However, the computing complexity of HEVC increases sharply. To solve this problem, a fast algorithm for intra prediction mode selection based on mode grouping is proposed by reducing the number of modes entering rough mode decision. Moreover, the dual support vector machine is proposed to efficiently select the coding unit (CU) size, which is based on texture features of CU and sub-CUs including content complexity and direction complexity. By using the new CU size selection algorithm, the encoder can confirm the split for complex CU and terminate the split for simple CU in advance, so as to reduce the computing complexity of CU size selection. The experimental results show that by employing the two fast algorithms in intra coding, it can save 42.80% encoding time, with 0.98% increment in bit rate and 0.018 dB loss of peak-signal-to-noise ratio of luminance, compared with the reference software x265-1.7.

中文翻译:

HEVC帧内编码的快速预测模式选择和CU分区

与以前的H.264 /高级视频编码相比,高效视频编码(HEVC)是一种新的视频编码标准,在相同的编码质量下,其编码效率几乎提高了一倍。但是,HEVC的计算复杂度急剧增加。为了解决这个问题,提出了一种基于模式分组的帧内预测模式选择快速算法,减少了进入粗模式决策的模式数量。此外,提出了双支持向量机以基于CU和子CU的纹理特征(包括内容复杂度和方向复杂度)有效地选择编码单元(CU)的大小。通过使用新的CU尺寸选择算法,编码器可以提前确认复杂CU的分割并终止简单CU的分割,以降低CU尺寸选择的计算复杂度。
更新日期:2020-07-28
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