Fast Algorithm with Early Termination CU Split and Mode Decision
Fast Algorithm with Early Termination CU Split and Mode Decision
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DOI：
10.14257/ijca.2015.8.2.09
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发表时间：
2015-02
期刊：
影响因子：
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通讯作者：
Yong Gan;Xiao-Wei Zhao;Qiuwen Zhang
中科院分区：
文献类型：
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作者：
Yong Gan;Xiao-Wei Zhao;Qiuwen Zhang
HEVC （High Efficiency Video Coding）是新一代视频编码标准，它引入了树形结构编码单元和多种帧内预测模式等新技术。与H.264/AVC相比，HEVC实现了更高的编码效率，但对计算复杂度的要求非常高。为此，本文提出了一种通过提前终止编码单元分割和模式判定的快速算法。在研究图像特征的基础上，利用输入图像的方差提前终止CU分割。此外，在对粗模态决策得到的候选模态进行分析的基础上，采用相邻模态提前终止RDO过程，降低了计算复杂度。实验结果表明，在忽略编码性能下降的情况下，该算法平均节省约40%的编码时间。
HEVC (High Efficiency Video Coding) is the next-generation video coding standard, which introduced many new technologies such as tree structure coding unit and a variety of intra prediction mode. Compared with H.264/AVC, HEVC has achieved higher coding efficiency but requires a very high computational complexity. So this paper proposes a fast algorithm through early termination of the CU (Coding Unit) splitting and mode decision. Based on the research of image features, we use the variance of the input image to early terminate CU splitting. In addition, based on the analysis of candidate modes which were obtained by the rough mode decision, the adjacent mode is used to early terminate the RDO process to reduce the computational complexity. The experimental results show that the proposed algorithm saves averagely about 40% of encoding time with neglecting degradation of coding performance.