Adaptive Fractional-Pixel Motion Estimation Skipped Algorithm for Efficient HEVC Motion Estimation
Adaptive Fractional-Pixel Motion Estimation Skipped Algorithm for Efficient HEVC Motion Estimation
复制标题
用于高效 HEVC 运动估计的自适应分数像素运动估计跳过算法
DOI：
10.1145/3159170
复制
发表时间：
2018-01-01
影响因子：
5.1
通讯作者：
Wang, Fu Lee
中科院分区：
文献类型：
--
作者：
Pan, Zhaoqing;Lei, Jianjun;Wang, Fu Lee
高效视频编码（HEVC）有效地解决了高清视频（特别是4K视频）的存储和传输问题。基于可变大小预测单元（PU）的运动估计（ME）为HEVC编码器贡献了显著的压缩率，并且还生成巨大的计算负载。同时，高水平的编码复杂度阻碍了HEVC编码器在多媒体系统中的广泛采用。本文针对低复杂度HEVC ME提出了一种自适应分数像素ME跳过方案。首先，根据基于可变大小PU的ME过程的特性和可变大小PU之间的视频内容划分关系，将编码单元编码过程中的所有PU间模式分为根型PU模式和子型PU模式。然后，根据根类型PU模式的ME结果，自适应地跳过其子类型PU模式的分数像素ME。仿真结果表明，与HEVC参考软件中的原始ME相比，该算法在保持编码效率性能的同时，平均减少了63.22%的ME编码时间。
High-Efficiency Video Coding (HEVC) efficiently addresses the storage and transmit problems of high-definition videos, especially for 4K videos. The variable-size Prediction Units (PUs)--based Motion Estimation (ME) contributes a significant compression rate to the HEVC encoder and also generates a huge computation load. Meanwhile, high-level encoding complexity prevents widespread adoption of the HEVC encoder in multimedia systems. In this article, an adaptive fractional-pixel ME skipped scheme is proposed for low-complexity HEVC ME. First, based on the property of the variable-size PUs--based ME process and the video content partition relationship among variable-size PUs, all inter-PU modes during a coding unit encoding process are classified into root-type PU mode and children-type PU modes. Then, according to the ME result of the root-type PU mode, the fractional-pixel ME of its children-type PU modes is adaptively skipped. Simulation results show that, compared to the original ME in HEVC reference software, the proposed algorithm reduces ME encoding time by an average of 63.22% while encoding efficiency performance is maintained.