摘要： AVS是中国自主制定的音视频编码标准，在视频编码算法中采用子像素搜索方法，使搜索更精确、压缩效果更好，但算法复杂度较高。基于搜索点失真随着与全局最小点之间距离的增加而增大，以及运动矢量具有中心偏置的特性，该文提出一种三步快速子像素搜索算法。实验结果表明，该算法与标准算法相比，在保证视频质量基本不变的同时，复杂度降低了65%以上。

关键词: 音视频编码标准, 视频编码, 运动估计, 子像素搜索

Abstract: AVS is a domestic audio and video coding standard of China. In its video coding, sub-pixels search method is applied to achieve more accurate motion description and higher compression efficiency, with higher complexity. In order to reduce the complexity, a fast three step sub-pixels search algorithm is presented based on monotonous increase of the distortion of a search point with increasing distance from that search point to the Global Minimum Point(GMP), and the center-biased of motion vector. Simulation results show that the new algorithm can reduce computational complexity by more than 65% with little quality degradation.

Key words: Audio Video Coding Standard(AVS), video coding, motion estimation, sub-pixels search

中图分类号: 

• TN919.81