用于AVS视频编码的三步快速子像素搜索算法  

Fast Three Step Sub-pixels Search Algorithm for AVS Video Coding

作　　者：陈永华[1] 王毅[1] 刘东华[2] 周经野[1] 

机构地区：[1]湘潭大学信息工程学院 [2]国防科技大学电子科学与工程学院,长沙410073

出　　处：《计算机工程》2008年第9期230-231,共2页Computer Engineering

基　　金：上海浦东2006年重大共性联合攻关基金资助项目(PKJ2006-203);湘潭大学博士启动基金资助项目(05QDZ23)

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。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.

关 键 词：音视频编码标准 视频编码 运动估计 子像素搜索 

分 类 号：TN919.81[电子电信—通信与信息系统]