一种用于MPEG2运动估计的八步搜索算法  

A New Eitht-Step Search(8ss) Algorithm for Motion Estimation in MPEG2

作　　者：骆立俊[1] 邹采荣[1] 何振亚[1] 

机构地区：[1]东南大学无线电工程系

出　　处：《信号处理》1998年第2期150-154,共5页Journal of Signal Processing

摘　　要：本文提出了一种用于MPEG2运动估计的八步搜索算法（8SS），它的搜索位移为（－16，＋15．5）。该算法由于利用了序列图象运动矢量的空间分布特性—中心偏置分布特性，可以明显地将搜索次数降低到（25－55）次。仿真表明这种算法减少了搜索范围和搜索次数，提高了搜索效率，并能给出更正确的运动矢量。本文还对几种不同的搜索算法在大范围搜索区域的性能进行了详细的比较。A new eitht-step search (8SS) algorithm that is used for motion estimation in MPEG2 is proposed in this paper, which the search displacements are between-16 to + 15.5. Based on the image sequence's spatial characteristics of center-biased motion vectors, this method can significantly reduces the search times to (25-55).Simulation results show that the proposed 8ss is efficient to reduce the search range and to increase the search effi ciency for more right motion vector. Comparisons of 8ss and other search algorthms that are used in wider search area are also given in detail.

关 键 词：运动估计 MPEG2 八步搜索算法 图象编码 

分 类 号：TN919.8[电子电信—通信与信息系统]