一种基于UMHexagon S的改进算法  

Improved Motion Estimation Algorithm Based on UMHexagon S

作　　者：李新[1] 程大鹏[1] 周贤[1] 

机构地区：[1]中国电子科技集团公司第三十四研究所第四事业部,广西桂林541004

出　　处：《兰州交通大学学报》2016年第1期53-58,共6页Journal of Lanzhou Jiaotong University

摘　　要：本文讨论了UMHexagon S算法的优缺点,提出了一种快速自适应的六边形菱形搜索算法,该算法结合了运动矢量的中心偏置特性、视频的空间相关性和时间相关性.该算法改进了UMHexagon S算法的六边形模板,利用相邻块和前一帧的对应块的运动矢量来判断运动状态.仿真实验结果表明,与UMHexagon S算法相比,在信噪比和码率基本不变的前提下,本算法降低了29.328%的编码时间.The features of UMHexagon S algorithm are probed.Subsequently,a new algorithm is proposed which is called Fast Adaptive Hexagon Diamond Search（FAHDS）.The new algorithm borrows ideas from center-biased feature of motion vector,and space-correlated feature and timecorrelated feature of video.Furthermore,the hexagon template based on UMHexagon S is included in the new algorithm to judge motion state by using motion vectors of adjacent blocks and correlated blocks in previous frame.The simulation result shows that the new algorithm reduces 29.328% encoding time of UMHexagon S on the condition of the similar PSNR and bit rate.

关 键 词：H.264/AVC标准 UMHexagon S算法 运动估计 中心偏置 运动矢量 

分 类 号：TP399[自动化与计算机技术—计算机应用技术]