快速运动估计的自适应十字形搜索的改进  

Improvement of ARPS Based on Fast Motion Estimation in Video Encoding

作　　者：李勇明[1] 王韬[1] 

机构地区：[1]重庆大学通信工程学院,重庆400044

出　　处：《计算机工程》2005年第8期177-179,共3页Computer Engineering

基　　金：重庆大学基础及应用基础研究基金资助项目(521-717411031);重庆大学学科建设基金资助项目(2003-005)

摘　　要：改善了ARP3-2的两个方面:一是计算预测矢量时,减少选取相邻块的数目,从而减少了相应的计算量;二是使十字形搜索形的4个方向的臂长都能随被搜索点的位置的变化而变化,使该搜索形比ARPS-2的搜索形在大小和方向上都具有更好的弹性,提出了一种更优的搜索算法N-ARPS。实验结果表明,在搜索代价上N-ARPS比ARPS-2明显好,而平均PSNR基本上与ARPS-2一致,在bit速率失真上较ARPS-2更接近FS,总的来说,性能较好。This paper improves the two aspects of ARPS-2 (I, when computing predicted vectors, reduces the numbers of adopted surrounding blocks so as to reduce computational cost; 2, makes the four arm lengths of the pattern vary with the position of searched points, and the pattern more elastic than ARPS-2 in size and direction), and thereby puts forward a better search algorithm N-ARPS. The experimental results show that N-ARPS is better than ARPS-2 on computational cost while it's average PSNR is the same as that of ARPS-2, and is closer to FS than ARPS-2 on bit rate distortion.

关 键 词：运动估计 ARPS-2 N-ARPS 臂长 

分 类 号：TN919.81[电子电信—通信与信息系统]