%0 Journal Article
%T Motion Vector Composition Algorithm Based on Accuracy for Reduced Spatial Resolution Video Transcoding<br>一种基于精确度的降分辨率视频转码运动矢量合成算法
%A HAN Zhen
%A HU Rui-min
%A CHEN Hao
%A LI Ming
%A <br>韩镇
%A 胡瑞敏
%A 陈皓
%A 李明
%J 中国图象图形学报
%D 2010
%I 
%X The current motion vector composition algorithms for reduced spatial resolution video transcoding does not consider the accuracy of input motion vectors. So the errors of these algorithms are rather big. In order to solve this problem, this paper proposes a motion vector composition algorithm based on the accuracy for reduced spatial resolution video transcoding. This algorithm includes two compositions. Firstly, it composes the input motion vectors by averaging them based on SAD. Secondly, it composes the neighboring motion vectors and composed motion vector in the first composition by selecting them based on rate distortion function. The simulation results show that the proposed algorithm reduces the error compared with the algorithms while maintaining the low complexity.
%K wavelet transform
%K mirror-symmetric extension
%K biorthogonal wavelet
%K Mallat algorithm<br>降分辨率转码
%K 运动矢量合成
%K 精确度
%K 绝对差值和
%K 率失真函数
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=D06194629680C940ACE75262F54B9D85&aid=B87148FC52B01B4BF70969E1623AE32B&yid=140ECF96957D60B2&vid=23CCDDCD68FFCC2F&iid=CA4FD0336C81A37A&sid=DF92D298D3FF1E6E&eid=F3583C8E78166B9E&journal_id=1006-8961&journal_name=中国图象图形学报&referenced_num=1&reference_num=8