一种用于移动可视电话编码的运动估计快速搜索算法  

A fast motion estimation algorithm for mobile videophone coding

作　　者：李强[1] 孙瑞杰[1] 于游[1] 李伟博[1] 

机构地区：[1]重庆邮电大学信号与信息处理重庆市重点实验室,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2011年第5期593-596,620,共5页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：信号与信息处理重庆市重点实验室建设项目(CSTC;2009CA2003);国家高技术研究发展计划("863"计划)(2009AA011302);重庆邮电大学自然科学基金(A2011-09)~~

摘　　要：针对移动通信系统中实时视频通信的特点,提出了一种适用于可视电话和视频会议的视频压缩编码运动估计算法。利用当前块的3种预测矢量判断当前块运动矢量的类型,根据当前块运动矢量类型和移动可视电话视频对象运动的特点采用不同的搜索策略进行运动估计。通过对4种不同类型的视频序列进行测试,其测试结果表明,该算法在保证图像主客观质量的前提下,有效地减少了运动估计的时间,提高了编码的实时性。According to the characteristic of real-time video communication in mobile communication system, a motion esti- mation algorithm for video compress coding that is applicable to video phone and video conference is presented. The paper judges the type of motion vector of the current block by using three predictive vectors of current block, and adopts different search strategy for motion estimation according to the type of motion vector of the current block and the feature that video objects move in mobile videophone. Through testing four different types of video sequences, the proposed algorithm effec- tively reduces motion estimation time, and improves real-time performance of encoder under the premise of subjective and objective quality of image.

关 键 词：实时视频通信 H.264 运动估计 预测矢量 匹配误差 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]