一种分级检索MPEG视频的方法  

A Hierarchical Retrieval Method for MPEG Video

作　　者：刘阳[1] 许松涛[1] 吴志美[1] 

机构地区：[1]中国科学院软件研究所,北京100080

出　　处：《软件学报》2003年第3期675-681,共7页Journal of Software

基　　金：Supported by the National Grand Fundamental Research 973 Program of China under Grant No.G1998030407 (国家重点基础研究发展规划(973)); the Foundation of Beijing Science Committee of China under Grant No.H011710010123 (北京科委基金)

摘　　要：视频检索是当前的一个研究热点.以前的检索方法大多在像素域中进行,需要较大的解码运算量;且不加区分地对所有视频片断采用统一的匹配算法,浪费了许多不必要的计算.提出了一种基于样本的分级检索MPEG视频的新方法:首先用I帧的dct_dc_size字段快速粗检,然后用断层摄影(tomography)法分析B帧运动矢量的时空分布特性以进一步缩小结果集,最后用DC图像的精确匹配方法验证检索结果.试验结果表明,本方法所需计算量较小,且可保证较高的检索精度.Video retrieval is a current hot research area. Most of the past algorithms are done in pixel domain, which need many decode calculations. What is more, the same matching algorithm is used to all the video clips in the same way, which wasts many unnecessary calculations. A new hierarchical retrieval method based on example video for MPEG video is proposed: firstly the dct_dc_size field in I frames is used to locate the suspected videos quickly, then the retrieval result scope can be further reduced by analyzing the spatiotemporal distribution of motion vector in B frames using tomography method, at last DC images precise matching analysis is used to validate the retrieval result. The experimental results show that this method needs a few calculations and has higher precision ratio.

关 键 词：分级检索 MPEG 视频检索 时空分析 DC图像 图像匹配 图像检索 多媒体 计算机 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TN919.81[自动化与计算机技术—计算机科学与技术]