【摘要】 随着数字视频技术的广泛应用,实现各种视频编码格式之间转码的要求越来越迫.视频转码是数字媒体网络网关的关键技术.本文从DCT域视频转码的体系结构、关键技术及最优转码策略三个方面,介绍了现有的各种算法,分析和总结了各自的特点,提出了DCT域视频下采样帧内刷新体系结构和最优视频转码策略解的概念,并指出了下一步的研究方向.更多还原

【Abstract】 With widely applications of digital video,the requirement of video transcoding is very exigent.Video transcoding is defined as the conversion of one coded video format to another and becomes a key technique of digital multimedia network gateway.In this paper,a survey on video transcoding in DCT-domain,including several typical architectures,key techniques and an optimal transcoding strategy,and various existing algorithms to analyze their advantages and disadvantages respectively are presented.An intrablock refreshing architecture for reduced spatial resolution transcoding in DCT domain and a soluton of an optimal transcoding strategy are introduced.Several research aspects in the future are proposed.更多还原