误差掩盖中的选择性运动矢量恢复  

Selective Recovery of Motion Vectors in Error Concealment

作　　者：周智恒[1] 谢胜利[1] 

机构地区：[1]华南理工大学电子与信息学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2005年第7期11-14,共4页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60274006);国家杰出青年科学基金资助项目(60325310);教育部跨世纪优秀人才基金资助项目;广东省自然科学基金资助项目(020826);广东省自然科学团队研究项目(04205783)

摘　　要：提出了一种误差掩盖算法,作为在解码器端的后处理工具,以恢复视频序列在传输过程中丢失的运动矢量和图像块.对于丢失块,以其邻域块内像素标准差作为判断纹理块或平滑块的标准,选择保留所有属于纹理块的邻域块的运动矢量,取其中间值作为丢失块运动矢量的估计.仿真结果表明,对不同块丢失率或不同视频序列,该算法都能比传统的算法恢复出更高质量的图像.An error concealment algorithm is proposed as a post-processing tool at the decoder side, with the aim of recovering the motion vectors and image blocks lost during the video sequence transmission. For a lost block, the standard deviation of its neighboring blocks is first taken as the measurement to judge whether the block is a texture block or a smooth block. Next, all motion vectors of the neighboring blocks belonging to the texture block are selected, whose median value are then used to estimate the motion vectors of the lost blocks. Simulated results show that, compared with the existing traditional algorithms, the proposed algorithm can recover images with higher qua-(lity) in different rates of lost block or different video sequences.

关 键 词：误差掩盖 运动矢量 选择性恢复 后处理 

分 类 号：TN919.8[电子电信—通信与信息系统]