关键词: 误差掩盖, 运动矢量, 选择性恢复, 后处理

Abstract:

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 bloc k are se-lected,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 diferent rates of lost block or different video sequences.

Key words: error concealment, motion vector, selective recovery, post-processing