关键词: 差错掩盖, 模糊规则, 边缘检测, 运动矢量, 视频系列

Abstract:

An error concealment algorithm based on fuzzy edge detection is proposed as a tool at the decoder side to recover the image information lost during the video sequence transmission. For a lost block , a fuzzy edge detector is used to obtain the edge information on the boundary pixels of its four neighboring blocks. With the obtained edge information , an energy function for boundary matching error is constructed. Then , the motion vector corresponding to the minimum of the energy function is used as the estimation of motion vector of the lost block. Simulated results show that , as compared with the existing error concealment algorithms , the proposed algorithm can recover the image with higher quality in both subjective visual evaluation and objective numerical comparison.

Key words: error concealment, fuzzy rule, edge detection, motion vector, video sequence