摘要
视频压缩码流对于信道误码十分敏感,可导致重建图像质量严重下降,在接收端就要使用误码掩盖技术对损坏的视频进行掩藏。文中提出一种基于多参考帧的时域误码掩盖算法,首先计算受损宏块的相邻块的运动矢量的均值,然后遍历所有参考帧得到待选的误码掩盖宏块,最后用外边界匹配算法找出替代受损宏块的宏块。研究结果表明,该算法能更精确地恢复错误宏块的运动矢量,从而获得比传统的时域掩盖算法更好的视频质量。
Compressed video bitstream is sensitive to channel errors, which may degrade the reconstructed pictures severely, so error concealment is needed to mask damaged image at receivers. A temporal error coneealment based on multiple - reference is presented. With the average of the motion vectors of the adjacent blocks as an estimate of the lost motion vectors, the candidate lost blocks in all references are found, then the right blocks can he acquired by the boundary - matching algorithm. The algorithm can restore the lost motion vectors of error blocks more accurately thus achieving better video quality.
出处
《电子科技》
2007年第11期15-17,共3页
Electronic Science and Technology
关键词
误码掩盖
多参考帧
边界匹配
error concealment
multiple - reference
boundary - matching
