An Error Concealment Algorithm in Wireless Networks

Compressed video sequences are very vulnerable to channel disturbances when transmitted through the burst-packet-loss wireless channels. Transmission errors not only corrupt the current frame, but may also propagate to succeeding frames. We find that a number of current proposed post-processing error concealment methods exploit the spatial/temporal redundancy in the video stream can not actually conceal the transmission errors effectively, because they ignored the fact that the neighboring blocks can be easily lost by the burst packet losses and the correlation was considered only in the current frame, which all limited the ability to obtain an optimal recovery. In this paper, a novel error concealment algorithm is proposed for video transmissions in a wireless environment. Our method is applicable to the wireless visual communications due to its low computational costs and acceptable image quality not only in the current decoded frame but also in the succeeding B and P frames that depend on the corrupted frame. Simulation proves that the proposed algorithm can be chosen as good trade-off between video quality and computational load in wireless networks.