Refinement of the pixel-based motion vector extrapolation in H.264 video

In video communications, the compressed video stream is very likely to be corrupted by channel errors. Recently, many error concealment algorithms have been proposed in order to combat channel errors. In this paper, we have combined two state-of-the-art motion vector recovery algorithms into a even better algorithm; we have modified the hybrid motion vector extrapolation (HMVE) algorithm and further improved the accuracy of the derived motion vectors by pixel-based MV correction using neighboring received MVs. Experimental results show that this method is able to provide better performance than existing algorithms subjectively and objectively.