Error concealment of video based on motion estimation

When compressed video is transmitted over practical communication channels, there are error bits or loss packets. Especially, even if there is a few errors in an intra-frame, it can propagate both in spatial and temporal largely. In order to improve the image quality of decoding, the error concealment in the decoding side is necessary. In this paper, a damaged macroblock of the luminance component is separated into four sub-blocks. The motion vector of each sub-block is assumed to be the motion vector of the corneous region which nearest the sub-block. Finally, the overlapped motion compensation is employed to further improve the error concealment. The scheme is also used to conceal the error of the inter-frame. The simulation results show that it is effective. Compared with the conventional schemes, the concealment average peak signal-to-noise ratio is increased about 2dB at 5% and 10% loss rate of macro block.