Error concealment methods, a comparative study

A serious problem that arises in transmission of compressed image and video data over band-limited channels is due to the fact that the encoded bit stream is vulnerable to transmission errors. This may cause the loss of blocks of data. Error concealment methods intend to conceal the effects of data block loss by restoring the lost information. Restoration of lost pixels in an image or video is known to be an ill-posed problem. Error concealment methods solve this problem by introducing assumptions. Different researchers have made different assumptions about the image and video signals. Depending on these assumptions or how they are interpreted, different concealment methods have been proposed. In this paper, we report on the different error concealment methods suggested in the literature and compare their a-priori assumptions, performances and complexities.

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