An efficient spatial error concealment for video transmission

The encoded bit streams of video transmitted in error-prone channels are vulnerable to transmission errors, which usually result in missing blocks at the decoder. In this paper, we propose an efficient spatial error concealment method for video transmission. The missing blocks are classified into uniform blocks and edge blocks by using the edge information extracted from the surrounding correctly received blocks. For the missing blocks, which are uniform blocks, it can be concealed by simple linear interpolation. For the missing edge blocks, the initial values of the missing blocks can be obtained by prediction based on gradient adaptive prediction (GAP). A maximum a posterior (MAP) method based on a Markov random field (MRF) model is used to implement the optimization with the initial values of the missing blocks. The experimental results demonstrate that the proposed algorithm can obtain excellent image quality, and then can be applied for real-time video transmission because of low computational complexity.