| Video communication is one of the most important applications in multimedia communication, but it is impossible to avoid transmission error as interruption and delay always happen in channel. Since highly compressed video information is very sensitive to interference, error resilience becomes significant in video transmission. Based on the analysis of video coding standard H.264, this paper mainly focuses on the post processing technique which is knows as error concealment. The major works finished are:Made an in-depth study of the error resilience tools in H.264 such as flexible macroblock order (FMO), parameter sets, data partition, and described different modes of FMO in detail.The framework of reference software JM is analyzed, and particularly introduced the error concealment module which is to be improved in this paper.Based on the research of many correlated work domestic and foreign, designed an algorithm aimed at improving the perceptual quality of recustruted video. Then the algorithm was introduced in theory and implemented on JM version 8.5.The improved scheme and the former one were compared based on the simulation test results on IP network and wireless channel, and the results were analyzed at length.According to the simulation tests, the scheme proposed by this paper achieved a better video quality and didn't increase the computing complexity too much. The average PSNR gained 1.5dB to 2dB in the experiments. Error concealment belongs to video post processing and it won't require additional channel bandwidth. As the hardware facilities developing rapidly nowadays, error concealment will become an efficient tool to obtain better reconstructed video quality. |
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