Study Of Error Concealment Technology In The H.264/AVC Video Coding Standard

With the wide application of the stream media technology, the stream media application in various fields put forward new request toward video codes. It requires not only transferring video by low code radio, namely high compression, but also acquiring well-qualified video picture. The H.264 video frequency codes standard which has high compression and matches to network is more and more popular. Therefore, it will be the main development direction of video frequency code in the future. However, the code flow of H.264 code maybe appear mistake code or throw a pack unavoidably when they were transferred at the network. Because of H.264 standard take mode of Intra and Inter prediction coding, the mistake code may produce error transformation, and make following block and frame decoding failure. One kind of solving methods may be error concealment.We have studied the key technique of H.264 video frequency code standard: Intra predict, Inter predict, SP/SI, integral transformation, entropy coding, FMO etc, and researched into the new tendency of each technology and the functions of error correction, from which the most new developments of techniques and core technique's function to error concealment are illustrated, current error concealment technology of video code is explored, and the error concealment method of H.264 code standard is analyzed. On the base of those studies, an improvement method to error concealment of H.264 is put forward. Because of H.264's code is consisted of Intra frame and Inter frame, there are different analytical methods for each kind of frame. To Intra frame, we need to analyze the smooth between mistake block and neighbor edge, and the prediction difference between current frames of mistake block and previously frame, and then compare their value in order to decide which kind of method will be taken; To Inter frame, we need to take use of the time relativity to conceal error.Based on JM experiment model, we are experiment the improved concealment method with video frequency array brought forward by the paper, and analyze and compare experiment results. Furthermore, it is valued and analyzed by video frequency mass valuation standard. At last, the improvement can be seen between improved method and H.264 code itself error concealment.