Research Of Error Resilience Technology For Video Communication Based On H.263 Codec

RESEARCH OF ERROR RESILIENCETECHNOLOGY FOR VIDEO COMMUNICATION BASED ON H.263CODECMajor: Signal and Information Processing Data: Author: Meng Yan Signature:Tutor: Zhang Erhu Liu Shichang Signature:ABSTRACTThe reconstructed image quality can be degraded substantially by errors during the transmitting over the communication channel, especially when the video is compressed by temporal and spatial coding ways, which leads to error propagation in frame sequence, so the error resilience procedure should be performed to improve the reconstruction quality. This thesis discusses the research status and typical algorithms of error resilience at home and abroad, whose performance are analyzed, too. The error resilience technology means that the decoder can detect errors, skip the inextricable errors, and rectify the errors as soon as possible, one important way of which is error concealment. Recovering the video quality by temporal compensation and spatial interpolation is the basic principle, and the error concealing process includes the detecting, and the binding, and the synchronizing, and the data recovering. Based on the one and a half year' s lucubration, the author gets one new error concealment way with better combination between efficiency and running time in processing the errors in video communication.According to the experiment results and relative data analysis, we can get a certain conclusion, which is that the algorithms are correct and useful. At present, mobile video communication and IP video communication are future market goals for most companies in the communication field. At the same time, the error resilience technology is one of the keys in realizing a video communication system. So, you can see, the work of this thesis is meaningful and valuable.