A new hybrid error concealment scheme for MPEG-2 video transmission

Absnuct-For entropy-coded MPEG2 video frames, a transmission error will not only affect the underlying codeword but also may affect subsequent codewords, resulting in a great degradation of the received video frames. In this study, transmission errors in MPEG2 video frames are first detected and located by the error detection scheme proposed by Shyu and Leou 161, and then the corrupted blocks are concealed by the proposed hybrid error concealment scheme. Based on the condition of a corrupted block, a corrupted block in an intracoded I frame is concealed by either the spatial error concealment algorithm in H.26L Test Model Long-Term Number 9 (TML-9) or the best neighborhood matching (BNM) algorithm followed by the proposed modified spatial anisotropic diflusion (SD) algorithm. A corrupted block in an inter-eoded P or B frame Is concealed by tbe proposed motion-eompensated BNM algorithm. Based on the simulation results obtained in this study, the proposed scheme can recover high-quality MPEG2 video frames from the corresponding corrupted video frames up to a bit error rate of 0.5%.