| Summary: | 碩士 === 國立中正大學 === 資訊工程研究所 === 90 === For entropy-coded H.26L video frames, a transmission error in a codeword 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, an error resilient coding scheme for H.26L video transmission is proposed. The objective of the proposed scheme is to recover high-quality H.26L video frames from the corresponding corrupted frames.
At the encoder, for an H.26L intra-coded I frame, the important data (the MB type, the intra predictive modes, and the four quantized DC values for the Y component of four subblocks) for each macroblock are extracted and embedded into another (remote) macroblock(s) within the I frame and the next P frame by the proposed odd-even data embedding scheme for I frames. For an H.26L inter-coded P frame, the important data (the MB types, the modes of block size for inter-coded MBs, and the residual motion vector information) for each slice are extracted and embedded into the next frame by the proposed macroblock-interleaving slice-based embedding scheme for P frames. At the decoder, after all the corrupted macroblocks within an H.26L video frame are detected and located, if the important data for a corrupted macroblock can be extracted correctly, the extracted important data will facilitate the employed error concealment approach to conceal the corrupted macroblock; otherwise, the employed error concealment approach is simply used to conceal the corrupted macroblock. Based on the simulation results obtained in this study, the performance of the proposed scheme is better than that of seven existing approaches for comparison. The proposed scheme can recover high-quality H.26L video frames from the corresponding corrupted video frames up to a video packet loss rate of 30%.
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