A feedback channel based error compensation method for mobile video communications using H.253 standard

This study aims at finding an efficient compensation method of transmission errors in low bit-rate mobile communications using the H.263 video codec. For this aim, we suggest a novel error compensation method in the encoder (or transmitter), that can remove visual quality degradation due to spatio temporal error propagation by utilizing a feedback channel. In the proposed method, a corrupted-group of blocks (GOB) is concealed to avoid annoying artifacts due to the bit-error, and the GOB and its corresponding frame number are reported to the encoder via the feedback channel. Then, the encoder evaluates the negative acknowledgments and reconstructs the spatial and temporal error propagation by using a novel fast redecoding algorithm. The proposed error compensation method is compared with the two existing ones: the reference picture selection method and the error tracking method. Experimental results show that the proposed method is superior to the existing ones in many aspects.