Robust transmission of video sequence over noisy channel using parity-check motion vector

The motion compensation-discrete cosine transform (MC-DCT) coding is an eff icient compression technique for digital video sequence. However, the compr essed video signal is vulnerable to transmission errors over noisy channel. In this paper, we introduce a novel concept of parity-check motion vector (PMV) into the MC-DCT coder in order to improve its error robustness. By in serting the redundant PMV's systematically into the compressed bitstream, t he proposed algorithm is capable of recovering very severe transmission err ors, such as loss of an entire frame, in addition to detecting the errors e ffectively without requesting any information from external devices. The pr oposed algorithm is implemented based on the H.263 coder, and tested intens ively in a realistic error prone environment. It is shown that the proposed algorithm provides much better objective and subjective performances than the conventional H.263 coder in the error prone environment.