Error Concealment Techniques in Mpeg-2

The MPEG-2 compression algorithm, due to the use of variable length coding, is very sensitive to channel disturbances. A single bit error during transmission leads to noticeable degradation of the decoded sequence quality in that part or entire slice information is lost until the next resynchronization point is reached. Error concealment (EC) methods are employed at the decoder side to deal with this problem. A novel concealment scheme is proposed in this paper that uses spatial or, when available, temporal information to reconstruct the corrupted frames. The concealment strategy is embedded in the MPEG-2 decoder model to avoid further concealment of propagation errors. The proposed scheme is proved to be of better performance compared to that achieved by other error concealment (EC) methods. Furthermore, the quality of the concealed sequence seems to ameliorate with time.