In this paper, the error concealment techniques as motion vector extrapolation (MVE), boundary matching (BM), side matching (SM), 16×16-MB-based and 8×8-block-based concealment are implemented and compared with feedback-based no waiting ARQ (NWARQ) error recovery technique. A new error concealment method using preprocessing (PREP) and search is proposed and implemented. This new method tries to use the information of surrounding MV as much as possible, and find a more precise motion vector using additional search processing in a search window centered by the estimated motion vector. Simulation results, based on JM1.4 codec of JVT, show that both NWARQ and PREP can significantly improve the reconstruction video quality. And the combined PREP, SEARCH and NWARQ techniques can greatly achieve improved performance. From the simulation results, the SM and 16×16-MB-based concealment methods show better performance than BM and 8×8-block-based concealment.
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