ERROR-PROPAGATION REDUCTION IN A BALANCED MULTIPLE DESCRIPTION VIDEO CODER (MA-L5)

Author(s) : Marco Fumagalli (Cefriel - Politecnico di Milano, Italy) Nicola Franchi (CEFRIEL, Italy) Rosa Lancini (CEFRIEL, Italy)

Abstract : Compressed video streams are very exposed to channel losses when they are transmitted through an unreliable network. The predictive encoding scheme is efficient but even a single packet loss can cause decoding error propagation through all the frames following the erasure. An error-resilience approach to tackle this problem is the multiple description coding (MDC) technique. Another important issue connected to this approach is the problem of error-concealment (EC) in order to reconstruct the information lost during the transmission. In this paper we deal with sequence-based EC algorithm that performs the error-concealment by using the information coming from a certain number of frames in the future to minimize the effect of error propagation. Target of this work is applying such EC strategy to a balanced MDC system. Simulation results show the great improvement that a sequence-based EC algorithm can give compared to classical EC approaches.

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