Software-embedded data retrieval and error concealment scheme for MPEG-2 video sequences

Corinne Le Buhan Jordan

doi:10.1117/12.235434

22 March 1996 Software-embedded data retrieval and error concealment scheme for MPEG-2 video sequences

Corinne Le Buhan Jordan

Proceedings Volume 2668, Digital Video Compression: Algorithms and Technologies 1996; (1996) https://doi.org/10.1117/12.235434
Event: Electronic Imaging: Science and Technology, 1996, San Jose, CA, United States

Abstract

This paper considers the problem of data recovery and reconstruction in erroneous MPEG-2 video sequences. The basic resynchronization point in MPEG-2 video bitstream is the slice header, a slice usually denoting a full row of macroblocks. When an error occurs, the rest of the damaged slice is lost up to the next slice. In order to improve the efficiency of conventional error concealment schemes, we propose to exploit the error detection information to force the decoding of error-free bits immediately after a lost area, before reaching either the next resynchronization point or the next erroneous area. This early resynchronization is achieved by trying to decode variable length codes until some macroblocks are recognized. In order to retrieve differentially coded data such as DC coefficients and macroblocks positions, a specific algorithm has been designed which uses not only available AC coefficients and neighboring data, but also differential values decoded from the early-resynchronized bitstream. This algorithm has been embedded in an MPEG-2 software decoder, combined with classical spatial and temporal error concealment techniques to interpolate the remaining lost areas. Simulation results show that up to 70% of the lost macroblocks can be retrieved in an intraframe coded picture. This retrieval along with temporal propagation yields a gain of several dBs as well as a visual enhancement over the whole sequence.

Citation Download Citation

Corinne Le Buhan Jordan "Software-embedded data retrieval and error concealment scheme for MPEG-2 video sequences", Proc. SPIE 2668, Digital Video Compression: Algorithms and Technologies 1996, (22 March 1996); https://doi.org/10.1117/12.235434

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