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Proceedings Paper

Software-embedded data retrieval and error concealment scheme for MPEG-2 video sequences
Author(s): Corinne Le Buhan Jordan
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Paper 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.

Paper Details

Date Published: 22 March 1996
PDF: 8 pages
Proc. SPIE 2668, Digital Video Compression: Algorithms and Technologies 1996, (22 March 1996); doi: 10.1117/12.235434
Show Author Affiliations
Corinne Le Buhan Jordan, Swiss Federal Institute of Technology (Switzerland)

Published in SPIE Proceedings Vol. 2668:
Digital Video Compression: Algorithms and Technologies 1996
Vasudev Bhaskaran; Frans Sijstermans; Sethuraman Panchanathan, Editor(s)

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