Trellis decoding for MPEG-4 streams over wireless channels

Qingyu Chen, K. P. Subbalakshmi

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations

Abstract

Most video coding standards, including MPEG-4, use variable length codes to encode the discrete cosine transform (DCT) coefficients of intra frames and inter frames, and the motion vector information. Although variable length codes can achieve good compression, they are very sensitive to channel errors, especially in wireless channels, which are characterized by bursty errors. Joint source-channel decoding (JSCD) is emerging as a potential alternative to traditional error resilience methods for dealing with this sensitivity to channel errors. This paper describes one such JSCD for the reliable transmission of MPEG-4 video over wireless channels. We apply the maximum a posteriori probability based JSCD developed for first order Markov sources1 to both inter and intra coded macroblocks. Experiments indicate that the proposed decoder gives significant improvements (9 dB in some cases) for MPEG-4 video with error resilience at various channel error rates.

Original languageEnglish
Pages (from-to)810-819
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5022 II
DOIs
StatePublished - 2003
EventImage and Video Communications and Processing 2003 - Santa Clara, CA, United States
Duration: 21 Jan 200324 Jan 2003

Keywords

  • Error-resilient multimedia communication
  • Joint source-channel coding
  • MPEG-4 video over wireless channels
  • Multimedia over wireless networks

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