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 language | English |
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Pages (from-to) | 810-819 |
Number of pages | 10 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 5022 II |
DOIs | |
State | Published - 2003 |
Event | Image and Video Communications and Processing 2003 - Santa Clara, CA, United States Duration: 21 Jan 2003 → 24 Jan 2003 |
Keywords
- Error-resilient multimedia communication
- Joint source-channel coding
- MPEG-4 video over wireless channels
- Multimedia over wireless networks