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Progressive Image Transmission Based on Joint Source-Channel Decoding Using Adaptive Sum-Product Algorithm

EURASIP Journal on Image and Video Processing volume 2007, Article number: 069805 (2007) Cite this article

Abstract

A joint source-channel decoding method is designed to accelerate the iterative log-domain sum-product decoding procedure of LDPC codes as well as to improve the reconstructed image quality. Error resilience modes are used in the JPEG2000 source codec making it possible to provide useful source decoded information to the channel decoder. After each iteration, a tentative decoding is made and the channel decoded bits are then sent to the JPEG2000 decoder. The positions of bits belonging to error-free coding passes are then fed back to the channel decoder. The log-likelihood ratios (LLRs) of these bits are then modified by a weighting factor for the next iteration. By observing the statistics of the decoding procedure, the weighting factor is designed as a function of the channel condition. Results show that the proposed joint decoding methods can greatly reduce the number of iterations, and thereby reduce the decoding delay considerably. At the same time, this method always outperforms the nonsource controlled decoding method by up to 3 dB in terms of PSNR.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA

    Weiliang Liu & DavidG Daut

  2. Qualcomm Inc., San Diego, CA, 92121, USA

    Weiliang Liu

Authors
  1. Weiliang Liu
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  2. DavidG Daut
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Correspondence to Weiliang Liu.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Liu, W., Daut, D. Progressive Image Transmission Based on Joint Source-Channel Decoding Using Adaptive Sum-Product Algorithm. J Image Video Proc 2007, 069805 (2007). https://doi.org/10.1155/2007/69805

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  • DOI: https://doi.org/10.1155/2007/69805

Keywords

  • Weighting Factor
  • LDPC Code
  • Decode Method
  • Decode Procedure
  • Error Resilience