Iterative source-channel decoding for robust image transmission

Xiang, Wei and Pietrobon, Steven S. and Barbulescu, Sorin Adrian (2003) Iterative source-channel decoding for robust image transmission. In: 4th Australian Communications Theory Workshop (AusCTW 2003), 05-07 Feb 2003, Melbourne, Victoria.

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Abstract

In this paper we investigate iterative source-channel decoding for robust JPEG coded images transmission over noisy channels. Huffman codes used as the variable-length coding scheme in JPEG coding can be represented by an irregular trellis structure proposed by Balakirsky (1997). State transition probabilities can be derived from the irregular trellis and can be used as a priori information to help iterative decoding between channel and source a posteriori probability (APP) decoders. Iterative decoding of JPEG coded images does not perform well due to the poor distance property of the original JPEG Huffman codes. In this paper, we proposed a symmetric reversible variable length code with free distance df = 2 which can dramatically improve the system performance when iterative decoding is adopted. A maximum coding gain of 4 dB was observed from the simulation results. Subjective results in terms of reconstructed images were also presented


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: No evidence of copyright restrictions.
Depositing User: Ms Leslie Blay
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - No Department
Date Deposited: 06 May 2010 12:53
Last Modified: 02 Jul 2013 23:52
Uncontrolled Keywords: iterative source-channel decoding; reversible variable length code; JPEG coded image
Fields of Research (FOR2008): 09 Engineering > 0906 Electrical and Electronic Engineering > 090609 Signal Processing
08 Information and Computing Sciences > 0804 Data Format > 080401 Coding and Information Theory
08 Information and Computing Sciences > 0801 Artificial Intelligence and Image Processing > 080106 Image Processing
Socio-Economic Objective (SEO2008): B Economic Development > 89 Information and Communication Services > 8902 Computer Software and Services > 890205 Information Processing Services (incl. Data Entry and Capture)
URI: http://eprints.usq.edu.au/id/eprint/7939

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