Facsimile Image Compression using Slepian-Wolf Coding Principles and Context Modelling
Keywords:
Facsimile, LDPC, Context-Modelling, Nonuniform Source, Slepian-Wolf Coding, DSCAbstract
In this paper, Slepian-Wolf coding is considered
for compression of facsimile images. The correlation between the image scan lines is exploited at the decoder using Slepian-Wolf coding (SWC). The side information is generated at the decoder using previously decoded image lines and context
modelling. A novel weighted context-based iterative decoding of low density parity check (LDPC) codes is proposed in addition to realizing context-based initialization of log-likelihood ratio values in LDPC iterative decoding. On an average, an increase
of 0.60 in the compression ratio is obtained with the context modelling. As the proposed method is based on SWC principles, it is inherently error resilient and affords a system with a low-complexity encoder
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