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Rate Distortion Performance for Joint Source Channel Coding of JPEG image Over AWGN Channel

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Author(s): Jigisha N. Patel, Suprava Patnaik, Vaibhavi P. Lineswala

Journal: International Journal of Image Processing
ISSN 1985-2304

Volume: 4;
Issue: 6;
Start page: 610;
Date: 2011;
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Keywords: JPEG | Convolution Code | Puncturing | JSCC | UEP | EEP

ABSTRACT
This paper presents the rate distortion behavior of Joint Source Channel Coding(JSCC) scheme for still image transmission. The focus is on DCT based sourcecoding JPEG, Rate Compatible Punctured Convolution Codes (RCPC) fortransmission over Additive White Gaussian Noise (AWGN) channel under theconstraint of fixed transmission bandwidth. Information transmission has atradeoff between compression ratio and received quality of image. Thecompressed stream is more susceptible to channel errors, thus error controlcoding techniques are used along with images to minimize the effect of channelerrors. But there is a clear tradeoff between channel coding redundancies versussource quality with constant channel bit rate. This paper proposes JSCC schemebased on Unequal Error Protection (UEP) for robust image transmission. Withthe conventional error control coding schemes that uses Equal Error Protection(EEP), all the information bits are equally protected. The use of the UEPschemes provides a varying amount of error protection according to theimportance of the data. The received image quality can be improved using UEPcompared to Equal Error Protection (EEP).
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