Robust Quality-Scalable Transmission of JPEG2000 Images over Wireless Channels Using LDPC Codes

摘要

A new error-resilient JPEG2000 wireless transmission scheme is proposed. The proposed scheme exploits the 'progressive by quality' structure of the JPEG2000 code-stream and takes into account the effect of channel errors at different quality layers in order to protect the coded bit-stream according to channel conditions using multi-rate low-density parity-check (LDPC) codes, leading to a flexible joint source-channel coding design. The novelty of this adaptive technique lies in its ability to truncate the less important source layers to accommodate optimal channel protection to more important ones to maximize received image quality. Results show that the proposed scheme facilitates considerable gains in terms of subjective and objective quality as well as decoding probability of the retrieved images.