一种综合源编码和信道编码的图像编码方案

A SCHEME OF SOURCE-CHANNEL IMAGE CODING

提出了一种新的综合源编码和信道编码的图像编码传输方案 ,对子波变换后各个子带采用基于统计特性的变系数定长 (VCFL)编码后选择不同码率的RCPC(码率兼容的删除卷积码 ,RateCompatiblePuncturedConvolutionalcode)信道编码以提供不同程度的差错保护 (UEP)并进行传输 .在给定传输的总比特数的情况下 ,通过一种优化算法使方案的总体失真最小 .模拟结果表明新方案压缩比高 ,在较高的传输误码率情况下 。

A new wavelet-based joint source-channel image coding scheme was proposed. For each subband, the statistical variable-coefficient fixed-length (VCFL) coding algorithm was applied, then different rate-compatible punctured convolutional (RCPC) code was used before transmission to provide unequal error protection (UEP). Given the total transmission bits, an optimal algorithm was used to minimize the total distortion. Simulation results show that the proposed scheme has higher compression ratio and performs well on channels with high bit error rate(BER).