红外与毫米波学报, 2002, 21 (1): 44, 网络出版: 2006-05-10
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
变系数定长(VCFL)编码 子波变换 码率兼容删除卷积码(RCPC) 不同程度差错保护(UEP). variable-coefficient fixed-length (VCFL) coding wavelet transform rate-compatible punctured convolutional (RCPC) c unequal error protection (UEP)
摘要
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,Rate Compatible Punctured Convolutional code)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,表现出良好的抗误码能力.
Abstract
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).
顾炜, 胡波, 凌燮亭. 一种综合源编码和信道编码的图像编码方案[J]. 红外与毫米波学报, 2002, 21(1): 44. 顾炜, 胡波, 凌燮亭. A SCHEME OF SOURCE-CHANNEL IMAGE CODING[J]. Journal of Infrared and Millimeter Waves, 2002, 21(1): 44.