实现压缩图像不等错误保护的两类新方案  

Two novel unequal error protection schemes applied to image transmission

作　　者：韩昌彩[1] 袁东风[1] 罗骥[1] 

机构地区：[1]山东大学信息科学与工程学院,山东济南250100

出　　处：《山东大学学报（理学版）》2005年第3期66-70,75,共6页Journal of Shandong University(Natural Science)

基　　金：国家自然科学基金资助项目(60372030);国家留学回国基金项目(教外司留[2003]406);山东省自然科学基金重点项目(Z2003G02)

摘　　要：根据嵌入式零树小波(embeddedzerotreewavelets,EZW)编码后输出码流的特点,将Turbo码应用于EZW压缩的图像传输系统中,提出了新的基于信源编码的信道编码的优化算法以及发射功率的分配方案,实现图像传输的不等错误保护(unequalerrorprotection,UEP).仿真结果表明,与等错误保护(equalerrorprotection,EEP)方案相比,所提出的UEP方案具有更高的功率有效性.此外,给出另一类新的功率控制方案,在保证重建图象质量的前提下,发射功率和时延可以大大降低.Turbo codes are applied to embedded zerotree wavelets (EZW) coded image transmission system. According to the characteristics of the EZW coded bit stream, two novel kinds of unequal error protection (UEP) schemes are proposed by optimizing channel code or power allocation. Simulation results reveal that both of the proposed UEP schemes have higher power efficiency than equal error protection (EEP) schemes. Moreover, a new method of power control is presented, in which the transmission power and time delay can be greatly reduced while the quality of the reconstructed image is guaranteed.

关 键 词：图像传输 TURBO码 嵌入式零树小波 不等错误保护 

分 类 号：TN911[电子电信—通信与信息系统]