摘要
为了能更好地利用有限地深空通信下行信道资源,更准确地分析图像有损压缩的失真大小,提出了一种适合于CCS-DS基于小波变换图像压缩标准的速率-失真模型。该模型基于Mallat关于变换编码中速率与失真的分析,通过测试不同图像算法的速率与失真关系,得到模型中需要的各种参数。仿真结果表明,该模型能很好地与图像压缩标准的速率-失真近似。
A rate-distortion model is presented in order to make use of the down channel of deep space effectively and analyzed the error of image loss compression exactly.It is fit for CCSDS image compression standards based on wavelet transform.According to mallat rate-distortion expression about transform coding algorithms,several coefficients of the model are obtained by the simulation of testing a lot of images.Simulation results show that the model is a precise approximation to the rate-distortion of image compression standards.
出处
《科学技术与工程》
2007年第21期5570-5574,共5页
Science Technology and Engineering
基金
新世纪优秀人才支持计划(NCET-04-0332)基金项目资助
关键词
深空通信
图像压缩
小波变换
速率-失真模型
ROI deep space communication image compression discrete wavelet transformation R-D model
