一类小波域图像乘性水印信道容量的计算

Computation Methods of Image Watermarking Channel Capacity in Wavelet Domain

信道容量是衡量通信系统性能的一个关键性指标,它给出了通信系统传输信息的理论极限,当视数字水印系统为一个通信系统时,数字水印信道容量的研究具有同样重要的意义。但数字水印信道容量的计算是一个十分困难的课题。通过建立小波域图像的统计先验模型和应用信息论中信道容量的迭代计算方法,给出了一类小波域图像乘性水印信道容量的数值计算方法和实验结果。

Channel capacity is the key index of measuring the property of communication system,which giving the theoretical limit of transmission message.lt is the same important for digital watermarking system which is viewed as a communication system.But the computation of the channel capacity of digital watermarking is very difficult.By statistical prior model of image wavelet coefficient and iteration methods of channel capacity in the information theory,this paper derives a kind of computation method of multiply watermarking channel capacity in the wavelet domain.