图像数字水印容量分析

图像水印容量分析是研究在图像中究竟可以隐藏多少信息的问题,研究如何在满足水印不可感知性和鲁棒的前提下传递尽可能多的水印信息。为了研究水印容量,一般把水印的嵌入和提取视为一次通信过程。该文认为应在满足水印不可感知性的前提下,基于图像的内容自适应地限制水印的嵌入功率。该文分析了现有水印容量分析方的不足,提出了一种内容自适应的水印嵌入算法,在此基础上,提出了一种利用噪声可见性函数对水印嵌入功率进行适应限定的水印容量分析方法,并讨论了盲检测和非盲检测情况下的水印容量问题。

Image Digital Watermarking Capacity Analysis

Image watermarking capacity is an evaluation of how much information can be hidden with in a digital im-age,Research of watermarking capacity is to study how to transmit more watermark information while keeping the invis-ibility and robustness of watermark at the same time.In watermarking schemes,image is considered as a communication channel to transmit messages.We think that watermark power should be constrained according to the content of image.In this paper,we analyze shortages of some previous watermarking capacity methods and presents a watermarking capacity method using the noise visibility function,and discusse the watermarking capacity of blind watermarking and non-blind watermarking.