基于混沌和数字签名的图像数字水印

该文提出了一种基于混沌映射和数字签名的数字水印系统。用混沌映射对原始图像进行处理 ,生成一张与原始水印大小一样的图像块 ,计算图像块的每一子块的均值 ,把图像块转换成一个二值图像 ,然后将该二值图像与原始二值水印作运算得到一个新的私有水印 ,水印的还原过程与以上过程相反。结合数字签名技术把原始图像所有者有关信息通过认证中心进行认证签名 ,从而能够保证了水印的安全性。实验结果表明 ,本方法对一般图像处理具有一定程度的鲁棒性

A Watermarking System Based on Digital Signature and Chaos Map

In this paper a watermarking system based on digital signature and chaos map is proposed. Firstly, an original image is processed by chaos map thus generating an image block with the size of watermark. Then calculating the average pixel of each subblock of image block, so to generate a black and white image with the size of watermark. Secondly, this black and white image performs xor on each pixel of watermark , then generates a new black and white image, this image is a security image . Restore watermark is invert to the above-mentioned method. The chaos map and digital Signature technology are introduced to improve the watermarking security. Experimental results show the proposed technique has high robustness in image processing operations.