基于双重加密和Contourlet变换的数字图像盲水印算法

摘要

This paper proposed a blind digital image watermarking scheme by double encryption and Contourlet transform.Firstly, encrypted the watermarking, then decomposed the original image by using Contourlet, required the low-pass sub-band and band-pass sub-band, and created the relations between the Contourlet coefficient and the determinant. According to the relations, embedded the watermark on the Contourlet low frequency coefficients. In addition, no host image was needed in watermark extraction, which was a blind watermarking algorithm. Experimental results show that the digital image watermarking has good imperceptibility and robustness against the attacks of JPEG compression, low-pass filtering, noise addition, scaling and cropping. The dual encryption of the watermark improves the security of the system.%提出了一种新的基于双重加密和Contourlet变换的数字图像盲水印算法.算法首先将水印图像进行双重加密,然后对宿主图像进行Contourlet变换得到低通子带和带通子带,建立Contourlet系数与行列式之间的大小关系,利用该关系将加密后的二值水印嵌入到Contourlet低频系数上.此外,水印提取时不需要宿主图像,可实现水印图像的盲提取.实验结果表明,该水印算法不仅对嵌入的水印具有良好的视觉保真度,而且对JPEG压缩、低通滤波、噪声、缩放、剪切等多种攻击具有很强的鲁棒性.同时,水印图像的双重加密提高了系统的安全性.