一种新的基于Contourlet变换的数字图像零水印算法

提出了一种基于Contourlet变换的数字图像零水印算法。算法首先对宿主图像进行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,利用该关系同时结合加密后水印图像构造零水印。实验结果表明,该水印算法对JPEG压缩、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。

A new zero watermarking scheme for digital image based on Contourlet transform

In this paper,a digital image zero watermarking scheme in contourlet domain is proposed.Firstly,the original image is decomposed by using Contourlet,the lowpass subband and bandpass subband are getted,then according to the Contourlet coefficients and the watermarking,construct the zero watermarking.Experimental results showed that the digital image watermarking has good 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.