一种基于可视密码的轮廓小波图像零水印方案

为了实现数字图像的版权保护,提出了一种基于可视密码的零水印方案.该方案首先实现了一种轮廓小波变换(CWT)的多尺度几何分析方法,然后通过在变换域能量最高的中频子带适当选取系数,结合预定义的可视密码码书,将二值水印图像藏匿于两个分享中,从而构造出零水印信号.实验结果表明,该方案不仅能在不改变原始图像的情况下实现版权保护,而且鲁棒性强,能抵抗JPEG压缩、剪切、加噪、锐化及旋转等图像处理攻击.

An image zero-watermarking scheme based on visual cryptography utilizing contour-wavelet

To achieve the copyright protection of digital image,a zero-watermarking scheme based on visual cryptography(VC) is proposed.Firstly,a novel multiscale geometric analysis(MGA): contour-wavelet transform(CWT) is implemented;then in the transform domain,the coefficients are selected properly from the mid-subband which has the largest energy;finally,the zero-watermark signal is constructed by concealing the binary watermark into two shares according to the selected coefficients and a predefined VC codebook.The...