基于奇异值分解和小波变换的抗几何失真数字水印新方法

目前,大多数鲁棒图像水印所面临的最大问题就是几何攻击,而现有水印技术大都难以抵抗几何变换类攻击,如旋转、尺度变换等,由于几何攻击破坏了水印分量的同步,即使微小幅度的图像旋转或尺度变换都可能导致水印检测过程失败.提出了一种基于奇异值分解和小波变换的方法来盲提取受到几何攻击后的图像中的水印,即利用了奇异值对几何失真的稳健性,又利用了小波变换对一般攻击的稳健性.实验证明,提出的方法对几何攻击具有很好的鲁棒性.

A NEW DIGITAL WATERMARKING METHOD AGAINST GEOMETRICAL DISTORTION BASED ON SVD AND DWT

Geometric attacks are the challenging problems that most robust image watermarking systems face today.And it is difficult for most watermarking technology to resist geometrical attacks such as rotation and scaling.Even the slightest rotation or scaling will lead to the failing of watermark detecting because the geometric attacks destroy the synchronization of watermarks.In this paper,a novel method is proposed to blind extract the watermark of attacked image.The method uses both the stability of singular value decomposition(SVD)against geometric distortion and the stability of discrete wavelet transform(DWT)against common distortion.Experiment results prove that the method proposed is characteristic of good rdoustness against geometrical attacks.