基于Contourlet变换的抗旋转攻击零水印算法

Zero digital image watermarking method against rotation attack based on Contourlet transform

为了提高变换域零水印算法抵抗图像旋转攻击的能力,提出了一种基于Contourlet变换的抗旋转攻击零水印算法。对于旋转造成的几何攻击,可以通过对数极坐标系将笛卡尔坐标系中的旋转变换转换为循环平移的性质;对于循环平移后的图像,在水印检测时可以使用穷举遍历的方法来检测测试图像是否包含水印信息。实验结果证明,该方法可以获得良好的图像视觉效果,同时对于加噪、滤波、JPEG压缩、剪切攻击也有很好的鲁棒性。

In order to improve the ability against rotation attack of zero digital image watermarking method,this paper proposed a method based on Contourlet transform against rotation caused by distortion,Log-Polar Mapping(LPM) was used to transform rotation problem in Castesian coordinate to translation property in LPM coordinate.After translation,an exhaustive search was adopted to detect test whether image involves watermarking or not.The experimental results demonstrate that the proposed method can obtain better ...