抗旋转攻击的小波域零水印算法

DWT Domain Zero Digital Image Watermarking Algorithm Against Rotation Attack

为提高基于小波变换的零水印算法抵抗图像旋转攻击的能力,提出一种抗旋转攻击的小波域零水印算法。对于旋转造成的几何攻击,可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,在水印检测时可使用穷举遍历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。

In order to improve the zero digital image watermarking method against rotation attack ability, this paper proposes one method based on DWT, which can against rotation attack ability efficiently. For rotation causing distortion, it makes use of Log-Polar Maping（LPM）, which can transform rotation problem in Castesian coordinate to translation property in LPM coordinate. After translation, it uses an exhaustive search to detect test image involves watermarking or not. Experimental results demonstrate the method can obtain better visual effect.