基于二值图像的抗旋转攻击零水印算法

针对目前多数基于变换域的零水印算法不能抵抗几何攻击（RST变换）的问题，提出一种基于二值图像的抗旋转攻击零水印算法。采用对数极坐标系，将笛卡尔坐标系中的旋转变换转换为循环平移的性质，在水印提取时使用穷举遍历的方法来检测循环平移后的测试图像是否包含水印信息。实验结果表明，该方法可获得较好的图象视觉效果，对加噪、滤波、JPEG压缩和剪切攻击具有较好的鲁棒性。

Zero Watermark Algorithm Against Rotation Attack Based on Binary Image

Considering the existing watermark method based on transformation region without resisting to geometric attack ability,this paper proposes a method based on binary image,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 watermark or not.Experimental results ...