基于Radon变换抵御旋转攻击的数字水印检测算法

Detection method of digital watermark about anti-attacking rotation based on Radon

检测算法的提出基于Radon变换固有特性,应用于抵御数字水印旋转攻击。检测算法先对原始图像进行Radon变换并记录变换结果作为参照向量;其次对待检测图像在旋转角度的值域内按一定步长进行多次变换,得到多个检测向量;最后比对参照向量与检测向量之间的相关系数,最大相关系数对应的角度即为检测角度。实验表明检测算法具有较高的精度,可配合通用数字水印算法使用。

This detection method is in use of defending rotation attack based on Radon transform characteristic. Performed Radon transform on original image and recorded outcome, then collected results on pending image in possible value with a certain step, finally a conclusion is obtained after comparing the two parts, the correlative number which is the biggest releases the rotation angle. Research shows that this method has good precision, it can be used as digital watermark detector for future.