一种基于预估计的水印模版跟踪算法

针对水印几何同步问题提出了一种基于预估计的水印模版跟踪方案。通过对图像一阶矩的分析，发现图像的质心能体现图像的几何变换特性，因此可以对水印图像的几何攻击产生一个预估计，进而计算出几何攻击的变换参数。在水印检测中，不是对水印图像进行几何逆变换，而是对水印模版进行几何变换，利用模版的主动匹配，可以得到较好的检测效果。仿真结果表明该方案可以有效地抵抗几何变换攻击，并且在常规的图像处理中具有很好的鲁棒性。

Watermarking template tracing algorithm based on pre-estimation

In this paper, a method is presented based on the template tracing to deal with geometric synchronization in watermarking. By analyzing the first order moment of the image, it was found that the barycenter of the image can completely reflect the geometric transform behavior, moreover, a simple method was presented to pre-estimate the geometric attacks of the watermarked image and calculate parameters of geometric transforms. In the detection side, the watermarked image was not inversely transformed, instead, the watermarking template was transformed and the image was matched initiatively. Simulation results show that the proposed scheme can work well under several kinds of geometric attacks, even combined with the common image processing.