基于小波多尺度图像配准的水印算法研究

The Research for Digital Watermarking Algorithm Based on Wavelet Muitiscaie Image Registration

为提高水印图像对几何仿射变换的鲁棒性,提出基于小波多尺度图像配准算法,并采用Hausdorff距离作为性能函数,有效地减少了搜索复杂度,解决了由于嵌入水印使图像特征位置偏移,导致提取的边缘特征点不能一一对应的问题。实验证明该方法可以极大地提高检测器性能。

In order to improving image watermarking's robustness for affine transform, proposing the image registration algorithm based on wavelet mulltiscale. The comparability of decomposed wavelet components of the image are used to step up the precision and reduce complexity of the calculation. The algorithm use Hausdorff distance as performance function can resolve the problem of tiny position offset of the image characteristics that caused by the watermarking embedding. Experiment results show this algorithm can improve performance of watermarking performance greatly.