基于均值模运算的多小波域水印技术

Watermarking in Multiwavelet Domain Using Mean-modular Scheme

论文提出一种以二值图案为水印的公开水印技术。首先将图像作多小波变换,与标量小波变换不同的是,在同一尺度的同一方向上存在四个子图,且粗尺度子图上的四个子图的平均值非常稳定。基于这个特征,再用均值模运算方法将水印隐藏在多小波域的粗尺度子图中。实验结果表明,文中方法具有很好的不可感知性和稳健性。

This paper proposes a public watermarking with a bi nary watermark.The authors firstly decompose an image by multiwavelet transform .Unlike the scalar wavelet case,there are four subblocks in the same directi on and in the same resolution,and the mean of four subblocks in the coarse le vel is very stable.According to this unique character,the authors then embed a watermark into the coarse subblocks of the multiwavlet domain using mean modula r scheme.Experimental results show that the proposed technique has good imperce ptibility and high robustness to common image processing operation.