利用图像纹理和边缘特征的数字水印方法

提出了一种基于图像纹理、边缘和特征向量的图像数字水印算法。该算法首先把图像进行三级小波分解，再提出三级分解后低频部分的纹理特征和边缘特征，求出边缘特征矩阵的特征向量，用特征向量的值替换三级中频的值，替换的数量由纹理特征矩阵的元素数确定，可采用算法来决定嵌入的具体位置，最后进行三级小波逆变换得到含有水印的图像。做了大量的仿真实验，实验结果表明该算法具有较好的有效性和可行性。

Watermarking method using texture and edge character of image

An image watermarking method based on image texture,edge and eigenvector is proposed in this paper.When em- bedding watermarking,the original image is decomposed by 3-level discrete wavelet first,and then the edge and texture char- acteristic of the third approximation coefficient is extracted.The eigenvector of edge matrix is gotten and third detail coeffi- cient is replaced by this eigenvector.The account of replace is decided by elements of texture matrix.The location of embed- ding is decided by special algorithm.In the end,the approximation coefficient,changed detail coefficients are constructed to obtain image having watermarking.A lot of experiment is done, and results show the efficiency and feasibility of this method.