一种基于图像内容特征的数字水印方法

提出了一种基于图像内容特征的数字水印新方法．水印直接采用灰度图像，嵌入时充分考虑图像的内容特征和人眼视觉掩蔽（HVS）特性，在低中频分量嵌入水印．先提取图像的边缘信息，进行系数修正；又根据小波变换后的系数特性，有选择地调整嵌入的强度，使鲁棒性和不可见性都得到提高．最后用实验和攻击测试验证了该算法的有效性．

A Watermarking Algorithm Based on Image Content Features

A new watermarking method of image content features is proposed in this paper.The still color image is adopted in watermarking.According to the image content features and the characteristics of human visual systems(HVS),the watermark is embedded into the low and the intermediate frequency part.First,the image edge information is abstracted and the coefficient is modified.Then the intension of embedded image is adjusted according to the coefficient features of wavelet transforms.The robustness and the invisibility can be improved.In the end the validity of the method is proved based on the results of experiments and attack test.