基于图像特征的鲁棒性数字水印算法

为了同时实现图像版权保护和图像内容的真伪性鉴定，提出了一种基于数字图像特征的鲁棒性数字水印算法。先利用Hessian变换提取宿主图像的特征区域，并根据每个特征区域内各个像素点的局部方向，将用于版权保护的水印信息嵌入到这些特征区域中。同时，向图像中除特征区域之外的区域嵌入用于图像内容真伪鉴定的脆弱性水印。水印提取过程是水印嵌入的逆过程，在不需要原始图像的情况下实现了版权水印和内容鉴定水印的提取。实验表明，该算法能抵杭大多数的移除攻击等几何篡改，对篡改发生的位置定位效果良好。

Robust Watermarking Algorithm Based on the Feature of Digital Image

In order to achieve the goal of image authentication and protection simultaneously, we proposed a feature based robust digital image watermarking algorithm. I}he Hessian-Affine feature detector was used at first to search characteristic regions of an image, then embed the copyright watermark into these characteristic regions according to the local orientation of each pixel. Moreover, the remainder regions were applied for image authentication by using fragile watermarking method. The proposed watermark extract scheme is similar with the above embedding scheme, the procedure is executed blindly, for the host image is not needed. The experimental results in this paper show that the proposed watermarking algorithm can resist most removal and geometric attacks. Besides, changes of an image will be reflected in our hidden watermarks.