一种基于零树小波的盲图像水印算法

提出了一种基于零树小波的盲图像水印算法．作专版权标志的水印信息是一幅二值图像，它用一个随机矩阵将水印图像置乱预处理，嵌入的水印数据根据宿主图像的特点自适应地扩频得列，水印嵌入到宿主图像的小波零树上，每一棵小波零树的水印信息对应于水印图像的一个像素点．水印置乱矩阵和扩频水印矩阵是文中的两个密钥，前者保证了图像水印的安全性，后者确保了图像水印的鲁棒性．在没有原始图像的前提下，实验验证了该水印算法在多种攻击下都具有可靠性．

A blind image watermarking based on zerotree wavelet

A blind image watermarking procedure based on the zerotree wavelet is presented. A two-value image as a symbol of copyright protection is used, which is first preprocessed with a random location matrix. The embedding watermark data are obtained adaptively by the host image, and embedded into the zerotree wavelet of the host image. Two keys are used in the watermarking procedure: random location matrix and spread spectrum watermark matrix. The first one ensures the security of watermarking procedure and the second one guarantees its robustness. Under the condition of no original host image, the experimental result demonstrates the robustness of our blind watermarking procedure against serveral image degradations and watermarking attacks.