Abstract: A novel blind watermark algorithm based on the feature of digital image is proposed. According to multi-resolution property of Wavelet transform, special trees are extracted from the Wavelet coefficients by fix the root nod in low frequency sub-band. Watermarks are embedded in the nods of extracted trees in intermediate frequency sub-band by establishing relationship between coefficients and its neighbors. To enhance the security, secret keys that make the embedding positions change randomly are used. The embedded watermark has good transparency and robustness and practicality is perfect.

Key words: Digital watermark, Wavelet transform, Wavelet tree

摘要： 提出一种基于特征的新型数字图像盲水印算法。根据小波变换的多分辨特性，通过在低频子带确定根节点的方法从小波系数中提取小波树。利用在小波树的中频节点与其邻域内的系数之间建立关系的方法嵌入水印。，通过密钥控制使水印的嵌入位置随机变化以提高安全性。嵌入的水印具有很好的透明性和鲁棒性，实用性较高。

关键词: 小波变换, 小波树, 数字水印