基于小波树的数字图像盲水印技术  

Wavelet Tree Based Blind Watermark Technique for Digital Image

作　　者：张永平[1] 苏广川[1] 

机构地区：[1]北京理工大学电子工程系,北京100081

出　　处：《计算机工程与应用》2006年第13期22-25,共4页Computer Engineering and Applications

基　　金：国家自然科学基金资助项目(编号:60472021)

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。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 fixing 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,practicality is perfect.

关 键 词：数字水印 小波变换 小波树 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构]