一种基于重要系数小波树的数字水印算法  

Digital Watermark Algorithm Based on Significant Wavelet Tree

作　　者：于帅珍[1] 

机构地区：[1]安徽财经大学信息工程学院,安徽蚌埠233041

出　　处：《计算机技术与发展》2008年第11期152-155,共4页Computer Technology and Development

基　　金：2008年度安徽省自然科学研究项目(KJ2008B090)

摘　　要：现有的基于小波变换的算法大多将水印嵌入在各个方向的中频或高频中,水印的稳定性差。文中提出一种基于重要系数小波树的数字水印算法,利用小波零树思想和人眼视觉的掩蔽特性,在彩色图像的蓝色分量小波域中构造重要系数树,然后将加密后的水印信息一部分嵌入到低频重要系数中,一部分嵌入到中频重要系数中。实验结果表明:该算法不仅具有较好的不可见性,并且对常见的图像处理操作具有较强的鲁棒性。Most of the DWT methods embed watermark in all directions in the middle or high frequency, the robust has poor stability. In this paper, a new watermark algorithm for color images based on significant wavelet tree is proposed. Using the idea of wavelet zero- tree and masking peculiarity of human visual system, significant wavelet trees are constructed in blue components of color image of wavelet domain, then part of scrambled watermark are embedded into significant lowest frequency coefficients and the other are embedded into the significant middle frequency coefficients. Experimental results show that the proposed algorithm not only has good invisibility, but have strong robust to common image manipulations.

关 键 词：重要系数树 小波零树 离散小波变换 彩色图像 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]