一种基于多小波变换的数字图像水印算法  

Image watermarking algorithm based on discrete multiwavelet transform

作　　者：阳婷婷[1] 李峰[1] 

机构地区：[1]长沙理工大学计算机与通信工程学院,长沙410076

出　　处：《计算机工程与应用》2007年第30期111-115,238,共6页Computer Engineering and Applications

基　　金：湖南省自然科学基金(the Natural Science Foundation of Hunan Province of China under Grant No.05JJ30123);湖南省教育厅科学研究项目(No.05C246)。

摘　　要：提出了一种基于离散多小波变换(DMT)的数字图像水印算法。首先对图像作GHM多小波两层和三层分解来嵌入水印信息,然后根据多小波的特征改进Dugad的阈值选取公式,最后采用一种新的图像质量标准来评价水印图像和原图像的相关性。实验证明在GHM多小波变换域中嵌入水印比在DWT域中嵌入水印具有更好的鲁棒性。A novel image watermarking algorithm which based on Discrete Multiwavelet Transform （DMT） is proposed.Firstly,the watermark information is embedded in the original imagine through three-level and two-level decomposition of image using the GHM muhiwavelet.Secondly the threshold value selection formula is improved according to the characteristics of multiwavelet. Finally a new image quality index is adopted to measure the correlation between the original and the watermarked images.The experimental results show that our new algorithm can give more robustness of the watermark than based on DWT domain.

关 键 词：多小波 图像水印 扩频水印 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]