Abstract: 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 multiwavelet.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.

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。