基于小波树的数字图像水印技术

基于限定的重要小波树提出了一个数字图像水印的算法，该算法针对水印置乱、嵌入子带的选取、子带阈值的计算、限定的重要小波树的构造、水印的嵌入和提取都给出了相应的策略．实验证明算法对常用的图像处理攻击如JPEG压缩、低通滤波、剪切、加噪等攻击具有较好的鲁棒性、不可见性和安全性．

A digital image watermarking based on the wavelet tree

In this paper, a digital watermark algorithm based on the qualified significant wavelet tree (QSWT) is proposed. This algorithm presents corresponding strategy to shuffle the watermark, select embedded subband for watermarking, calculate the subband threshold, construct the QSWT, embed and extract the watermark. The experiment results show that the algorithm provides high robustness, imperceptibility and security against the original image process attacks such as JEPG compression, lowpass filter, cropping and noise etc.