一种基于正交小波变换的盲水印算法

提出了一种新颖的以灰度图像为水印的数字水印算法.首先利用正交小波变换对原始图像进行分解,然后借鉴传统的叠加思想,根据小波变换后,高低频分量的特点,将图像水印嵌入到小波域的低频部分.由于整个嵌入过程中,对原始图像没有进行任何改变,因此绝对保证了原图像的质量.水印的嵌入和提取都在密钥控制之下,可以较好地解决版权争议等问题.实验结果证明该算法对常见的图像处理操作和几何攻击有很强的鲁棒性.

A New Blind Digital Watermarking Algorithm Based on Orthogonal Wavelet Transform

On the basis of orthogonal wavelet transform,a new blind watermarking algorithm using a gray image as watermark is proposed.This algorithm takes advantages of the wavelet transform and adds watermark onto the wavelet coefficients located in the low frequency sub-band.The watermark is embedded without modifying the coefficients,so this method is invisible and experimental results show that it also has strong robustness against many image processing attacks such as JPEG compression,median filter additive noise,cropping and geometric distortions.So it is effective and practical.