小波变换域均值调制的可读图像盲水印算法

提出了一种小波变换域均值调制的可读图像盲水印算法,利用图像经离散小波变换后细各细节子带系数均值近似为零的特点,根据细节子带系数的局部方差,自适应地修改图像小波分解后某些细节分量的局部均值,在满足水印不可感知性的条件下自适应地嵌入水印信息,实现水印不可感知性和鲁棒性之间的折衷。同时,在不借助原图像的前提下,实现水印的盲检测。水印信息是一幅有实际意义的二值图像。实验结果和攻击测试表明,提出的算法对常见的滤波、JPEG压缩、添加噪声、剪切等多种攻击有较强的鲁棒性。

Blind Readable Image Watermark Algorithm Based on Wavelet Domain's Mean Adjusting

This paper proposes a blind readable image watermark algorithm based on the mean modulation in the wavelet transformation domain.Because of the means of the detail subband coefficients of the image after discrete wavelet transform is almost nearly to zero,we can adaptively modify the local means of the detail subbands according to it's local variance,and embed invisible watermark adaptively,which satisfies the compromise between the unperceivable and robustness.Further more,it is a blind watermark algorithm to confirm the copyright without the original image,and the watermark is a meaningful binary image.The experimental results and attack test indicate that this algorithm is robust to the common image processing such as filter,JPEG compression,noise pollution,image clip and so on.