一种空频域结合的自适应二值图像水印算法

本文提出了一种向二值图像中嵌入水印的算法。首先对原始二值图像做小波变换，通过分析其小波系数来寻找图像纹理及细节较丰富的区域，作为水印嵌入域。然后在空域中通过改变嵌入点的像素值来嵌入水印。根据图像的纹理丰富程度来自适应地选取嵌入水印的长度。实验结果表明，该算法具有较强的不可见性和鲁棒性，是一种有效的二值图像的水印嵌入算法。

An adaptive binary image digital watermarking algorithm in spatial and frequency domain

In this paper, we propose an algorithm of inserting watermarking to binary image. At first, we transform the original image with wavelet function, then select the zones with rich veins to put in watermarking by analyzing the wavelet coefficients. The watermarking is inserted by changing the pixel in spatial. The length of the watermarking is adaptive to the richness of the image veins. Experimental results show that the algorithm is invisible and robust, and it is an effective watermarking inserting algorithm to binary image.