用于二值图像认证的数字水印技术

为实现对二值图像的认证保护，提出了一种基于数字水印的用于图像完整性和所有者认证的算法. 首先利用像素扩展差（PSD）判断准则将图像块中的像素分为“可翻转”和“不可翻转”；然后利用混沌映射对图像块进行置乱；最后根据加密后的所有者水印信息，对图像块中4部分的“可翻转”像素进行修改，完成水印的嵌入. 实验结果表明，本算法具有良好的视觉透明性，能对图像的内容篡改进行定位，并解决了二值图像中均匀区域的保护这一难点问题.

An Authentication Watermarking Technique for Binary Images

In order to authenticate the binary images,a fragile watermarking technique for image authentication and ownership verification is proposed. The pixels are firstly divided into two groups according to pixel spread difference ( PSD) ,one is the flippablepixels and the other is the unflippablepixels. Then,the image block is permutated by a chaotic sequence. According to the encrypted ownership watermarks,the flippablepixels in the four parts of the image block are altered to get the watermarked image block. E...