A novel digital watermarking technique was proposed for authenticating binary images.The pixels in binary image were divided into two categories,one was the flippable pixels and another was the unflippable pixels. In the watermark generation process, the unflippable pixels were input into a Hash function for generating the authenticating signals which depended on the content of the image, and then the authenticating signals and the image ownership information were encoded with a chaotic sequence to form the watermark. The watermarked image can be obtained by inserting the watermark into the flippable pixels. Experimental results show that the watermark can be blindly extracted, the proposed method can detect any modification to the watermarked image, and verify the ownership while the watermarked image is not manipulated.

提出了一种新的用于二值图像完整性认证的水印算法。将二值图像像素划分为可翻转像素和不可翻转像素两种类型;在水印生成过程中，将不可翻转像素作为Hash函数的输入生成与图像内容有关的认证信息，并利用混沌序列对认证信息和图像所有者信息进行加密生成水印信号;将水印信号替代可翻转像素，完成水印的嵌入。实验结果表明，该算法实现了水印的盲检测，可以精确检测到水印图像的一个像数点的改变，并且在图像未经处理的情况下可以实现图像的所有者认证。

数字水印, 二值图像, 图像认证, 混沌加密