一种基于二值印刷图像的数字水印方案

针对商业文档的完整性保护问题，提出了一种数字水印方案．由于方案是基于印刷文本的，所以关键是解决在二值图像上水印嵌入和提取的方法．方案提出了基于文字区域嵌入水印的方法，即将文字分割成若干区域，并以区域中0／1比率作为特征量来决定水印的数值．在大量实验基础上，总结了如何在二值文本图像中非显见地改变图像的原则．在仿真实验中，主要证明方案对于硬件差异的稳健性，结果表明，方案能够达到应用的要求，是一种可用的有潜力的方法．

A Secure Digital Watermarking Scheme for Binary Printing Images

This paper proposed a novel watermarking scheme for the authentication of business documents by embedding a piece of information in the binary document image. Because it is based on printing text, the most important point is to find out an embedding and abstraction method based on the binary images. This paper gave out an embedding method based on the regions otherwise single pixels, in which the printing character is divided into some regions, and the watermark value is decided by the 0/1 ratio in the region. Based on many experiments, this paper also deduced the rules to change the 0/1 ratio without notice. At the end, the robustness of this method against hardware difference is experimented, and the results show that this scheme is useful and potential.