一种能进行篡改定位的文档认证水印算法

Document Authentication Watermarking Algorithm for Tampered Localization

针对一些重要二值文档图像的完整性保护问题,提出一种能进行篡改定位的文档认证水印算法。给出可翻转像素选择标准,利用判断标准确定可嵌入块,然后将加密后水印信息代替可翻转像素实现水印嵌入。实验结果表明,本算法具有良好的不可见性,水印提取既不需要原始图像,也不需要原始水印,并能对图像的内容篡改进行定位。

In order to protect the binary document images＇ integrity, a document watermarking algorithm/or image authentica- tion, integrity verification and tampered localization is proposed. The selection criteria of the flippable plxels are presented and the embeddable blocks are determined by the criteria. The watermarked image can be obtained by inserting the watermarking into the flippable pixels. The watermarking is performed by extracting the central plxel in the embeddable blocks. Experiments show that the watermarked document image has good quality and the embedded watermarking can be extracted without the original docu- ment image and the original watermarking. The tampered content can-be detected and localized successfully.