一种基于图像平滑性的脆弱性文档水印算法  

Fragile document watermarking algorithm based on image smoothness

作　　者：郗艳华[1,2] 张敏瑞[2] 

机构地区：[1]咸阳师范学院物理与电子工程学院,陕西咸阳712000 [2]西安科技大学通信与信息工程学院,陕西西安710054

出　　处：《西北师范大学学报（自然科学版）》2011年第4期48-51,55,共5页Journal of Northwest Normal University(Natural Science)

基　　金：陕西省自然科学基金资助项目(2007F04);陕西省教育厅专项基金资助项目(09JK808);咸阳师范学院专项科研基金资助项目(07XSYK286)

摘　　要：针对政府文件、银行支票、合同和证书等数字文档的完整性检测和真实性认证问题,提出了一种基于平滑性的文档水印算法.利用像素翻转前后其邻域内水平方向和竖直方向的平滑性不变来判断可嵌入块,然后将水印信息嵌入;检测时通过提取可嵌入块的中心像素得到水印信息.实验结果表明,水印的不可见性好,简单有效.该算法水印提取既不需要原始图像,也不需要原始水印,能对含水印文档图像的篡改进行检测并准确定位.A fragile document watermarking algorithm based on image smoothness for authentication,integrity verification and tampering detection of government documents,bank checks,contracts and certificates is presented.Flip ability of the central pix is determined by the smoothness along the horizontal and vertical direction in 3×3 neighborhood,the watermarking is embeded in the image block.The watermarking is performed by extracting the central pix in the embeddable blocks.Experiments show that the watermarked document image has a good quality and the embedded watermarking can be extracted without the original document image and the original watermarking.The proposed algorithm is simple and applicable.The tampered content can be detected and localized successfully.

关 键 词：文档水印 平滑性 脆弱性 完整性 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]