基于多映射块的二值文本图像认证水印算法  

A Binary Text-image Authentication Watermarking Scheme Based on Multi-block Mapping

作　　者：王大为[1] 吕爱龙[1] 张清泉[1] 秦瑶[2] 

机构地区：[1]山西师范大学物理与信息工程学院,山西临汾041004 [2]大秦铁路股份有限公司太原职工培训基地,山西太原030000

出　　处：《山西师范大学学报（自然科学版）》2015年第2期63-68,共6页Journal of Shanxi Normal University(Natural Science Edition)

基　　金：山西师范大学建设"通信原理"课程组基金项目(SD2014KCZ-07)

摘　　要：针对二值文本图像存在较多均匀区域的情况,本文提出了一种基于多映射块的认证算法.该算法将每个图像块中的不可翻转像素点Hash加密生成水印信息,并将其替代三个映射块中的可翻转像素点完成水印嵌入.篡改检测时设计了结合映射块邻域篡改特征的检测方法来认证图像内容的真实性.实验结果表明,该算法不仅可以有效保护二值文本图像的均匀区域,而且能够准确定位图像的内容替换和拼贴攻击.In the face of many homogeneous regions in the binary text-image,a watermarking scheme based on multi-block mapping is designed in this paper. In the proposed algorithm,the watermark information of each block is generated by hashing its unflipplabe pixels,and embedded in the flippable pixels of three mapping blocks. A tamper detection method combined with the neighborhood tampering feature is designed to verify the authenticity of image content. Experimental results demonstrate the proposed scheme can not only effectively protect the homogeneous region in the binary text-image,but also successful localize the image content replacements and collage attack.

关 键 词：二值图像 多块映射 认证水印 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]