半色调图像中数据隐藏算法  

Data Hiding Algorithm for Halftone Images

作　　者：牛少彰[1] 钮心忻[1] 杨义先[1] 胡文庆[1] 

机构地区：[1]北京邮电大学信息安全中心,北京100876

出　　处：《电子学报》2004年第7期1180-1183,共4页Acta Electronica Sinica

基　　金：国家自然科学基金 (No .60 0 730 4 9) ;国家重点基础研究发展规划项目 (No .TG1 9990 3580 4 ) ;北京市自然科学基金项目 (No.40 4 2 0 2 2 ) .

摘　　要：在许多打印和出版应用中 ,需要在半色调图像中嵌入数据用于作品的版权保护和认证 .本文提出了一种半色调图像中数据隐藏的算法 ,该算法利用DCT的中频系数比较法进行数字水印信息的嵌入 .在对数字水印信息进行嵌入前 ,首先进行编码 ,转化成比特流 ,然后通过改变DCT中频系数的序关系嵌入数字水印 ,经打印 /扫描后提取出水印 ,实验结果显示 :该算法能够抵抗打印—扫描攻击 ,并且隐藏效果好 ,恢复水印时不需要原始图像 .In many printer and publishing applications, it is desirable to embed data in halftone images for copyright and authentication purposes. In this paper, a novel data hiding algorithm for halftone images is proposed. The digital watermarking is embedded by DCT mid-frequency coefficients comparison method, Before embedding, the digital watermarking is transformed into binary data, and then they are embedded into DCT mid-frequency subbands by changing the order of these coefficients. Experiments show that this algorithm is robust for printing and scanning, and the original picture is not needed in the recover progress of the digital watermarking. This algorithm can also be used for forgery detection in certificates.

关 键 词：打印/扫描 数字水印 半色调图像 

分 类 号：TP309.9[自动化与计算机技术—计算机系统结构]