基于灰度图像抗打印扫描的数字水印算法  

Digital watermarking for print and scan process based on gray image

作　　者：张艳珂[1] 廖晓峰[1] 金渊智[2] 周庆[2] 

机构地区：[1]重庆大学计算机学院,400044 [2]重庆大学

出　　处：《微计算机信息》2009年第6期65-66,75,共3页Control & Automation

基　　金：基金申请人:廖晓峰;项目名称:基于混沌密码学的安全JPEG2000图像编码系统的设计和实现;基金颁发部门:国家自然科学基金委(60573047)

摘　　要：针对灰度图像的特点提出了一种基于连续超混沌系统和离散余弦变换(DCT)的盲检测水印算法。该算法能抵抗打印扫描的攻击。首先分析了打印扫描对图像的影响, 针对打印扫描对图像影响的特点, 选取在图像的 DCT 域上嵌入水印信息。对 DCT 变换后的系数进行特殊的排列分组,根据 HVS 原理选取嵌入位置,通过调整每一组中正负号的数量来表达水印信息, 增强了算法的鲁棒性。由于该算法对打印扫描具有较强的鲁棒性, 因此可用于印刷图像的版权保护和认证。Based on continuous hyper-chaotic system and discrete Cosine transform, this paper presented a blind detection watermarking algorithm for gray image to hide information against print-scan process. First, the effect of printing and scanning for images is discussed. According to the characteristic of the effect, the digital watermarking is embedded on the DCT domain of images. Especially, the DCT coefficients are classified, then, according to the principle of HVS, the embedded locations was selected. The digital watermarking is expressed by the count of difference between the positive and the negative in each group, and the robustness is enhanced. Since this algorithm is robust for printing and scanning, it can also be used in copyright and authentication purposes of digital image for the printed format.

关 键 词：数字水印 离散余弦变换 打印扫描 超混沌 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TP309.2[自动化与计算机技术—计算机科学与技术]