【作者】 国伟； 刘宇鑫； 宗泽； 亓文法；

【Author】 GUO Wei 1,a , LIU Yuxin 2,b , ZONG Ze 3,c and QI Wenfa 2,d 1 Chinese Academy of Inspection and Quarantine, China 2 Institute of Computer Science and Technology, Peking University, China 3 University of electronic science and technology of China, China

【机构】 中国检验检疫科学研究院； 北京大学计算机科学技术研究所； 电子科技大学通信与信息工程学院；

【摘要】 随着信息技术和数码图像复制设备的飞速发展,信息传播的载体形式出现多样化趋势,但是在很多应用领域,纸介质作为信息载体仍然具有广泛的不可替代性,同时纸介质文档中的信息安全也面临着很大的挑战,因此如何解决纸介质文档载体中的信息安全问题成为众多学者关注的研究课题之一。本文提出了一种基于网点调制底纹的印刷文档图像中的信息隐藏方法,该底纹由大量随机排列的印刷网点构成,其中包括编码点、定位点以及视觉干扰点。通过编码点特定位置的偏移来隐藏信息,而定位点用来探测编码块和相邻编码点偏移前的初始位置,同时干扰点的随机扰动保证了隐藏信息的安全性和视觉隐蔽性。实验结果表明,利用本文所述方法设计出的网点调制底纹隐藏的信息量很大,并且对打印扫描攻击具有较强的鲁棒性。另外,该技术可广泛用于防伪印刷、防复印、文档内容防篡改以及文档图像检索等应用领域。更多还原

【Abstract】 With the rapid development of the information technology and digital image copy devices, the information carrier shows off diversified trends. However paper media still play an important role in many areas serving as information carrier, and correspondingly the information security of paper documents faces great challenges. So how to solve the information security problems of paper media has become the hottest research topic. This paper proposes an information hiding method used in printed documents image based on the screen dots modulating shade composed of a large number of randomly arranged screen dots. These dots are classified into coding dots, anchor dots and perturbing dots respectively. Experimental results show that screen dots modulating shade using our method has larger information capacity and also has strong robustness against the attacks of print-scan processes. Moreover, this technology also can be widely used in many other areas, such as anti-counterfeit printing, anti-copy, document content tamper-proofing and document image retrieval etc.更多还原