应用科学学报 ›› 2011, Vol. 29 ›› Issue (2): 140-146.doi: 10.3969/j.issn.0255-8297.2011.02.006

• 信号与信息处理 • 上一篇    下一篇

抗打印扫描攻击的大容量文本水印

郭承青1;2, 徐国爱1;2, 钮心忻1;2, 李洋1;2   

  1. 1. 北京邮电大学网络与交换技术国家重点实验室信息安全中心,北京100876
    2. 北京邮电大学网络与信息攻防技术教育部重点实验室,北京100876
  • 收稿日期:2010-10-18 修回日期:2010-12-03 出版日期:2011-03-23 发布日期:2011-03-23
  • 作者简介:郭承青,博士生,研究方向:信号与信息处理、数字水印,E-mail:chqguo@bupt.edu.cn;钮心忻,教授,博导,研究方向:信号与信息处理、信息隐藏、数字水印等,E-mail: xxniu@bupt.edu.cn
  • 基金资助:

    国家“973”重点基础研究发展计划基金(No. 2007CB311203);国家“863”高技术研究发展基金(No.2009AA01Z439);国家自然科学基金(No.U0835001);博士后基金(No. 20100471762)资助

High-Capacity Text Watermarking Resistive to Print-Scan Process

GUO Cheng-qing1;2, XU Guo-ai1;2, NIU Xin-xin1;2, LI Yang1;2   

  1. 1. Information Security Center, State Key Laboratory of Networking and Switching Technology,Beijing University of Posts and Telecommunications, Beijing 100876, China
    2. Key Laboratory of Networking and Information Attack and Defense Technology of MOE,Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2010-10-18 Revised:2010-12-03 Online:2011-03-23 Published:2011-03-23

摘要:

DOI: 摘要: 在分析现有文本水印算法的基础上,提出一种大容量且抗打印扫描攻击的文本水印算法. 该算法首先对文本图像进行字符切分,以字符复杂度为标准选择嵌入字符和调整字符,然后以打印扫描不变量为基础,通过建立量化函数翻转单个字符像素以嵌入多位水印信息. 该方法能降低整体的字符翻转量,减小文本图像的失真程度. 实验表明,文中方法可有效提升水印嵌入容量,并能抵抗打印扫描攻击,达到在纸质文本中嵌入水印的目的.

关键词: 打印扫描, 大容量, 数字水印, 文本图像

Abstract:

 Based on an analysis of the existing text watermarking techniques, a high-capacity text watermarking scheme resistive to print-and-scan processes is proposed. The binary document image is first segmented into individual characters. A multi-bit watermark is then embedded by flipping the boundary pixels of each character based on a print-scan invariant quantity and complexity of the character. A quantitative model is established to achieve the character pixel quantization, which can minimize visual distortion. Experimental results show that the proposed scheme can increase embedding capacity. It can effectively resist print-scan attacks so as to watermark hardcopy documents.

Key words: digital watermarking, document image, print-scan, high-capacity

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