收稿日期: 2010-10-18
修回日期: 2010-12-03
网络出版日期: 2011-03-23
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
Received date: 2010-10-18
Revised date: 2010-12-03
Online published: 2011-03-23
郭承青1;2, 徐国爱1;2, 钮心忻1;2, 李洋1;2 . 抗打印扫描攻击的大容量文本水印[J]. 应用科学学报, 2011 , 29(2) : 140 -146 . DOI: 10.3969/j.issn.0255-8297.2011.02.006
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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