半脆弱印刷数字有意义水印算法研究

Research on Semi-Fragile Printed Meaningful Watermarking

数字水印技术是在数字作品中嵌入不明显的记号。该文分析了印刷品制作中包含数模-模数转换过程的特性,与数字水印技术相结合,将纯数字域的防伪手段应用到模拟领域中的印刷品上。将印刷品扫描打印过程作为失真信道进行建模分析,并在算法中加入预失真;比较了数字水印各算法,结合印刷品的特性采用并改进特征值分解的方法,嵌入和检测有意义水印,通过该水印对二次扫描打印印刷品脆弱不可检测,来达到防伪的要求。该算法相对于空域算法和其他变换域算法有复杂度低、检测准确度高的优势。

Watermarking is the method of embedding invisible message in digital works. In this work, by analyzing digital-analog (DA) and analog-digital (AD) process, a novel method of printed meaningful watermarking is proposed based on singular value decomposition (SVD). The distortion of printing and scanning is analyzed. The experiment result shows that the method is feasible for embedding and detecting watermarking in printing.