一种基于视觉特性及形态网屏编码的纸介质信息防伪方法

An anti-fake method based on visual characteristics and morphology screen coding

提出一种基于视觉特性及形态网屏编码的纸介质信息防伪方法。其原理是通过控制网屏点阵的数学形态变化,将警告性图案(文字)隐藏在证件的背景底纹中,利用人眼视觉特性和复印机复印特性的差异制作出视觉不可见,但一经复印机复印,即可浮现出隐藏的警告信息。通过设计不同数学形态的网屏点阵编码将证件上的证明信息埋入到背景中,用提取的隐藏信息与证件上的明文信息的比对来验证真伪。通过对多种财务票据、证书的大量实验结果表明,该方法验证正确率达到98%以上。

An paper information anti-fake method based on human visual characteristics and morphology screen code technology was proposed through controlling the distribution of mathematical morphology of screen dot-matrix,warning mark was hid in background texture. Because of the differences between human vision and duplicate characteristic of copy machine, hu man eye can not distinguish the mark from the texture. But warning mark will emerge after copy. Meanwhile plaintext or other certificate information will be embedded into background texture by different mathematical morphology screen dot-matrix code. Embedded information was extracted from scanned image of certificate via recognition program, by comparison with plalntext printed on certifieate,counterfeit or fake certificates can be identificated. The method was applied in many bills and certificates,Experimental results showed that the identification accuracy is above 98 %.