基于网点形状的半色调全息防伪算法研究  

Halftone Holographic Anti-counterfeiting Algorithm Based on Dot Shape

作　　者：郝发义[1] 邓开发[1] 

机构地区：[1]上海理工大学,上海200093

出　　处：《包装工程》2014年第9期122-126,131,共6页Packaging Engineering

基　　金：新闻出版总署数字印刷工程研究中心数字传播重点实验室基金项目(10-00-309-000)

摘　　要：目的研究印刷条件下基于网点形状的半色调全息防伪算法,该算法能够无失真地提取嵌入的防伪信息。方法首先对二值图像信息进行全息加密,然后对拼接的全息数据进行二值化,再把全息二值数据作为选择网点形状的判断条件,把数字图像生成半色调图像。提取防伪信息时利用全息数据的全局特性,只需任意裁切大于32×32网点大小半色调图像块,就能解密出网点携带的防伪信息。结果提取的防伪信息与嵌入的防伪信息的相似度能够达到100%;半色调图像经过鲁棒性攻击,相似度能够达到90%以上。结论该算法能够无损失地提取防伪信息,有一定的鲁棒性及安全性。Objective To extract the embedded information without distortion based on the theoretical analysis of AM screening technology and holographic theory, the halftone dot shape holographic anti-counterfeiting algorithm was proposed. Methods The binary image information was encrypted, then the holographic data was binarized by splicing, and halftone image was generated from the digital image. The global properties of holographic data were used for decryption. As long as the cropping size of holographic data was larger than 32-32, the carried information of dot shape could be extracted. Results Simulation result showed that the values of NC could reach up to 100%, and after robustness attack, the NC values of the halftone image could still reach more than 90%. Conclusion The algorithm could extract the hidden information well, which has certain robustness and high level of security.

关 键 词：调幅加网 全息 网点形状 防伪 

分 类 号：TS865[轻工技术与工程]