| 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 伊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。 |
| 关键词: 调幅加网 全息 网点形状 防伪 |
| DOI： |
| 分类号:TS865 |
| 基金项目: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) |
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| Halftone Holographic Anti-counterfeiting Algorithm Based on Dot Shape |
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HAO Fa-yi, DENG Kai-fa
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University of Shanghai for Science and Technology, Shanghai 200093, China
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| Abstract: |
| 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 伊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. |
| Key words: FM screening holographic dot shape security |
