| 摘要: |
| 目的 研究借助光栅材料实现高档印品的防伪技术。 方法 结合光栅材料特殊的光学特性和半色调图像加网技术,提出隐形潜像防伪技术,采用最小阈值矩阵的原理,实现变角度加网防伪技术。详细论述每种防伪技术的原理,分别使用 Photoshop 和 Matlab 编程模拟来实现这些算法。 结果 以EPSON Stylus Pro7880 C 为图像输出设备,在隐形潜像防伪技术中,当光栅片线条角度与印刷品呈 45 o或 135 o 时,可以清晰看到隐藏的潜像信息;在变角度加网中,使用对应光栅在特定角度 21 . 14 o 条件下叠加在含水印图像上,清楚地观察到了防伪信息。 结论 通过实验,表明光栅隐形潜像防伪技术在印品防伪中具有较好的应用效果。 |
| 关键词: 半色调图像 隐形潜像防伪 阈值矩阵 变角度加网 |
| DOI： |
| 分类号:TS853+.6 |
| 基金项目:浙江省高职高专院校中青年专业带头人专业领军项目(LJ2013153);浙江省科技厅2012年新产品试制计划(2012D60SA300008,2012D60SA300008);浙江省高等教育教学改革研究项目(jg2013348);温州工业科技项目(G20130005) |
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| Grating Anti-counterfeit Technology for High-end Printing |
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TANG Zhu-bin, XIAO Zhi-jian
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Zhejiang Dongfang Vocational and Technical College, Wenzhou 325011, China
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| Abstract: |
| Objective To study the anti-counterfeit technology for high-end printing through grating materials. Methods Combined with special optical properties of grating material and halftone image screening technology, invisible latent image anti -counterfeit technology was presented, and based on the minimum threshold matrix theory, variable angle screening anti-counterfeit technology was achieved. The principles of each anti-counterfeiting technology were discussed in detail, and these algorithms were implemented based on photoshop and matlab programming. Results EPSON Stylus Pro7880C was used as the image output device. In the invisible latent image anti-counterfeiting technology, when the grating line screen angle on printing was 45o or 135o , the hidden latent image information could be clearly seen. During the variable angle technology, the corresponding grating was superimposed on the watermarked image with a specific angle of 21. 14o , the anti-counterfeit information could be clearly observed. Conclusion Experiments showed that raster invisible latent anti-counterfeiting technology had a good performance in security printing. |
| Key words: halftone image invisible latent image anti-counterfeiting threshold matrix theory variable angle screening |
