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| 分通道相位调制潜像法防伪效果的评价 |
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王天马, 王琪, 刘洪豪
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南京林业大学，南京 210037
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| 摘要: |
| 目的 以图像半色调加网原理为理论基础， 运用相位调制潜像技术实现一种光栅防伪方法。方法 设计原图与潜像， 对其设置加网参数进行数字加网， 在C， M， Y， K通道分别嵌入潜像作为防伪母版， 根据加网线数的不同， 设计具有对应周期的数字光栅， 而后与防伪母版进行适当角度覆合完成防伪信息的提取。用加权信噪比（WSNR）和彩色图像结构相似度法（CISI）， 分别评价各通道潜像的隐蔽性及信息提取的差异。结果 隐藏信息的隐蔽性好， 隐藏信息提取再现清晰。结论 该防伪方法对于图像加网线数无明显选择性， 而通道对于防伪效果有明显影响。K通道中的潜像隐蔽性最差， 不适合作为防伪母版。M和C通道中潜像的提取效果最好， 是该防伪方法的适用通道。 |
| 关键词: 半色调 光栅防伪 图像评价 |
| DOI： |
| 分类号:TS801.3 |
| 基金项目: |
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| Evaluation of Latent Image Anti-counterfeiting Effect Based on Sub-channel Phase Adjustment |
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WANG Tian-ma, WANG Qi, LIU Hong-hao
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Nanjing Forestry University， Nanjing 210037， China
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| Abstract: |
| The aim of this study was to realize image anti-counterfeiting grating by phase adjustment latent image technology using the halftone image screening principle as the theoretical basis. Firstly, original artwork and latent image were designed, screening parameters were set up for digital screening, latent image was embedded respectively in C,M,Y,K channels as security master. Secondly, digital grating with corresponding period was designed according to the difference of screen ruling, and then combined with security master to finish the extraction of security information. Finally, the latent image concealment and information extraction effect of each channel were evaluated using the weighted signal to noise ratio (WSNR) and color image structure similarity method (CISI). The concealment of the hidden information was good and the extraction and reproduction of the hidden information was clear. This method had no obvious selectivity towards screen ruling of the image, while sub-channel had a significant impact on the anti-counterfeit effect. K channel had the worst latent concealment, and was not suitable as a security master. Channels M and C had the best latent extraction effect, and were suitable channels of the anti-counterfeiting method. |
| Key words: halftone grating anti-counterfeiting image evaluation |
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