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Authenticity checking system for identity cards - with halogram and direct image superimposed for comparison and using conventional light source with chopper
Authenticity checking system for identity cards - with halogram and direct image superimposed for comparison and using conventional light source with chopper
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机译:身份证的真实性检查系统-全息图和直接图像叠加在一起用于比较,并使用带有斩波器的传统光源
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摘要
Credit cards, identity cards etc. are checked for authenticity by direct comparison of an optical image with a reconstructed hologram of the card. The optical image and the hologram reconstruction are projected superimposed on one another in the same image plane. Pref. if the light sources for the optical image and the hologram reconstruction are of different colour, one source is filtered to match its colour to the other. The brightness of the image and the hologram are also pref. matched to each other. The hologram reconstruction is pref. projected continuously and the image intermittently.
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