Luminescent security feature and method and device for examining it
作者： Hofer Christoph , Reinhardt Jonas , Cattaneo Stefano
DOI:
关键词: Luminescence 、 Optics 、 Frequency modulation 、 Feature (computer vision) 、 Physics 、 Excitation 、 Pixel 、 Measure (physics)
摘要: A security feature has a plurality of luminescent surface elements, wherein luminescence lifetime varies between the elements. In order to verify feature, lock-in imager is used. The illuminated with excitation light, which intensity-modulated modulation frequency. light emitted by detected synchronously frequency in pixels. This used determine measure phase shift and different verified taking account
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