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12 April 1995 Ordering the order: a survey of optical document security features
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Proceedings Volume 2406, Practical Holography IX; (1995)
Event: IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1995, San Jose, CA, United States
Until the appearance of the color copier, security features were optically invariable devices (OIDs). Nowadays, deceptive color copies of OIDs can be made. Optical variability however, is unattainable by the color copier. Optically variable devices (OVDs) are either based on specular reflection (metallic foils), diffraction (holograms, etc.) or interference (thin films, Bragg structures, etc.). A classification of OIDs and OVDs is presented. It is proposed that the degree of microstructural order of an optical feature is an approximate measure of its practical value for document security.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Rudolf L. van Renesse "Ordering the order: a survey of optical document security features", Proc. SPIE 2406, Practical Holography IX, (12 April 1995);

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