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Proceedings Paper

Ordering the order: a survey of optical document security features
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Paper Abstract

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.

Paper Details

Date Published: 12 April 1995
PDF: 8 pages
Proc. SPIE 2406, Practical Holography IX, (12 April 1995); doi: 10.1117/12.206227
Show Author Affiliations
Rudolf L. van Renesse, TNO Institute of Applied Physics (Netherlands)

Published in SPIE Proceedings Vol. 2406:
Practical Holography IX
Stephen A. Benton, Editor(s)

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