Optical inspection techniques for security instrumentation

Rudolf L. van Renesse

doi:10.1117/12.235457

15 March 1996 Optical inspection techniques for security instrumentation

Rudolf L. van Renesse

Proceedings Volume 2659, Optical Security and Counterfeit Deterrence Techniques; (1996) https://doi.org/10.1117/12.235457
Event: Electronic Imaging: Science and Technology, 1996, San Jose, CA, United States

Abstract

This paper reviews four optical inspection systems, in which development TNO Institute of Applied Physics was involved: (1) intaglio scanning and recognition, (2) banknote quality inspection, (3) visualization and reading of a finger pattern, and (4) 3DAS authentication. (1) Intaglio is reserved for high security printing. It renders a tactile relief that can be recognized by a laser scanning technique. This technique is applied by various national banks to detect counterfeit banknotes returning from circulation. A new system is proposed that will detect intaglio on arbitrary wrinkled banknotes. (2) A banknote fitness inspection system (BFIS) that inspects banknotes in specularly reflected light is described. As modern banknotes are provided increasingly with reflective security foils, a new system is proposed that inspects banknotes in specular and diffuse reflection, as well as in transmission. (3) An alternative visualization method for visualization of finger patterns is described, employing a reflective elastomer. A CD scanning system reads the finger patterns. (4) A nonwoven structure has two advantageous properties for card authentication: a random structure which renders each few square millimeters of the pattern uniqueness (identification) and a 3D structure which makes it virtually impossible to be counterfeited (authentication). Both properties are inspected by an extremely simple lenseless reader.

Citation Download Citation

Rudolf L. van Renesse "Optical inspection techniques for security instrumentation", Proc. SPIE 2659, Optical Security and Counterfeit Deterrence Techniques, (15 March 1996); https://doi.org/10.1117/12.235457

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