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Proceedings Paper

Protecting identity documents with a just-noticeable microstructure
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Paper Abstract

The development of plastic card printers has led to the widespread use of identity documents printed on plastic cards, such as ID cards, driving licenses and access key cards. This paper presents a new security feature based on a technique for embedding a personalized microstructure into a photograph. This microstructure takes the form of a bitmap pattern embedded into the original photograph as a succession of balanced chromatic shifts. The amplitude of these shifts may be modulated so as to make the pattern fully apparent, just noticeable, or completely invisible under normal viewing conditions. Since the chromatic shifts cancel each other out in any macroscopic portion of the image, the global appearance of the protected image remains intact. The embedded microstructure may be adapted to each instance of the protected identity document. For example, it can repeat textual information already present elsewhere on the document, or it can include a code derived from data specific to the document holder. Furthermore, this information may be made fully readable without the help of a specialized apparatus. Such identity documents exhibit an intrinsic resistance against imitation, tampering and substitution.

Paper Details

Date Published: 19 April 2002
PDF: 9 pages
Proc. SPIE 4677, Optical Security and Counterfeit Deterrence Techniques IV, (19 April 2002); doi: 10.1117/12.462739
Show Author Affiliations
Nicolas Rudaz, Ecole Polytechnique Federale de Lausanne (Switzerland)
Roger David Hersch, Ecole Polytechnique Federale de Lausanne (Switzerland)

Published in SPIE Proceedings Vol. 4677:
Optical Security and Counterfeit Deterrence Techniques IV
Rudolf L. van Renesse, Editor(s)

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