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Proceedings Paper

Optical forensics for tracing counterfeit recorded media
Author(s): Patrick J. Smith; Phelim O'Doherty; Carlos Luna; Sean McCarthy
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Paper Abstract

We describe an optical forensic method for tracing a CD back to the pressing machine in which it was created, and present a system we have developed which maintains a library of the 'fingerprints' of such machines and can compare sample CDs against this library. In principle, any security feature that is deliberately created can be copied by a counterfeiter. In our forensic method we concentrate on features that arise spontaneously in the manufacturing process. Such features act as a signature or 'fingerprint'. In the case of CDs we show how the moulding process leaves an imprint of an unpolished part of the 'mirror plate' on the CD surface. Using machine vision and pattern-matching, we demonstrate the use of the system to acquire a positive match of a sample against a pre-recorded library entry created using a different CD from the same mould.

Paper Details

Date Published: 16 December 2004
PDF: 7 pages
Proc. SPIE 5616, Optics and Photonics for Counterterrorism and Crime Fighting, (16 December 2004); doi: 10.1117/12.578085
Show Author Affiliations
Patrick J. Smith, Fraudhalt Ltd. (Ireland)
Phelim O'Doherty, Fraudhalt Ltd. (Ireland)
Carlos Luna, Fraudhalt Ltd. (Ireland)
Sean McCarthy, Steorn Ltd. (Ireland)


Published in SPIE Proceedings Vol. 5616:
Optics and Photonics for Counterterrorism and Crime Fighting
Tim P. Donaldson; Colin Lewis, Editor(s)

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