Diffractive optically variable image devices (DOVIDs) have become the primary overt authentication or security feature on protected documents and products, apart from the substrate itself and the printed design − which are the oldest but still effective authentication features. But their efficacy is being compromised by false expectations and counterfeits. It is therefore necessary to establish a clear statement of the role of DOVIDs and their function in the inspection and protection of suspect items, which will also apply to other optical security devices (OSDs).

Date Published: 9 February 2006
PDF: 7 pages
Proc. SPIE 6075, Optical Security and Counterfeit Deterrence Techniques VI, 60750O (9 February 2006); doi: 10.1117/12.648416

Published in SPIE Proceedings Vol. 6075:
Optical Security and Counterfeit Deterrence Techniques VI
Rudolf L. van Renesse, Editor(s)