An optical method for document protection against counterfeit

Jacek Janucki; Jan Owsik

doi:10.1117/12.578035

29 December 2004 An optical method for document protection against counterfeit

Jacek Janucki, Jan Owsik

Proceedings Volume 5615, Technologies for Optical Countermeasures; (2004) https://doi.org/10.1117/12.578035
Event: European Symposium on Optics and Photonics for Defence and Security, 2004, London, United Kingdom

Abstract

The optical method for document protection against counterfeit has been proposed. It is based on the use of optically variable graphics. For the security device design the numerical computation algorithm has been formulated. The algorithm is founded on the coupled-waves theory of the light diffraction by gratings. The computation example for the holographic foil design is demonstrated.

Citation Download Citation

Jacek Janucki and Jan Owsik "An optical method for document protection against counterfeit", Proc. SPIE 5615, Technologies for Optical Countermeasures, (29 December 2004); https://doi.org/10.1117/12.578035

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