30 September 2003 Card validation using an optoelectronic module based on optical correlation
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The use of optical correlation for pattern recognition represents a strong tool when high speed and accurate signal processing is required. On the other hand, the product security requires new sophisticated elements in order to avoid the product counterfact. Following this idea a method based on phase masks has been proposed in the last decade to allow card security. Recently, the validation of the security phase masks has been implemented optically in a joint transform correlator. The reference mask and the mask to be validated are introduced in the same object plane and the optical Fourier transform is performed simultaneously for both of them. The spectrum intensity is then processed digitally by a PC to evaluate the correlation signal between the reference and the card to be validated. In this paper we present some considerations regarding the optimal setup for card validation and the use of phase masks combined with amplitude masks.
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Radu Swider, Radu Swider, Gheorghe Croitoru, Gheorghe Croitoru, Dan Cojoc, Dan Cojoc, "Card validation using an optoelectronic module based on optical correlation", Proc. SPIE 5227, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies, (30 September 2003); doi: 10.1117/12.519801; https://doi.org/10.1117/12.519801

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