Title

Incoherent optical correlators and phase encoding of identification codes for access control or authentication

Keywords

Biometrics; Diffractive optics; Generalized protections algorittms; Incoherent optical correlator; Iterated Fourier transform algorithm; Optical phase encoding; Optical security system; Phase-only filter

Abstract

We show how phase-only filters can be used in incoherent optical correlators for security applications such as access control, identification, or authentication. As a specific example, a biometric signature, a fingerprint, is encoded in a phase-only representation. The phase encoding is accomplished with the method of generalized projections onto constraint sets implemented by an iterated Fourier transform algorithm. The operation of an incoherent optical security system using both a phase-only filter generated with the generalized protections algorithm and a phase-only matched filter is simulated The results demonstrate that the selected access pattern was accepted while a false pattern was rejected by the security system and that better recognition and Discrimination performance was attained with the phase-only filter produced by the generaized projections algorithm. © 1997 society of Photo-Optical Instrumentation Engineers.

Publication Date

1-1-1997

Publication Title

Optical Engineering

Volume

36

Issue

9

Number of Pages

2409-2416

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/1.601414

Socpus ID

0000693684 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0000693684

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