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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 14, Iss. 13 — Jul. 1, 1989
  • pp: 659–661

Fresnel lens-encoded binary phase-only filters for optical pattern recognition

Jeffrey A. Davis, Don M. Cottrell, Jeffrey E. Davis, and Roger A. Lilly  »View Author Affiliations


Optics Letters, Vol. 14, Issue 13, pp. 659-661 (1989)
http://dx.doi.org/10.1364/OL.14.000659


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Abstract

We describe a technique for reducing false signals from optical correlators using binary phase-only filters (BPOF's). Since the impulse-response function of the BPOF contains both the target object and the inverted version of it, the output consists of the correlation of the input object with both of these objects. In our research a Fresnel phase plate lens is encoded onto the BPOF. As a result the correlation with the desired target is on a converging beam, and the correlation with the undesired inverted image of the target is on a diverging beam. Experimental results show that these filters reject inverted input objects.

© 1989 Optical Society of America

History
Original Manuscript: November 18, 1988
Manuscript Accepted: March 31, 1989
Published: July 1, 1989

Citation
Jeffrey A. Davis, Don M. Cottrell, Jeffrey E. Davis, and Roger A. Lilly, "Fresnel lens-encoded binary phase-only filters for optical pattern recognition," Opt. Lett. 14, 659-661 (1989)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-14-13-659


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