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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 2 — Jan. 10, 1999
  • pp: 394–398

Method for controlling the shift invariance of optical correlators

Michael Levene, Gregory J. Steckman, and Demetri Psaltis  »View Author Affiliations


Applied Optics, Vol. 38, Issue 2, pp. 394-398 (1999)
http://dx.doi.org/10.1364/AO.38.000394


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Abstract

Holographic correlators can implement many correlations in parallel. For most systems shift invariance limits the number of correlation templates that can be stored in one correlator. This is because the output plane must be divided among the individual templates in the system. When the system is completely shift invariant, the correlation peak from one correlator can shift into an area that has been reserved for a different template; in this case a shifted version of one object might be mistaken for a well-centered version of a different object. We describe a technique for controlling the shift invariance of a correlator system by moving the holographic material away from the Fourier plane.

© 1999 Optical Society of America

OCIS Codes
(070.4550) Fourier optics and signal processing : Correlators

History
Original Manuscript: April 27, 1998
Revised Manuscript: September 15, 1998
Published: January 10, 1999

Citation
Michael Levene, Gregory J. Steckman, and Demetri Psaltis, "Method for controlling the shift invariance of optical correlators," Appl. Opt. 38, 394-398 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-2-394


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References

  1. B. Javidi, P. Réfrégier, eds., Optoelectronic Information Processing, Vol. PM54 of the SPIE Monographs and Handbooks Series (SPIE, Bellingham, Wash., 1997).
  2. C. Gu, J. Hong, S. Campbell, “2-D shift-invariant volume holographic correlator,” Opt. Commun. 88, 309–314 (1992). [CrossRef]
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  4. D. Psaltis, M. Levene, “Optical neural networks,” in Vol. CR55 of SPIE Critical Review Series (SPIE, Bellingham, Wash., 1994), pp. 141–149.
  5. J. D. Jackson, Classical Electrodynamics (Wiley, New York, 1975).

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