Holographic correlator array with selectable shift invariance

Michael Levene; Gregory J. Steckman; Demetri Psaltis

doi:10.1117/12.326862

9 October 1998 Holographic correlator array with selectable shift invariance

Michael Levene, Gregory J. Steckman, Demetri Psaltis

Proceedings Volume 3470, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications IV; (1998) https://doi.org/10.1117/12.326862
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Optical holographic correlators can perform many correlations simultaneously. Because the output plane must be divided among the individual templates in the system, for many systems shift-invariance limits the number of correlation templates than can be stored in one correlator. 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. This paper describes a technique to control the shift-invariance of a correlator system by moving the holographic material away from the Fourier plane.

Citation Download Citation

Michael Levene, Gregory J. Steckman, and Demetri Psaltis "Holographic correlator array with selectable shift invariance", Proc. SPIE 3470, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications IV, (9 October 1998); https://doi.org/10.1117/12.326862

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