All optical nonlinear joint fourier transform correlator

Details All optical nonlinear joint fourier transform correlator All optical nonlinear joint fourier transform correlator

1993-09-20

1997-02-18

Dzierzynski, Paul M.

Optical: systems and elements

Diffraction

Using fourier transform spatial filtering

359561, 359 7, 359 29, G02B 2746, G03H 102, G03H 116

Patent

active

056046340

ABSTRACT:
A fully parallel, self-aligning, nonlinear and all optical joint transform correlator utilizes a photorefractive four wave mixer positioned to record the joint transform spectrum interfering with a reference beam together with a phase conjugator which directs a readout beam at the four wave mixer. The signal readout of the mixer is Fourier transformed and can be recorded upon an image sensor to detect the correlation spots indicating the degree of similarity of the two input images.

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patent: 5175775 (1992-12-01), Iwaki et al.
patent: 5282067 (1994-01-01), Liu

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