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US 4,903,314 AGranted
Single plate compact optical correlator
AssigneeGrumman Aerospace Corporation
InventorJohn V. Fine
Life of this patent
Estimating the term…
Abstract
A single plate compact optical correlator which utilizes a single photographic plate, along with suitable reflectors, wherein the single photographic plate has recorded thereon a multiple holographic lens array, a corresponding multiple matched filter array, and an inverse transform lens.
Claims9
A compact system for an optical correlator which optically compares an input image with optical information stored in a matched filter memory to provide identification and aspect information about the input image, comprising:
- a. means for spatially modulating a reference beam of radiation with an input image to be analyzed to produce a spatially modulated radiation beam;
- b. a unitary optical plate having recorded thereon at least one holographic lens, having the spatially modulated radiation beam incident thereon, for performing a Fourier transformation thereon to obtain at least one Fourier transform of the spatially modulated radiation beam, said unitary optical plate also having recorded thereon at least one matched filter, having the Fourier transform incident thereon, with each matched filter comprising a Fourier transform hologram of an aspect view of an object of interest and passing an optical correlation signal in dependence upon the degree of correlation of the Fourier transform of the spatially modulated radiation beam with the Fourier transform recorded by the matched filter;
- c. at least one inverse Fourier transform lens receiving the optical correlation output of each matched filter, for performing an inverse Fourier transformation on each optical correlation output;
- and
- d. a detector means for detecting the output of the at least one Fourier transform lens and for producing a detector output signal representative thereof.
2 more elements
Dependencies are inferred from the claim text.