Single lens joint transform correlator utilizing a fresnel zone

Details Single lens joint transform correlator utilizing a fresnel zone Single lens joint transform correlator utilizing a fresnel zone

1995-09-29

1997-07-15

Henry, Jon W.

Optical: systems and elements

Diffraction

Using fourier transform spatial filtering

359561, 382210, G02B 2746, G06K 958

Patent

active

056488726

ABSTRACT:
An amplitude encoded lens function signal, similar to a zone plate, is formed in the transform plane of a chirp encoded joint transform correlator. CCD correlation spot light sensor is separated from the transform plane by the focal length of the encoded lens function, and generates the desired output correlation spot. As a result, no prior art inverse transform lens need be provided, which simplifies the design. Further simplification is attainable in a low noise commercial image matching environment by eliminating the CCD correlation spot sensor entirely, and verifying an input image/reference image close match by using the eye of an operator to check for the presence of the visible zone plate, indicative of such a match.

REFERENCES:
patent: 5073006 (1991-12-01), Horner et al.
patent: 5119443 (1992-06-01), Javidi et al.
patent: 5367579 (1994-11-01), Javidi et al.
E. G. Lean et al, "Autocorrelation and Optical Hereodyne Detection", IBM Technical Disclosure Bulletin, vol. 11, No. 5, Oct., 1968, pp. 571-572.
H. Weinberger et al, "Interference Method for Pattern Comparison", Applied Optics, vol. 10, No. 11, Nov., 1971, pp. 2482-2487.

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