Optical associative identifier with real time joint transform co

Details Optical associative identifier with real time joint transform co Optical associative identifier with real time joint transform co

1990-05-08

1993-06-01

Arnold, Bruce Y.

Optical: systems and elements

Diffraction

Using fourier transform spatial filtering

359559, 382 31, 382 42, G02B 2746, G06K 974

Patent

active

052165418

ABSTRACT:
An optical associative identifier is disclosed which is used to determine the closest match between an image to be identified and a plurality of reference images. The identifier includes a display area for displaying the various images, the display area additionally functioning as a spatial light modulator. First and second optical Fourier transform devices are included which are used to compare the reference images to the image to be identified. The output light intensity of each of the reference images is modulated in accordance with a two-dimensional intensity distribution corresponding to the correlation between the image to be identified in each of the reference images. Based upon a comparison of these output light intensities, a match between the image to be identified and one of the reference images can be made.

REFERENCES:
patent: 4462046 (1984-07-01), Spight
patent: 4707077 (1987-11-01), Marom
patent: 4955691 (1990-09-01), Mifune et al.
patent: 4958376 (1990-09-01), Leib
patent: 4961615 (1990-10-01), Owechko et al.
"A Technique for Optically Convolving Two Functions", C. W. Weaver and J. W. Goodman, Applied Optics, vol. 5, No. 7 pp. 1248-1249, Jul. 1966.
"A Real-Time Programmable Joint Transform Correlator". F. T. S. Yu and X. J. Lu, Optics Communications, vol. 52, No. 1, pp. 10-16, Nov. 1, 1984.

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