Optical pattern recognition apparatus with coordinate conversion

Details Optical pattern recognition apparatus with coordinate conversion Optical pattern recognition apparatus with coordinate conversion

1992-05-20

1996-06-18

Boudreau, Leo

Image analysis

Pattern recognition

Template matching

382280, 382278, 382294, G06K 976

Patent

active

055287026

ABSTRACT:
An optical pattern recognition apparatus has an optical coordinate converter unit which simultaneously and in parallel converts an entered reference image and an entered input image from an entered coordinate system to a desired coordinate system to produce a coordinate-converted reference image and a coordinate-converted input image. A joint transform correlator receives the coordinate-converted reference image and the coordinate-converted input image and generates a correlation coefficient between the coordinate-converted reference image and the coordinate-converted input image so that a correlation between each entered reference and each entered input image is obtained to effect pattern recognition in real time. A feedback circuit normalizes the generated correlation coefficient between the coordinate-converted reference image and the coordinate-converted input image with a maximum correlation coefficient. The feedback circuit changes a subsequently generated correlation coefficient between the coordinate-converted reference image and the coordinate-converted input image depending on the normalized correlation coefficient so that, if the coordinate-converted reference image is obtained from a plurality of entered reference images, a particular entered reference image having the highest correlation with the entered input image is systematically obtained.

REFERENCES:
patent: 5216541 (1993-06-01), Takesue
Casasent. "Real Time Deformation Invariant Optical . . . " Applied Optics; Mar. 1987.
Hudson: "Joint Transform Correlation Using An Optically . . . " Applied Optics; Mar. 10, 1990.
Hossack. "Coordinate Transformations with Multiple . . . " Journal of Modern Optics, vol. 34, No. 9, 1987.
Yu. "Application of a Microchannel Spatial Light . . . " Proceedings of the SPIE: Optical Engineering. vol. 963 pp. 322-326 1989.
Applied Optics, vol. 15, No. 22 Nov. 1989 New York, NY, pp. 4725-4727 F.T.S. Yu et al., "Rotation invariant pattern recognition with a programmable joint transformcorrelator".
Telecommunications and Radio Engineering, vol. 44, No. 5, 1989, Washington, DC, pp. 50-52, A. M. Bereznyy et al., "A pattern recognition system using polar-logarithmic image conversion".
Proc. Computer and Optically Formed Holographic Optics, vol. 1211, Jan. 15, 1990, Los Angeles, CA, pp. 284-295, T. Iwaki et al., "Optical pattern recognition with LAPS-SLM (II)/feedback joint transform correlator using LAPS-SLM".

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