Method and apparatus for optical pattern recognition

Details Method and apparatus for optical pattern recognition Method and apparatus for optical pattern recognition

1993-10-06

1997-04-08

Couso, Jose L.

Image analysis

Image transformation or preprocessing

Correlation

382280, 382210, 359559, 359561, G06F 15336, G06K 974

Patent

active

056195966

ABSTRACT:
An object of the invention is to provide a method and a apparatus for optical pattern recognition capable of accurately comparing and identifying a reference image accurately at a real-time even when the input image rotates or its size changes by being compared with a reference image that is a desirous target. The method and apparatus comprise the processes of; steps (6, 11) for independently obtaining a lower-frequency component and a higher-frequency component from a joint Fourier transform image 5 of the reference image 4 and the input image 3; steps (10, 15) for calculating correlation coefficients respectively from the lower-frequency component and the higher-frequency component; step (16) for obtaining a ratio of the respective correlation coefficients; and step (19) for identifying and comparing a correlation coefficient ratio of the two same reference images to be required with a correlation coefficient ratio obtained from step (16).

REFERENCES:
patent: 3779492 (1973-12-01), Grumet
patent: 5168382 (1992-12-01), Tsujikawa
patent: 5175775 (1992-12-01), Isaki et al.
patent: 5214508 (1993-05-01), Stevens
patent: 5216541 (1993-06-01), Takesue et al.
patent: 5274716 (1993-12-01), Mitsuoka et al.

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