Pattern recognizing apparatus

Image analysis – Histogram processing – For setting a threshold

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382 18, 382 25, G06K 962

Patent

active

054106133

ABSTRACT:
A pattern recognizing apparatus includes an image pick-up device for picking up an image of a component for teaching and an image of a component to be recognized, and a feature value calculating device for calculating a feature value based on the image picked up by the image pick-up device. Also provided is a processing control device for outputting a teaching signal indicating a processing rule to be applied to the components for teaching, a histogram forming device for receiving the teaching signal and the feature value calculated based on the image of the component to be recognized and forming a histogram of the feature value of the rule based on the teaching signal and the received feature value, and a membership function forming device for forming a membership function which includes a noise eliminating device for performing linear interpolation to valleys of the histogram, and a threshold processing device for changing the histogram to a membership function through a threshold process. A calculating device is provided for finding a membership value based on the feature value calculated by the image of the component to be recognized based on the membership function formed by the membership function forming device, and calculating an acceptance of fit of the rule applied to the component to be recognized. A selecting device is provided for selecting a rule having the maximum acceptance of fit to decide a pattern of the component to be recognized. The apparatus calculates the acceptance of fit of a pattern on the basis of the membership value of the shape feature value, so that the membership function can be formed efficiently.

REFERENCES:
patent: 4288779 (1981-09-01), Otsu et al.
patent: 4757551 (1988-07-01), Kobayashi et al.
patent: 4941192 (1990-07-01), Mishima et al.
patent: 5058182 (1991-10-01), Kuan et al.
patent: 5127063 (1992-06-01), Nishiya et al.

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