Edge location measuring head

Details Edge location measuring head Edge location measuring head

1985-06-17

1987-07-14

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

250557, 250561, 250571, 356375, 358285, 382 48, G06K 900

Patent

active

046808060

ABSTRACT:
A measuring head for detecting the location of an object such as a moving sheet of paper is disclosed. An elongated sensor having multiple light-sensitive elements is located perpendicular to the path of the object. A source of light is directed at the sensor, and those light-sensitive elements which are not in the shadow of the object produce a high output, while those in the shadow produce a low output. Circuit means are provided to provide a count of the elements and to store the count corresponding to the transition between the high and low values. This stored count, which represents the location of the object, is then displayed.

REFERENCES:
patent: 3833816 (1974-09-01), Emura et al.
patent: 4309106 (1982-01-01), Smith
patent: 4317138 (1982-02-01), Bryan et al.
patent: 4326222 (1982-04-01), Connin et al.
patent: 4559452 (1985-12-01), Igaki et al.

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