Method of detecting frame edge

Details Method of detecting frame edge Method of detecting frame edge

1987-12-23

1989-09-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250570, 353 26A, 355 41, G01N 2186, G03B 2312

Patent

active

048641499

ABSTRACT:
A method of detecting a frame edge of a film by a first group of light-receiving element arrays and a second group of light-receiving element arrays, each of the groups being composed of at least one array of light-receiving elements disposed perpendicular to the advancing direction of the film in such a manner as to be parallel with each other. The presence of a frame edge is preliminarily detected by the first group of light-receiving element arrays, and the position of the frame edge is precision-detected by the second group of light-receiving element arrays. Accordingly, since the precision detetction is effected after preliminary detection, the range of precision detection can be narrowed, thereby shortening the detection time.

REFERENCES:
patent: 3778630 (1973-12-01), White et al.
patent: 3809910 (1974-05-01), Nellis
patent: 3881820 (1975-05-01), Muir
patent: 4453823 (1984-06-01), Sugita et al.
patent: 4691112 (1987-09-01), Wydler

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