Method of judging film frame position

Details Method of judging film frame position Method of judging film frame position

1985-06-04

1986-09-16

Gellner, Michael L.

Photocopying

Projection printing and copying cameras

Identifying, composing, or selecting

355 77, 250557, 250571, G03B 2752

Patent

active

046119078

ABSTRACT:
Disclosed is a film frame position judging method in which film densities are detected by a plurality of sensors disposed such as to be orthogonal to the direction in which a developed film is conveyed, and a frame edge is declared when the distance between the positions at which the OR (logical sum) of light/dark binary signals and the AND (logical product) of the binary signals respectively change as the film is conveyed is within a predetermined value, the light/dark binary signals respectively representing the densities at the detecting points on the film. Accordingly, it is possible to judge a frame position by detecting only one of the film frame edges and to increase the degree of accuracy in judging a frame position.

REFERENCES:
patent: 3469480 (1969-09-01), Nassenstein et al.
patent: 3584224 (1971-06-01), Harlem
patent: 4544842 (1985-10-01), Engemann et al.

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