Film scanner with compensation for film shrinkage

Details Film scanner with compensation for film shrinkage Film scanner with compensation for film shrinkage

1976-04-09

1977-10-18

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 336, H04N 536

Patent

active

040549127

ABSTRACT:
The invention is concerned with a means of compensating for film shrinkage in a continuous film motion telecine apparatus. A measure of the film shrinkage is obtained by deriving a signal representing the angular speed of a roller in non-slipping contact with the film, the film being driven at a constant frame rate by, for example, a smooth capstan servo-controlled to maintain the constant frame rate. The roller whose angular speed is measured may be the drive capstan itself or a separate roller. The signal so derived is dependent on the film shrinkage and thus is used to automatically control a registration adjusting means to compensate for such shrinkage.

REFERENCES:
patent: 2922841 (1960-01-01), Graziano
patent: 3378365 (1968-04-01), Goldmark et al.
patent: 3378635 (1968-04-01), Goldmark et al.

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