Projection and scanning system for producing video signals from

Details Projection and scanning system for producing video signals from Projection and scanning system for producing video signals from

1980-03-31

1981-10-20

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 336

Patent

active

042964385

ABSTRACT:
A projection and scanning system for synchronization of photographic film projection with vertical sync pulses is taught. In this system, developed photographic film is advanced into a projection gate which is larger than the vertical height of an individual photographic frame. As a given film frame passes through the projection gate, it is repeatedly scanned by a mirror and the projected image reflected onto a charge-coupled image sensor which can be used to provide information for a video signal. Perforations on the film enable pulses to be developed at a photocell which are a function of film speed. By processing these pulses, along with vertical sync pulses and appropriate control waveforms, accurate scanning of the film can be achieved, enabling video signals resulting in flickerless television transmissions to be generated.

REFERENCES:
patent: 3804978 (1974-04-01), Lemelson

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