发明授权
US4296438A Projection and scanning system for producing video signals from motion picture film and control system used therein 失效
用于从其中使用的电影胶片和控制系统产生视频信号的投影和扫描系统

Projection and scanning system for producing video signals from motion
picture film and control system used therein
摘要:
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.
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