Method and apparatus for a rotating shutter in real-time film-to

Details Method and apparatus for a rotating shutter in real-time film-to Method and apparatus for a rotating shutter in real-time film-to

1993-04-28

1994-12-27

Razavi, Michael T.

Television

Special applications

Film, disc or card scanning

348 97, H04N 340, H04N 5253

Patent

active

053769619

ABSTRACT:
A telecine system for converting motion picture film to video contains a pulldown mechanism and a rotating shutter. The telecine system creates a 3-2 film frame to video frame conversion. The pulldown mechanism transports the film and the rotating shutter exposes the film to a video camera. The pulldown mechanism contains a film aperture and a pin registration system. The film is transported over the film aperture during a pulldown period, and the pin registration system provides precise placement of the film frame over the film aperture. The pulldown periods occur during constant intervals. During a register period of the telecine system, the single film frame is held steady over the film aperture. A rotating shutter contains five apertures wherein each aperture is used to expose a film frame to the camera. The shutter exposes a diffused light source to the film frame such that a first single frame is exposed for three video fields after a first pulldown period, and a second single frame is exposed for two video fields after a second pulldown period for each rotation of the rotating shutter.

REFERENCES:
patent: 3796828 (1974-03-01), Barboni et al.
patent: 4255764 (1981-03-01), Howe
patent: 4338634 (1982-07-01), Dillon et al.
patent: 5099334 (1992-03-01), Ogata et al.
patent: 5191427 (1993-03-01), Richards et al.
patent: 5194958 (1993-03-01), Pearman et al.
patent: 5260787 (1993-11-01), Capitant et al.

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