Method and apparatus for a rotating shutter in real-time film-to-video conversion
US5376961A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1993 |
| Grant date | Dec 27, 1994 |
| Priority date | — |
| Expiry date | Apr 28, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/11
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.