Television – Special applications – Film – disc or card scanning
Patent
1994-09-26
1996-06-18
Greening, Wendy R.
Television
Special applications
Film, disc or card scanning
348363, 354270, H04N 5253
Patent
active
055282881
ABSTRACT:
In an illumination system for a film telecine scanner of the type adapted to provide a line of illumination on the image frames of a film which is supported for movement in a film gate of the scanner, an improved light control system for adjusting the amount of light that is delivered from a light source to an integrating cylinder to take into account fluctuations in intensity of the light source and desired intensity changes in the line of illumination upon a change of scene in the image frames of the film as the film is being scanned. The light control system comprises an aperture defining mechanism, a position servo regulator that maintains the aperture at a desired aperture opening despite disturbances tending to change the aperture between aperture changes, and an intensity servo regulator that takes into account the lamp intensity in resetting the aperture to a new position in response to a commanded light intensity related to a scene change, whereby aperture changes may be effected within the time of scanning a single image frame. The aperture defining mechanism employs first and second movable blades placed at a location in the optical path and movable between a full open aperture position outside the optical path and to one of a plurality of stopped down aperture defining positions interrupting the optical path and the resulting illumination line intensity in the course of scanning a single image frame.
REFERENCES:
patent: 3962707 (1976-06-01), Galbraith
patent: 3980407 (1976-09-01), Hill
patent: 4118714 (1978-10-01), Okajima et al.
patent: 4290675 (1981-09-01), Beiser
patent: 4531820 (1985-07-01), Petersen
patent: 4558368 (1985-12-01), Aoki et al.
patent: 4688099 (1987-08-01), Funston
patent: 4710013 (1987-12-01), Wong
patent: 4868383 (1989-09-01), Kurtz et al.
patent: 4875103 (1989-10-01), Bridges et al.
patent: 4884091 (1989-11-01), Nakagomi al.
patent: 4899040 (1990-02-01), Davis et al.
patent: 4959978 (1990-09-01), Takahashi et al.
patent: 4974068 (1990-11-01), Hiramatsu et al.
patent: 5003379 (1991-03-01), Moore, Jr. et al.
patent: 5010410 (1991-04-01), Bernstein
patent: 5012346 (1991-04-01), DeJager et al.
patent: 5023723 (1991-06-01), Date et al.
patent: 5038216 (1991-08-01), Easterly et al.
patent: 5072162 (1991-12-01), Sato et al.
patent: 5081535 (1992-01-01), Kondo et al.
patent: 5084754 (1992-01-01), Tomitaka
patent: 5084755 (1992-01-01), Ozaki
patent: 5115319 (1992-03-01), Arai et al.
patent: 5122880 (1992-06-01), Nagano
patent: 5155596 (1992-10-01), Kurtz et al.
patent: 5161026 (1992-11-01), Mabuchi et al.
patent: 5184227 (1993-02-01), Foley
patent: 5414460 (1995-05-01), Neistit et al.
Kurtz et al., "Optical scanning system for a CCD telecine for HDTV", SPIE, vol. 1448, pp. 191-205 (1991).
URSA Product Brochure, Rank Cintel Ltd., Hertfordshire, U.K., dated Jan. 9, 1989.
Divito Charles P.
Kurtz Andrew F.
Sandor Richard J.
Sitter Steven
Summers Drew D.
Breimayer Joseph F.
Eastman Kodak Company
Greening Wendy R.
Shalwala Bipin
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