Television – Camera – system and detail – Optics
Patent
1996-12-30
1999-03-02
Tran, Thai
Television
Camera, system and detail
Optics
348229, 348220, H04N 5235
Patent
active
058778101
ABSTRACT:
The levels of video signals obtained by photography at a relatively high shutter speed and photography at an ordinary shutter speed are made approximately equal at all times, irrespective of any change in the characteristics of an AGC. Photography performed at a relatively high shutter speed of one time in a plurality of fields and photography is performed at an ordinary speed at other times is repeated periodically. One field of a luminance signal obtained by photography at the relatively high shutter speed is integrated by a first integrating circuit, and one field of the luminance signal obtained by photography at the ordinary shutter speed is integrated by a second integrating circuit, wherein the luminance signals represent contiguous images. A signal representing the difference between these integrated values is produced by a difference detecting circuit. The difference signal serves as a gain correction signal. The gain correction signal is added to a gain control signal, and the resulting signal is applied to the AGC. The gain control signal of the AGC is corrected by the gain correction signal so that the average level of the video signal resulting from photography at the relatively high shutter speed and the average level of the video signal resulting from photography at the ordinary shutter speed become approximately equal in the AGC.
REFERENCES:
patent: 4881127 (1989-11-01), Isoguchi
patent: 4984002 (1991-01-01), Kokubo
patent: 5140420 (1992-08-01), Hurst
patent: 5153729 (1992-10-01), Saito
patent: 5157502 (1992-10-01), Nakajima et al.
patent: 5173779 (1992-12-01), Lee
patent: 5258848 (1993-11-01), Kondo et al.
patent: 5311311 (1994-05-01), Harigai et al.
patent: 5331949 (1994-07-01), Funakoshi et al.
patent: 5559552 (1996-09-01), Inuiya et al.
Inuiya Masafumi
Misawa Takeshi
Fuji Photo Film Co. , Ltd.
Moe Aung S.
Tran Thai
LandOfFree
Video camera, printer apparatus and method of controlling same, does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Video camera, printer apparatus and method of controlling same, , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video camera, printer apparatus and method of controlling same, will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-427347