Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-03-05
1993-08-31
Powell, Mark R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358458, H04N 140, H04N 5202
Patent
active
052413861
ABSTRACT:
In a video signal gradation corrector used in a television receiver, an output of a look-up table memory is supplied to a constant-multiplication circuit, an output signal of the constant-multiplication circuit and an output signal of a look-up table operating circuit are added by an adder, and the result of addition is set into the look-up table memory. Further, a video scene change detecting circuit is provided between an output terminal of the look-up table operating circuit and a coefficient control terminal of the constant-multiplication circuit, and a coefficient of the constant-multiplication circuit is changed in accordance with a change in video scene. Thereby, a correction is made which is not affected by noises, is stable and smooth, and follows the change in video scene.
REFERENCES:
patent: 3979555 (1976-09-01), Opittek et al.
patent: 4353092 (1982-10-01), Bailey et al.
patent: 4639783 (1987-01-01), Fling
patent: 4731863 (1988-03-01), Sezan et al.
patent: 4931864 (1990-06-01), Kawamura et al.
patent: 5053888 (1991-10-01), Nomura
Kageyama Atsuhisa
Tsuji Toshiaki
Matsushita Electric - Industrial Co., Ltd.
Powell Mark R.
LandOfFree
Video signal gradation corrector providing smooth correction whi 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 signal gradation corrector providing smooth correction whi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video signal gradation corrector providing smooth correction whi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2301570