Image analysis – Color image processing – Color correction
Patent
1997-03-21
2000-08-08
Nguyen, Madeleine
Image analysis
Color image processing
Color correction
358521, G06K 900, G03F 308
Patent
active
061012718
ABSTRACT:
The gradation correction device includes a luminance signal convertor to generate a luminance signal from the input R, G, B signals, a correction coefficient calculator which calculates the ratio to the luminance signal of the luminance signal after gamma correction to the predetermined gradation characteristics, and a multipliers to multiply the output from the correction coefficient calculator by each of the R, G, and B input signals. When the gradation correction is applied, effective brightness adjustment can be applied with no change in hue and saturation and without exceeding the dynamic range of a device.
REFERENCES:
patent: 3875583 (1975-04-01), Poetsch et al.
patent: 4812903 (1989-03-01), Wagensonner et al.
patent: 4831434 (1989-05-01), Fuchsberger
patent: 4833527 (1989-05-01), Kondo
patent: 4962419 (1990-10-01), Hibard et al.
patent: 4965664 (1990-10-01), Udagawa et al.
patent: 4975786 (1990-12-01), Katayama et al.
patent: 4992862 (1991-02-01), Gabor
patent: 5166740 (1992-11-01), Trew
patent: 5194943 (1993-03-01), Tomita et al.
patent: 5196937 (1993-03-01), Kageyama
patent: 5287209 (1994-02-01), Hiratsuka et al.
patent: 5296920 (1994-03-01), Sakaue et al.
patent: 5517333 (1996-05-01), Sakaue et al.
patent: 5661575 (1997-08-01), Yamashita et al.
Ishihara Hideshi
Matsumoto Yasuki
Yamashita Haruo
Matsushita Electrial Industrial Co., Ltd
Nguyen Madeleine
LandOfFree
Gradation correction method and device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gradation correction method and device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gradation correction method and device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1157792