Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1992-09-16
1994-03-22
Powell, Mark R.
Television
Image signal processing circuitry specific to television
Gray scale transformation
358521, 358519, H04N 969
Patent
active
052969207
ABSTRACT:
A gradation correction apparatus for processing R, G, and B input signals includes a luminance signal conversion device for obtaining the original luminance signal, which is before gamma conversion, from the input signals, a luminance gamma conversion device for gamma converting the original luminance signal to the desired gradation characteristics to obtain a gamma converted luminance signal, a correction coefficient calculation means for obtaining a ratio of the gamma converted luminance signal to the original luminance signal, a first RGB operation means for multiplying the ratio by each of the R, G, and B input signals for obtaining primary gradation-corrected R, G, and B signals; a color difference signal operation means for producing a difference between each of the R, G, and B input signals and the original luminance signal; a second RGB operation means for adding the gamma converted luminance signal to each of the difference for obtaining secondary gradation-corrected R, G, and B signals; and an RGB determination means for obtaining final gradation-corrected R, G, B signals based on the primary and secondary gradation-corrected R, G, and B signals.
REFERENCES:
patent: 4086615 (1978-04-01), Koubek
patent: 4668979 (1987-05-01), Jung
patent: 4697208 (1987-09-01), Eino
patent: 4812903 (1989-03-01), Wagonsonner et al.
patent: 4831434 (1989-05-01), Fuchsberger
patent: 4837612 (1989-06-01), Miller
patent: 4841360 (1989-06-01), Birgmeir
Ishihara Hideshi
Maruno Susumu
Matsumoto Yasuki
Sakaue Shigeo
Yamashita Haruo
Matsushita Electric - Industrial Co., Ltd.
Powell Mark R.
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