High luminance color suppression circuit

Details High luminance color suppression circuit High luminance color suppression circuit

1995-04-13

1996-10-08

Peng, John K.

Television

Image signal processing circuitry specific to television

Chrominance signal amplitude control

348646, 348649, 348256, H04N 968, H04N 977

Patent

active

055636667

ABSTRACT:
It is an object to avoid suppression of color signals before a green color signal G reaches a saturation detection level Gdet or before each of color signals R and B reaches its saturation level to thereby substantially faithfully reproduce color of an object. To this end, a high luminance color suppressing circuit includes a virtual luminance signal generator for generator for generating a virtual luminance signal Y based on at least one signal of input color signals Rin, Gin and Bin, a coefficient generator for generating a first through a third coefficient K.sub.1 through K.sub.3 based on a saturation detection level Gdet, a virtual detection level Gth, and maximum output levels Rmax and Bmax, and an output color signal generator for generating output color signals Rout, Gout and Bout based on the virtual luminance signal Y, a minimum coefficient K.sub.0 and the color signals Rin, Gin and Bin.

REFERENCES:
patent: 4712132 (1987-12-01), Soca
patent: 4754323 (1988-06-01), Kaji et al.
patent: 4831434 (1989-05-01), Fuchsberger
patent: 4996590 (1991-02-01), Okamoto et al.
patent: 5045928 (1991-09-01), Takaiwa et al.
patent: 5337083 (1994-08-01), Murata et al.
patent: 5440341 (1995-08-01), Suzuki et al.

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