Method and circuit for controlling white balance in a video sign

Details Method and circuit for controlling white balance in a video sign Method and circuit for controlling white balance in a video sign

1993-06-25

1995-02-14

Groody, James J.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348655, H04N 973

Patent

active

053899709

ABSTRACT:
A circuit for controlling white balance in a video signal comprising separators for separating a luminance signal, a red signal and a blue signal from the video signal, gain control amplifiers for amplifying the separated red signal and the separated blue signal, substractors for making a red minus luminance signal and a blue minus luminance signal from the luminance signal, the amplified red signal and the amplified blue signal, integrators for integrating the luminance signal, the red minus luminance signal and the blue minus luminance signal, switching circuit, coupled between the substractors and the integrators, for switching outputs of the substractors to supply the luminance signal, the red minus luminance signal and the blue minus luminance signal having only levels under predetermined levels to the integrators, and microcomputer for determining whether the outputs of the integrators belong to a certain white area, to control gains of said gain cortrol amplifiers when the ouput of the integrators belong to the certain of white area.

REFERENCES:
patent: 4727413 (1988-02-01), Miura et al.
patent: 4883360 (1989-11-01), Kawada et al.
patent: 5099316 (1992-03-01), Ogawa
patent: 5170247 (1992-12-01), Takagi et al.
patent: 5177599 (1993-01-01), Takagi et al.
patent: 5223921 (1993-06-01), Haruki et al.

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