Television – Image signal processing circuitry specific to television – Color balance or temperature
Patent
1992-07-31
1994-07-12
Powell, Mark R.
Television
Image signal processing circuitry specific to television
Color balance or temperature
H04N 973
Patent
active
053293614
ABSTRACT:
A white balance control device is provided for use in a video camera or a still video camera in which white balance control signals are controlled so that an object may be photographed without the occurrence of color failure. A microcomputer of the white balance control device detects a difference between integral averaged values for two color difference signals R-Y and B-Y and a reference value. Depending on the difference, values of the white balance control signals Rcont and Bcont may be changed when the brightness of an object is changed by more than a predetermined amount. However, the values are positioned within a variable region and when the values of the white balance control signals Rcont and Bcont become constant, the variable region is renewed.
REFERENCES:
patent: 5040054 (1991-08-01), Schmidt et al.
patent: 5099316 (1992-03-01), Ogawa
patent: 5146316 (1992-09-01), Suzuki
patent: 5177599 (1993-01-01), Takagi et al.
patent: 5264921 (1993-11-01), Jinnai
patent: 5267026 (1993-11-01), Kawahara et al.
patent: 5272521 (1993-12-01), Tatsumi
patent: 5274440 (1993-12-01), Miyazaki
Matsui Seiichi
Nakane Yoshio
Saito Kenji
Fuji Photo Film Co. , Ltd.
Miller John W.
Powell Mark R.
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