Image pickup apparatus in which the white balance controller con

Details Image pickup apparatus in which the white balance controller con Image pickup apparatus in which the white balance controller con

1996-01-03

2000-08-22

Flynn, Nathan

Television

Camera, system and detail

Combined image signal generator and general image signal...

348655, H04N 973

Patent

active

061080373

ABSTRACT:
In controlling the gain of plural color signals, for the purpose controlling the white balance of a video signal released from an image pickup device and including the abovementioned plural color signals, there is provided a calculation circuit for calculating color temperature information according to the plural color signals and forming a gain control signal according to the color temperature information, and the variable range of the gain control signal is set at one of mutually nonoverlapping plural ranges, whereby the correction error of the white balance is rendered visually inconspicuous. Also in the calculation circuit, the plural color information are weighted according to the result of multiplication of plural coefficients which are variably set according to the mutually different plural hue components of the video signal, and the gain control signal is calculated according to thus weighted plural color information, whereby the white balance is stably controlled despite of the movement of object, variation in image frame or variation in color temperature.

REFERENCES:
patent: 4797733 (1989-01-01), Takagi et al.
patent: 4922330 (1990-05-01), Saito et al.
patent: 4998162 (1991-03-01), Kondo et al.
patent: 5223921 (1993-06-01), Haruki et al.
Patent Abstracts of Japan, vol. 17, No. 32 (E-1309) published Jan. 21, 1993, corresponding to Japanese Patent No. 4252588.
English abstract corresponding to Japanese Patent No. 2257786.

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