White balance correction device with correction signal limiting

Details White balance correction device with correction signal limiting White balance correction device with correction signal limiting

1992-09-03

1996-06-25

Groody, James J.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348655, H04N 973

Patent

active

055304745

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 above-mentioned 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 non-overlapping plural ranges, whereby the correction error of the white balance is rendered visually inconspicuous.

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.
European Search Report No. 92115060.3, communication dated Jun. 28, 1993, search completed Jun. 18, 1993.

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