White balance controlling device having a device for determining

Details White balance controlling device having a device for determining White balance controlling device having a device for determining

1989-04-25

1992-03-24

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9535

Patent

active

050993135

ABSTRACT:
A white balance control device used in an electronic image forming device having a color image sensor for providing color image signals includes a color balance correcting circuit that is provided to detect a color temperature of the light based on an output from a visible light sensor and to provide a correction signal according to the determined color temperature. Thereby the image signals may be corrected in white balance. The color balance correcting circuit may be operated in a fluorescent light mode or a natural light mode. A light source determining circuit cooperates with the color balance correcting circuit to determine whether the light source is a fluorescent light source in response to an output from an infrared light sensor and an actuating signal is provided that causes the white balance correcting circuit to operate in the fluorescent light mode when the light source is a fluorescent light source.

REFERENCES:
patent: 4584598 (1986-04-01), Kutargi
Jay, Frank "IEEE Standard Dictionary of Electrical and Electronics Terms" 1984, p. 1003.

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