White balance adjusting device with plural thresholds for range

Details White balance adjusting device with plural thresholds for range White balance adjusting device with plural thresholds for range

1991-06-04

1994-02-01

Brinich, Stephen

Facsimile and static presentation processing

Natural color facsimile

Color separation

343655, H04N 973

Patent

active

052836355

ABSTRACT:
A white balance adjustment device includes an image sensor for converting light of an object into an electrical signal, an amplification circuit for amplifying the electrical signal output from the image sensor, a control voltage limiting circuit for limiting a range of a control voltage to be output to the amplification circuit, and a detection circuit for detecting a quantity of ambient light with a hysteresis characteristic. The limited range of the control voltage is arranged to be variable on the basis of an output of the detection circuit.

REFERENCES:
patent: 4574303 (1986-03-01), Hashimoto et al.
patent: 4595946 (1986-06-01), Uehara et al.
patent: 4616253 (1986-10-01), Hashimoto et al.
patent: 4638350 (1987-01-01), Kato et al.
patent: 4646161 (1987-02-01), Tsuchiya et al.
patent: 4682210 (1987-07-01), Ikemura et al.
patent: 4811086 (1989-03-01), Hieda
patent: 4833525 (1989-05-01), Suzuki et al.
patent: 5146316 (1992-09-01), Suzuki

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