Automatic white balance circuit capable of effectively adjusting

Details Automatic white balance circuit capable of effectively adjusting Automatic white balance circuit capable of effectively adjusting

1989-08-01

1991-04-23

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 41, H04N 973 C

Patent

active

050103946

ABSTRACT:
A holding circuit holds and outputs an output value of ratio signal generating means corresponding to the maximum value of illuminance of light which is emitted from a light source. A flashing light source detecting circuit detects the number of flashing times of the light source, to output a first signal when the number of flashing times exceeds a prescribed number, while outputting a second signal when the former is less than the latter. A switch circuit outputs an output of the holding circuit in response to the first signal from the flashing light source detecting circuit, while outputting an output of the ratio signal generating means in response to the second signal. A white balance adjusting circuit performs white balance adjustment in accordance with an output from the switch circuit. Thus, when the light source is a flashing one which flashes over the prescribed number of times, no white balance adjustment is performed on the basis of a signal in an OFF state of the light source.

REFERENCES:
patent: 4422743 (1983-12-01), Izumi et al.
patent: 4584598 (1986-04-01), Kutaragi
patent: 4847680 (1989-07-01), Okino
patent: 4879600 (1989-11-01), Ise et al.

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