Automatic white balance adjusting circuit for image pickup devic

Details Automatic white balance adjusting circuit for image pickup devic Automatic white balance adjusting circuit for image pickup devic

1986-03-31

1987-07-21

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 973

Patent

active

046822100

ABSTRACT:
An automatic white balance adjusting circuit comprises a color temperature detecting circuit for producing a detection signal having a voltage in correspondence with a color temperature of an incoming light to an image pickup device, a reference voltage signal generating circuit for generating an A.C. reference voltage signal, a comparing circuit for obtaining a discrimination signal by comparing the detection signal with the reference voltage signal, a plurality of voltage sources for applying different voltages in correspondence with different color temperatures, a selecting circuit for selecting and obtaining voltages from the voltage sources depending on the output discrimination signal of the comparing circuit, and an integrating circuit for integrating output voltage signals of the selecting circuit. Output voltage signals of the integrating circuit are applied to corresponding amplifiers to variably control amplifications thereof so that a white balance of a color video signal produced from an encoder is automatically adjusted.

REFERENCES:
patent: 4584598 (1986-04-01), Kutaragi
patent: 4605955 (1986-08-01), Hashimoto
patent: 4616253 (1986-10-01), Hashimoto

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