Automatic optical filter displacing circuit

Details Automatic optical filter displacing circuit Automatic optical filter displacing circuit

1989-07-31

1991-05-14

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 973

Patent

active

050160915

ABSTRACT:
An automatic optical filter displacing circuit for optimizing the white balance of video cameras is disclosed which comprises a buffer means; a sample and holder means for producing average values of the buffered luminance signals and for carrying out a sampling out of the average values; a first reference signal supply means; a first comparing means; a second reference signal supply means; a second comparing means; an optical filter control means; a trigger means for generating a white balance setting signal automatically; and a power supply means. The optical filters are automatically displaced so as to achieve the optimum state of the white balance by making judgements on the color temperature condition and the light amount condition of the illumination, and the electrical corrections are decided optimally depending on the illuminating conditions, thereby producing a good image quality.

REFERENCES:
patent: 4249197 (1981-02-01), van Spaandonk et al.
patent: 4355325 (1982-10-01), Nakamura et al.

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