White balance controller for an image pick-up apparatus includin

Details White balance controller for an image pick-up apparatus includin White balance controller for an image pick-up apparatus includin

1991-07-17

1993-01-05

Coles, Sr., Edward L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 41, H04N 973

Patent

active

051775999

ABSTRACT:
A white balance controller for an image pickup apparatus having an image pickup for providing an output indicative of an image, a color separator responsive to the output of the image pickup for producing a luminance signal and a plurality of color signals therefrom, gain controllers for controlling a gain of at least two color signals of the plurality of color signals separated by the color separator, and a color difference signal generator for generating color difference signals from at least one of a color signal and luminance signal. The white balance controller includes white/achromatic detection for detecting at least one of a white and achromatic portion within an image picked up by the image pickup in accordance with a least the color difference signals, and an abnormality detector for detecting an abnormality of white balance within the picked up image. The abnormality detector supplies an output thereof to an input of the white/achromatic detector and enables control of a gain of the gain controllers in accordance therewith for enabling white adjustment.

REFERENCES:
patent: 4739393 (1988-04-01), Seki et al.
patent: 4750032 (1988-06-01), Nakayama
patent: 4883360 (1989-11-01), Kawada et al.

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