White balance control based upon magnitude of flicker

Details White balance control based upon magnitude of flicker White balance control based upon magnitude of flicker

1993-02-08

1993-10-19

Powell, Mark R.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 973

Patent

active

052550770

ABSTRACT:
Method and apparatus for effecting white balance control in which an image pickup apparatus converts image light into an electrical signal using an image pickup element, and outputs a plurality of color signals corresponding to received light. A still image recorder records the color signals as a still image, and a controller effects a first exposure with the image pickup element before still image recording. Then, the controller forms a white balance control signal by using the first image pickup signals output from the image pickup element in the first exposure. Thereafter, the controller conducts a second exposure to obtained second image pickup signals, and effects white balance control of the second image pickup signals based on the white balance control signals. White balance control is preferably effected by selectively using at least one of (a) information comprising red and blue signals among the outputs from the image pickup element, and (b) information comprising red, green and blue signals according to the amplitude of a detected flicker of the light source.

REFERENCES:
patent: 4638350 (1987-01-01), Kato et al.
patent: 4682210 (1987-07-01), Ikemura et al.
patent: 4689686 (1987-08-01), Hashimoto et al.
patent: 4727413 (1988-02-01), Miura et al.
patent: 4811086 (1989-03-01), Hieda
patent: 4879591 (1989-11-01), Takei
patent: 4918519 (1990-04-01), Suzuki et al.
patent: 5010393 (1991-04-01), Saito
Patent Abstracts of Japan, Publication No. 01227581.
Patent Abstracts of Japan, Publication No. 63179666.

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