Method and apparatus for exposure control based on color balance

Details Method and apparatus for exposure control based on color balance Method and apparatus for exposure control based on color balance

1988-12-12

1989-12-12

Perkey, W. B.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

354432, 354443, 354482, 358 29, 358228, G03B 708, G03B 7097, G03B 7099, H04N 964

Patent

active

048871214

ABSTRACT:
A method and apparatus for exposure control in a camera is disclosed in which color balance information is used to select a weighted exposure measurement. A color balance signal is generated by measuring either light directly illuminating the camera or scene light passing through the lens system of the camera. The color balance signal is used to address a liquid crystal mask that selectively transmits a portion of the scene light to a group of photodetectors for a weighted exposure measurement.

REFERENCES:
patent: 3232192 (1966-02-01), Stimson
patent: 3955208 (1976-05-01), Wick et al.
patent: 4366499 (1982-12-01), Mir
patent: 4491390 (1985-01-01), Tong-Shen
patent: 4545672 (1985-10-01), Ozawa
patent: 4561731 (1985-12-01), Kley
patent: 4774564 (1988-09-01), Konishi

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