Method of and apparatus for measuring scene brightness

Details Method of and apparatus for measuring scene brightness Method of and apparatus for measuring scene brightness

1980-12-22

1984-05-01

Arnold, Bruce Y.

Optics: measuring and testing

Photometers

Photoelectric

354432, 354412, 356221, G01J 144

Patent

active

044457782

ABSTRACT:
In a camera or a printer, exposure is controlled based on a selected mode of a light measuring system which has two modes of weighting the light measurement in for differently weighting various parts of an image of a scene according to whether the image is of a back light scene or a normal light scene. The light measuring means determines whether or not the difference in brightness between the central part and the marginal part of the image of a scene is smaller than a predetermined value. Pursuant to such determination, one of the modes of the light measuring system is selected, and the exposure is controlled by the output of the light measuring system in the selected mode.

REFERENCES:
patent: 3792484 (1974-02-01), Tsujimoto et al.
patent: 3850530 (1974-11-01), Uno et al.
patent: 4047187 (1977-09-01), Mashimo et al.
patent: 4075640 (1978-02-01), Ueda et al.
patent: 4104654 (1978-08-01), Maitana et al.
patent: 4182573 (1980-01-01), Yamada et al.
patent: 4339185 (1982-07-01), Nakauchi et al.

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