Scene brightness measuring system

Details Scene brightness measuring system Scene brightness measuring system

1981-05-04

1983-07-26

Gellner, Michael L.

G03B 7097, G03B 7099

Patent

active

043950990

ABSTRACT:
A number of light receiving elements are used for measuring the brightness Bi of a number of parts of the scene and the maximum brightness Bmax and the minimum brightness Bmin are detected among the measured brightness values. Then, the scene brightness B is calculated by use of a formula: ##EQU1## Based on the scene brightness thus obtained, the aperture or shutter is controlled to obtain appropriate exposure. In case where the weighting coefficients for the number of light receiving elements are made equal to each other, the average brightness Bmean throughout the whole image is used.

REFERENCES:
patent: 3772517 (1973-11-01), Smith
patent: 4085320 (1978-04-01), Wilwerding
patent: 4183645 (1980-01-01), Ohmura et al.
patent: 4214826 (1980-07-01), Uchida et al.
patent: 4306787 (1981-12-01), Fukuhara et al.

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