Method and apparatus for controlling exposure of camera

Details Method and apparatus for controlling exposure of camera Method and apparatus for controlling exposure of camera

1995-06-07

1997-10-14

Metjahic, Safet

Photography

Exposure control circuit

Having plural photocells

G03B 708

Patent

active

056780982

ABSTRACT:
An exposure control method and apparatus for a camera having a two-area divided brightness measurement system. A central light value is determined based on a central area brightness of a photographic scene, and a peripheral light value is determined based on a peripheral area brightness of the scene. After determining by comparison between the central and peripheral light values whether the scene is back-lighted or front-lighted, a correction coefficient specific to back-lighted scenes or that specific to front-lighted scenes is read from a memory. An exposure value suitable for a main subject is calculated according to the following equation:

REFERENCES:
patent: 4530585 (1985-07-01), Kanai
patent: 4547663 (1985-10-01), Kitagishi et al.
patent: 4937611 (1990-06-01), Miyazaki
patent: 5023649 (1991-06-01), Hayashi et al.
patent: 5115269 (1992-05-01), Masanga et al.
patent: 5319416 (1994-06-01), Takagi
patent: 5351309 (1994-09-01), Lee et al.
Norman Goldberg, Camera Technology The Dark Side of the Lens, Academic Press, pp. 57 and 58 1992.

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