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

1997-04-04

1998-06-30

Perkey, W. B.

Photography

Flash system responsive to focal length or distance

396161, 396187, G03B 1505

Patent

active

057747474

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: 4288153 (1981-09-01), Johnson
patent: 4963915 (1990-10-01), Ikemura et al.
patent: 4969005 (1990-11-01), Tokunaga
patent: 5311244 (1994-05-01), Nakai et al.

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