light metering device with detector matrix and mean value detect

Details light metering device with detector matrix and mean value detect light metering device with detector matrix and mean value detect

1989-02-24

1990-05-29

Nelms, David C.

Boots, shoes, and leggings

250214P, 2502081, 2502083, 356222, 354432, H01J 4014

Patent

active

049298240

ABSTRACT:
A light metering device includes a light detecting number having a plurality of light detecting elements arranged in a matrix for detecting brightness of smaller divisions into which a whole image field is divided, respectively, to define a plurality of light metering areas different in area in an image field so as to contain a smaller light metering area within a larger light metering area, and a calculating member for obtaining a mean brightness value of each light metering area by calculating an arithmetic mean value of the outputs from the light detecting elements defining each light metering area. The difference of mean brightness values of two adjacent light metering areas is compared with a predetermined critical mean brightness value to determine that lighting condition under which a subject exists is ordinary or unusual.

REFERENCES:
patent: 4445778 (1984-05-01), Nakauchi
patent: 4476383 (1984-10-01), Fukuhara et al.

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