Photometry system

Details Photometry system Photometry system

1996-09-17

1998-04-21

Perkey, W. B.

Photography

Exposure control circuit

Having log transformation circuit

396234, G03B 708

Patent

active

057428522

ABSTRACT:
A photometric system is provided in which the value is obtained when the center-weighted photometric value and the like are determined from a plurality of separate photometric outputs is the same value that is obtained when photometry is accomplished on the same area when it is treated as a single cell. The photometric system includes a photometric element which divides the subject field into regions in order to measure the light quantity, a photometric mode selection unit which selects a photometric mode, a plurality of addition units which add together certain outputs from the outputs of the photometric element 11 in accordance with the selection made by a photometric mode selection switch, and a logarithm conversion unit which converts the output of the plurality of addition units into logarithms.

REFERENCES:
patent: 5450163 (1995-09-01), Iwasaki
patent: 5521673 (1996-05-01), Iwasaki

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