Method of and apparatus for automatically controlling exposure

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

1991-10-02

1993-02-02

Perkey, W. B.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

354446, 358228, 356222, 250214P, 2502081, G03B 708, G03B 7095, H04N 5238, G01J 142

Patent

active

051841720

ABSTRACT:
In an automatic exposure (AE) controlling method and apparatus according to the invention, a picturing area or a view is divided into a plurality of zones of which the central one is usually used for iris adjustment with the largest weight. The central zone is automatically expanded or reduced in the upper, lower, right-hand or left-hand direction(s) in accordance with differences in average luminance between the central zone and a respective one of the surrounding zones.

REFERENCES:
patent: 4364650 (1982-12-01), Terashita et al.
patent: 4445778 (1984-05-01), Nakauchi
patent: 4534639 (1985-08-01), Konishi et al.
patent: 4855780 (1989-08-01), Hayakawa
patent: 4912495 (1990-03-01), Ishikawa
patent: 4929824 (1990-05-01), Miyazaki
patent: 4978990 (1990-12-01), Yamasaki et al.

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