Automatic exposure control apparatus and method for electronic s

Details Automatic exposure control apparatus and method for electronic s Automatic exposure control apparatus and method for electronic s

1990-12-07

1992-05-19

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821319, H04N 5238, H04N 314, H04N 5335

Patent

active

051153190

ABSTRACT:
A pre-measurement of the subject brightness is performed with a preset aperture value and a preset shutter speed, and a main measurement is performed with a combination of an aperture value and a shutter speed that are determined based on the result of the pre-measurement in accordance with a program for the main measurement, wherein the aperture value is selected from among a relatively small number of predetermined aperture values. Thereafter, a combination of an aperture value and a shutter speed for photographing is determined based on the result of the main measurement in accordance with another program, wherein the aperture value is selected among a larger number of predetermined aperture values, so that the number of changing aperture value and thus the time lag are remarkably reduced while achieving an accurate exposure control.

REFERENCES:
patent: 4910600 (1990-03-01), Kondo
patent: 4984088 (1991-01-01), Tani et al.

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