Patent
1989-09-20
1990-08-21
Hix, L. T.
354410, 354421, G03B 1300
Patent
active
049510770
ABSTRACT:
Method and device for measuring the brightness of an object in photographing the object in flash synchronization by use of an AE sensor capable of averaged overall light reading. In the method and device, in accordance with the distance of the object and also with the focal distance of a taking lens, an area occupied by a main object or a ratio of the occupation area on the light receiving surface of the AE sensor is estimated. Then, in accordance with said estimated occupation area or occupation area ratio of the main object and also with a measurement brightness B.sub.V(AV) measured by the AE sensor, there is found a brightness correction value .DELTA.B.sub.V which provides a value that increases as the occupation area of the main object increases and the measurement brightness B.sub.V(AV) measured by the AE sensor increases. Further, the thus obtained brightness correction value .DELTA.B.sub.V is added to the measurement brightness B.sub.V(AV) by the AE sensor to thereby find an object brightness.
REFERENCES:
patent: 4285585 (1981-08-01), Numata
patent: 4724455 (1988-02-01), Suzuki et al.
Kaneko Koji
Mikajiri Satoshi
Ogata Kazutsugu
Seki Kazuhisa
Fuji Photo Film Co. , Ltd.
Gray David M.
Hix L. T,.
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