Photography – Flash system responsive to focal length or distance
Reexamination Certificate
2007-08-07
2007-08-07
Perkey, W. B. (Department: 2851)
Photography
Flash system responsive to focal length or distance
C396S157000
Reexamination Certificate
active
11085875
ABSTRACT:
An image capturing apparatus in which the ratio between the brightness just before preliminary light emission and the brightness at preliminary light emission is calculated for each of a plurality of photometric areas. The highest ratio among the ratios in the areas is extracted as a reference value, the extracted reference value is compared with the ratio in each area, and a weighting coefficient in each area is calculated. By using the obtained weighting coefficient, the amount of light to be emitted for obtaining correct exposure is calculated.
REFERENCES:
patent: 5309193 (1994-05-01), Takagi
patent: 6349175 (2002-02-01), Tokunaga
patent: 6928239 (2005-08-01), Fukui
Canon Kabushiki Kaisha
Canon U.S.A. Inc. I.P. Div
Perkey W. B.
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