Automatic focusing system and method thereof

Details Automatic focusing system and method thereof Automatic focusing system and method thereof

2008-03-26

2010-06-01

Perkey, W. B. (Department: 2862)

Photography

With exposure objective focusing means, focusing aid, or...

Ambient light compensating

C348S353000, C348S226100, C250S201700

Reexamination Certificate

active

07729604

ABSTRACT:
An exemplary automatic focusing system adopted in a camera includes a brightness detecting unit, a recording unit, a correcting unit, and a selecting unit. The brightness detecting unit is configured for detecting a general brightness value of an environment of a subject prior to a focusing operation of the camera and outputting a correction factor associated with the general brightness value. The recording unit is configured for storing a first set of brightness values and the first set of contrast values. The correcting unit stores a preset brightness value and a preset contrast value. The correcting unit is configured for calculating a number of second contrast values according to the correction factor, the first set of brightness values, a preset brightness value, and a preset contrast value. The selecting unit is configured for choosing a maximum contrast value from the number of second contrast values of the subject.

REFERENCES:
patent: 6373525 (2002-04-01), Nishiyama
patent: 6989860 (2006-01-01), Hofer et al.
patent: 2003/0090587 (2003-05-01), Hofer et al.
patent: 2004/0016919 (2004-01-01), Daiku et al.

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