Auto-focus apparatus. image-capture apparatus, and...

Details Auto-focus apparatus. image-capture apparatus, and... Auto-focus apparatus. image-capture apparatus, and...

2007-06-28

2009-11-17

Koval, Melissa J (Department: 2862)

Photography

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

Processing circuit

C348S345000, C348S086000, C348S086000

Reexamination Certificate

active

07620311

ABSTRACT:
An auto-focus apparatus including an evaluation value calculator periodically calculating evaluation values using high frequency components of image signals in a specific region of a subject image, a distance measurement unit measuring a distance to a subject and output a distance measurement result, a control unit outputting instruction values based on the evaluation values and determining whether a subject image is in-focus or out-of-focus, and a storage storing the distance measurement results and lens positions. In the apparatus, after searching the peak of the evaluation values, the control unit returns the lens to the position at which the relative maximum has been detected, obtains evaluation values, stores lens positions and distance measurement results when the evaluation values satisfy a prescribed condition, and retrieves distance measurement results and lens positions when the number of times that results are stored reaches a prescribed number, and computes a correction amount.

REFERENCES:
patent: 2005/0099523 (2005-05-01), Konishi et al.
patent: 2008/0012977 (2008-01-01), Ito et al.
patent: 2005-92085 (2005-04-01), None
patent: 2006-301032 (2006-11-01), None

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