Auto focus apparatus and method for camera

Details Auto focus apparatus and method for camera Auto focus apparatus and method for camera

2008-05-20

2011-11-15

Laballe, Clayton E (Department: 2862)

Photography

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

Processing circuit

C396S093000, C396S133000, C348S356000

Reexamination Certificate

active

08059956

ABSTRACT:
An auto focus (AF) apparatus and method for a camera that improves the AF action by reducing the number of time and steps required of a conventional apparatus and method. An encoder initial value is detected by measuring an initial position of a lens unit by means of an encoder; matching the measured encoder initial value to an initial position value to which the lens unit is to move while performing the auto focus; performing the auto focus starting from the matched initial position value, and dividing a distance that the lens unit is to cover into sections corresponding to a preset number of steps; detecting an edge value which shows a brightness change for a contour of a subject for as many as the number of the preset steps. The AF is completed by moving the lens unit to a position corresponding to a maximum edge value selected from among the detected edge values.

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