Method and apparatus for determining focusing position

Details Method and apparatus for determining focusing position Method and apparatus for determining focusing position

2007-02-09

2009-10-27

Ho, Tuan V (Department: 2622)

Television

Camera, system and detail

Optics

C348S356000

Reexamination Certificate

active

07609319

ABSTRACT:
A photography device has an AF mechanism including: a CCD; an analog signal processing section; an image input controller; an AF processing section; a CPU; and a focusing lens driving section. The AF mechanism operates to focus an imaging lens on a subject. If an image represented by output from the CCD does not include a specific low contrast subject, image data representing the image is passed through a first high frequency filter that transmits components having frequencies greater than or equal to a first cutoff frequency, and a focus evaluation value is determined based on the transmitted components. If the image includes the specific subject, the image data is passed through a second high frequency filter that transmits components having frequencies greater than or equal to a second cutoff frequency, lower than the first cutoff frequency, and a focus evaluation value is determined based on the transmitted components.

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