FOCUS CONTROLLER, IMAGING APPARATUS, AND FOCUS CONTROL METHOD

Title:

FOCUS CONTROLLER, IMAGING APPARATUS, AND FOCUS CONTROL METHOD

Document Type and Number:

Japanese Patent JP2007206606

Kind Code:

A

Abstract:

To provide technology of performing a focus control at high speed and with high accuracy even under illumination with flickering.

Before starting AF control, when a flicker frequency (for example, 50Hz or 60Hz) is detected, a frame rate is set to n-times (for example, 200fps or 240fps) as many as the flicker frequency L. Thereafter, by calculating a single AF evaluation value by using n/2 pieces (for example, two) of temporally continuously obtained image data, a plurality of AF evaluation values are calculated. The lens focal position of the focus lens 2a is detected on the basis of the plurality of AF evaluation values. By employing such the constitution, sampling of contrast AF control is performed in a cycle shorter than the flickering cycle.

Inventors:

FUJII SHINICHI

Application Number:

JP2006028249A

Publication Date:

August 16, 2007

Filing Date:

February 06, 2006

Export Citation:

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Assignee:

SONY CORP

International Classes:

G02B7/28; G02B7/34; G02B7/36; G03B13/36; H04N5/232

Domestic Patent References:

JPH11155094A	1999-06-08
JPH09284634A	1997-10-31
JPH0560611A	1993-03-12

Attorney, Agent or Firm:

Shigeaki Yoshida
Yoshitake Hidetoshi
Takahiro Arita

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