Title:
IMAGING DEVICE AND FOCUS CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2020/059424
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide technology for reducing false focusing of contrast AF. One representative imaging device of the present invention comprises: an imaging unit that generates a video signal by capturing a subject image formed through an optical system; a band correction unit that reduces a low-frequency component from the video signal and generates a video signal for AF detection; an AF detection unit that finds a contrast evaluation value CT from the video signal for AF detection; and a focus control unit that controls a focusing position of the optical system in the direction in which the contrast evaluation value CT increases. The low-frequency component is preferably a component in a spatial frequency band of signal unevenness caused by low contrast, such as fog or mist, for example.
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Inventors:
KOGO KIYOTAKA (JP)
Application Number:
PCT/JP2019/033060
Publication Date:
March 26, 2020
Filing Date:
August 23, 2019
Export Citation:
Assignee:
HITACHI INT ELECTRIC INC (JP)
International Classes:
G02B7/36; G03B13/36; H04N5/232
Foreign References:
| JP2007310143A | 2007-11-29 | |||
| JP2003322789A | 2003-11-14 |
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