Title:
AUTOMATIC FOCUSING METHOD AND DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/200998
Kind Code:
A1
Abstract:
The present application relates to an automatic focusing method and device, wherein same fall within the technical field of electronics. The method comprises: controlling a lens group to move at a first speed, and photographing images at a pre-set photographing frequency during the process of the lens group moving at the first speed; when the definition of an image photographed in the state where the lens group moves at the first speed satisfies a pre-set condition, reducing the moving speed of the lens group to a second speed, and photographing images at the pre-set photographing frequency during the process of the lens group moving at the second speed; and when a first image with the highest definition is determined in the images photographed in the state where the lens group moves at the second speed, controlling the lens group to slow down, and when the lens group stops moving, controlling the lens group to return to a position of the lens group where the first image is photographed. A direct-current electric motor is controlled to drive a lens group in an electric camera lens with a large focal length to move, the time consumed in a moving process is relatively short, and automatic rapid focusing can be achieved.
Inventors:
XU LIMIN (CN)
Application Number:
PCT/CN2019/073433
Publication Date:
October 24, 2019
Filing Date:
January 28, 2019
Export Citation:
Assignee:
HANGZHOU HIKVISION DIGITAL TEC (CN)
International Classes:
H04N5/232
Foreign References:
| CN105391945A | 2016-03-09 | |||
| CN103513395A | 2014-01-15 | |||
| CN104301601A | 2015-01-21 | |||
| EP0630153A1 | 1994-12-21 |
Attorney, Agent or Firm:
PATENTSINO IP FIRM (CN)
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