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Automatic focusing method of optical imaging system

An optical imaging system and automatic focusing technology, which is applied to parts of TV systems, image communication, color TV parts, etc., can solve problems such as low precision, poor repeatability, complex design of mechanism and control circuit, etc. Short focusing time, easy to change the effect

Inactive Publication Date: 2010-06-09
河南平原光电有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is that the design of traditional autofocus mechanism and control circuit is complicated, the precision is low, and the repeatability is poor.

Method used

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  • Automatic focusing method of optical imaging system
  • Automatic focusing method of optical imaging system
  • Automatic focusing method of optical imaging system

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Embodiment Construction

[0033] Such as figure 1 As shown, the depth of focus method (DFF, Depth From Focus) collects a series of digital images through a computer (or a dedicated circuit system), and processes each frame of the image to determine whether the focus is accurate, that is, whether the image is clear. And give a feedback signal to control the movement of the lens until the captured image reaches the clearest, and finally the focus is completed.

[0034] Such as figure 2 As shown, the entire focusing system can be divided into three modules: One is the imaging system, which is an optical coupling element CCD camera plus a variable lens. The image capture card completes the analog-to-digital conversion of the video signal and collects it into the computer. The second component is the drive interface circuit between the digital imaging system and the PC computer. This circuit is responsible for translating the control level signal input from the computer into a logic level signal that the imag...

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Abstract

The invention discloses an automatic focusing method of an optical imaging system. The method uses a set of digital imaging system comprising a CCD, an image collecting card, a zoom lens and a calculation display system. The method comprises: subjecting the image collected by the CCD to digitization treatment through the image collecting card; selecting a reasonable focusing window and subjecting the image to a pre-treatment stage; using software to program for coarsely focusing through selecting reasonable focusing criterion and using a focusing depth method, and finely focusing until an optimal focal plane is found out; and sending a control command to a singlechip through a program, driving a motor of the zoom lens to drive the lens to an optimal plane position for imaging, and displaying an optimal focal plane image through the window. During the coarse focusing, the step pitch of the selected control motor is large so as to reduce focusing time, and during the fine focusing, the step pitch of the selected control motor is small so as to reasonably control the error of the system.

Description

Technical field [0001] The invention relates to an automatic focusing method of an optical imaging system. Background technique [0002] Automatic focusing is to use modern electronic technology and mechanical control methods to replace the human eye to detect whether the focus of the subject is clear or not, and replace the human to manually adjust the focus, so that the object can be clearly imaged on the image surface. [0003] The traditional automatic focusing methods are: [0004] (1) Ranging method: Including laser ranging, infrared ranging and ultrasonic ranging, all of which reach the distance and orientation of the measurement target by receiving reflected waves, and then automatically adjust the focus through a computer. [0005] (2) Focus detection method: It uses two symmetrical optical lenses to compare the focusing degree of the subject. Only when the focus is clear, the imaging of the two optical lenses can be consistent. [0006] The mechanism and control circuit of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232
Inventor 申志芳何波吴应运辛玫王曦郭海松王喜宝
Owner 河南平原光电有限公司
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