Automatic focusing method, device and system

A technology of auto-focus and focus direction, which is applied in the focus device, installation, optics and other directions, can solve the problems of low focus precision and slow speed, and achieve the effect of high focus precision and fast speed

Active Publication Date: 2018-02-06
GUANGDONG SHUNDE IND DESIGN INST GUANGDONG SHUNDE INNOVATIVE DESIGN INST
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Based on this, it is necessary to provide an automatic focusing method, device and system for t

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  • Automatic focusing method, device and system
  • Automatic focusing method, device and system
  • Automatic focusing method, device and system

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Embodiment Construction

[0051] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. A preferred embodiment of the invention is shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0053] see f...

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Abstract

The invention relates to an automatic focusing method, a device and a system; the method comprises the following steps: obtaining an object imaging pre-estimated focusing area from out-of-focus imagesobtained by a camera under a preset object distance; calculating a coarse positioning gray value for each pixel point in the out-of-focus image, and obtaining a coarse positioning focusing evaluationfunction value corresponding to each out-of-focus image; respectively calculating a precise searching gray value of each pixel point in the out-of-focus image, thus obtaining a precise searching focusing evaluation function value corresponding to each out-of-focus image; obtaining an initial focusing direction according to each coarse positioning focusing evaluation function value; driving the camera to make global searches according to each precise searching focusing evaluation function value when the camera reaches the pre-estimated focusing area according to the initial focusing direction,thus obtaining the best focusing point for finishing the automatic focusing. The automatic focusing method, device and system are high in focusing precision, and fast in speed.

Description

technical field [0001] The present invention relates to the technical field of automatic focusing of imaging systems, in particular to an automatic focusing method, device and system. Background technique [0002] As the core function of the automatic control visual imaging system, autofocus technology is the key technology of the imaging system and the basis of high-precision visual measurement. According to the principle of autofocus, it can be divided into two categories: one is the distance measurement method, which is a focusing technology based on the measured distance to drive the motor to adjust the lens to the focus position; the other is the image method, which is to analyze the focus direction of the acquired image Then adjust the focal length to the best position for focusing technology. [0003] During the implementation process, the inventors found that there are at least the following problems in the traditional technology: [0004] The distance measurement ...

Claims

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Application Information

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IPC IPC(8): G03B13/36G02B7/36
CPCG02B7/36G03B13/36
Inventor 沈文斌吴本涛
Owner GUANGDONG SHUNDE IND DESIGN INST GUANGDONG SHUNDE INNOVATIVE DESIGN INST
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