A multi-point automatic focusing method for linear array ccd cameras

An automatic focusing and camera technology, applied in the field of CCD imaging, can solve problems such as the problem that the scanned image quality of the entire PCB board cannot be fully explained, and achieve the effect of solving the failure of the ranging system or the inaccurate focusing, convenient implementation and simple mechanism.

Inactive Publication Date: 2016-04-27
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Focusing based on image processing technology adopts single-point adjustment, that is, select a specific area on the PCB to adjust the focal length to obtain the best image quality. Using this method to obtain image quality at each focal length cannot fully explain the entire block. PCB board scanning image quality problem

Method used

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  • A multi-point automatic focusing method for linear array ccd cameras
  • A multi-point automatic focusing method for linear array ccd cameras
  • A multi-point automatic focusing method for linear array ccd cameras

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] attached figure 1 Describes a linear array CCD camera multi-point automatic focusing system, the system includes the following components: linear array CCD camera, lens, image acquisition card, linear combined light source, motion control workbench, motion control card, motor focus micro Mechanism, vacuum adsorption device and computer control software, etc.

[0033] Wherein, the linear array CCD camera is used to collect the image of the PCB board in a specific area, and the collected image is stored in the image acquisition card;

[0034] The lens is placed before the linear array CCD camera, and is used in conjunction with the linear array CCD camera;

[0035] The linear combination light source produces the illumination light projected onto the PCB board;

[0036] The PCB board is vacuum-adsorbed on the motion control workbench; ...

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Abstract

The invention provides a multi-point automatic focusing method of a linear array CCD camera. The PCB board is divided into several areas, and the area to be scanned is selected; the linear array CCD camera is opened to collect images containing the outline information of the PCB board. The complexity of the information determines the image quality four-neighborhood definition weight coefficient of each region, and judges the best quality of the captured image according to the comprehensive definition of the image. The technical scheme provided by the invention is simple and practical, convenient to realize and strong in versatility. It can well solve the technical problem of the malfunction of the distance measuring system or the inaccurate focus, and the mechanism is simple and the precision is high.

Description

technical field [0001] The invention relates to a multi-point automatic focusing system and method for a linear array CCD camera, belonging to the technical field of CCD imaging. Background technique [0002] Linear array CCD is widely used because of its simple structure and low cost. The number of single-row photosensitive units of the linear array CCD can be made a lot. Under the premise of the same measurement accuracy, the measurement range can be made larger, and because the linear array CCD transmits the photoelectric conversion signal in real time and has a fast self-scanning speed and frequency response. High, can realize dynamic measurement, and can work under low illumination, so the linear array CCD is widely used in many fields such as product size measurement and classification, non-contact size measurement, bar code and so on. [0003] In the prior art, the current methods for obtaining the best image quality for scanning include: [0004] Ranging method: in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232G03B13/36G02B7/36
Inventor 程涛冯平彭小波徐刚孙高磊
Owner SHENZHEN UNIV
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