System and method of linear array CCD camera multi-point automatic focusing

An automatic focusing and camera technology, which is 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 can solve the failure of the ranging system or the inaccurate focusing, the technical solution is simple and practical, and the mechanism is simple. Effect

Inactive Publication Date: 2012-10-10
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
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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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  • System and method of linear array CCD camera multi-point automatic focusing
  • System and method of linear array CCD camera multi-point automatic focusing
  • System and method of linear array CCD camera multi-point automatic focusing

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] attached figure 1 A multi-point automatic focusing system of a linear array CCD camera is described, and the system includes the following components: a linear array CCD camera, a lens, an image acquisition card, a linear combination light source, a motion control workbench, a motion control card, and a motor focusing micro Mechanism, vacuum adsorption device and computer control software, etc.

[0034] 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;

[0035] The lens is placed before the linear array CCD camera, and is used in conjunction with the linear array CCD camera;

[0036] The linear combination light source produces the illumination light projected onto the PCB board;

[0037] The PCB board is vacuum-adsor...

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Abstract

The invention provides a system and a method of linear array CCD camera multi-point automatic focusing, wherein the method comprises dividing a PCB board into a plurality of areas, selecting an area needed to be scanned; opening a linear array CCD camera, collecting images containing contour information of the PCB board, determining image quality four-neighborhood definition weight coefficients of each area according to complexity levels of the contour information of different areas, and judging the optimal collecting image quality according to a comprehensive definition of the image. The technical solution provided by the invention is simple, practical, and convenient to implement, and has a strong versatility. The technical problem of malfunction or inaccurate focusing of a range-measurement system can be satisfactorily solved, and the mechanism is simple and highly accurate.

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 Applications(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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