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A method for measuring the size of screen printing templates based on machine vision

A technology of screen printing and measurement method, which is applied in measurement devices, instruments, image analysis and other directions, can solve the problem of difficulty in efficiently and accurately measuring the size of screen printing samples, and achieves improved efficiency and accuracy, accuracy and stability. , the effect of improving flexibility

Active Publication Date: 2021-04-06
YANSHAN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] To sum up, the traditional visual inspection method has the disadvantage of being difficult to efficiently and accurately measure the size of the screen printing template

Method used

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  • A method for measuring the size of screen printing templates based on machine vision
  • A method for measuring the size of screen printing templates based on machine vision
  • A method for measuring the size of screen printing templates based on machine vision

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Embodiment Construction

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments.

[0039] A kind of screen printing sample size measuring method based on machine vision of the present invention, such as figure 1 shown, including the following steps:

[0040] Step S1: collecting the image of the screen printing sample to be detected;

[0041] Use the charge-coupled device CCD camera to collect the image of the screen printing sample, and use the combination of red backlight and red dome shadowless light source to irradiate the screen printing sample, so that the image is clear and the contour contrast of each measurement point is ...

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Abstract

The invention discloses a method for measuring the size of a screen printing template based on machine vision, which solves the problems of low efficiency and difficulty in improving the precision of the traditional measurement method. The present invention adopts a coarse-to-fine measurement strategy, performs information statistics by means of templates of each type of target to be measured, sets threshold parameters pertinently, and improves measurement accuracy. In the template creation stage, the target to be measured is selected using the rotatable and zoomable ROI rectangular frame, and the center of mass coordinates and rotation angle of the ROI are used to adjust the template to be consistent with the direction of the image coordinate system to create a template for generating the target to be measured; in the measurement stage, Using the hierarchical matching algorithm based on the combination of image pyramid and normalized cross-correlation function to realize the rough positioning of multiple targets to be measured, and then use the threshold parameters obtained from the statistics of the template information to perform fine positioning of the edges, establish a local measurement coordinate system, and complete Measurement. The invention has the advantages of fast operation speed, high matching precision, accurate measurement result, wide applicability and the like.

Description

technical field [0001] The invention relates to a measurement method in the fields of computer vision and industrial image processing, in particular to a method for measuring the size of a screen printing template based on machine vision. Background technique [0002] In various fields of modern industrial production, screen printing technology plays an important role. Screen printing means that the screen is used as the plate base, and the screen printing plate with graphics and text is made through the photosensitive plate making method. The screen printing plate is composed of five elements, the screen printing template, the scraper, the ink, the printing table and the substrate. Among them, whether the size of the screen printing template is appropriate directly affects the quality of the screen printing pattern. Therefore, it is an urgent problem to be solved to realize the rapid and high-precision measurement of the size of the screen printing template. [0003] For ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T7/13G06T7/136G06T7/62G01B11/00
CPCG01B11/00G06T7/001G06T2207/10004G06T2207/30144G06T7/13G06T7/136G06T7/62
Inventor 刘斌董正天李沛航高明坤
Owner YANSHAN UNIV
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