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AOI character defect detection method and device based on industrial machine vision

A character and defect technology, which is applied in the field of AOI character defect detection based on industrial machine vision, can solve problems such as low recognition accuracy, limited photo quality requirements, and reduced product qualification rate, achieving the effect of accurate matching results

Active Publication Date: 2020-07-31
HOHAI UNIV CHANGZHOU
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, in industrial production, it is generally necessary to print certain character information on the product, and defects may appear when printing in a machine-operated environment, which will reduce the pass rate of the product during quality inspection and affect the progress of production
The traditional technology uses manual inspection of the character information printed on the product, which is slow, labor-intensive, and time-consuming
The detection method using machine vision is limited by the quality requirements of the photos taken, and the recognition accuracy is often low

Method used

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  • AOI character defect detection method and device based on industrial machine vision
  • AOI character defect detection method and device based on industrial machine vision
  • AOI character defect detection method and device based on industrial machine vision

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Embodiment 1

[0078] Based on the aforementioned inventive concept, this embodiment is a method for detecting AOI character defects, including:

[0079] Obtain the image to be detected;

[0080] Perform preprocessing on the image to be detected to obtain a region-of-interest image with corrected positions and characters;

[0081] Separating the image of the region of interest of the image to be detected to obtain the image of the character region;

[0082] Perform template matching on the character area image of the image to be detected and the pre-created reference image template to obtain the template matching result;

[0083] Judging whether there is a character defect in the image to be detected according to the template matching result;

[0084] The character defect judgment result is output.

[0085] In the method of the present invention, the pre-created reference image template is trained by using a plurality of character image samples containing characters to be detected, and th...

Embodiment 1-1

[0087] Based on Embodiment 1, this embodiment specifically introduces an AOI character defect detection method based on industrial machine vision.

[0088] The template matching of the present invention is based on the establishment of the reference image template and the position correction of the image to be detected and the selection of the character area. figure 1 As shown, before the actual detection is implemented, it is necessary to determine and acquire the reference image first, and determine the calibration points and mark points of the reference image. When detection is required, it is necessary to obtain the image to be detected first, pass its mark point, and then perform an affine transformation to make the image to be detected coincide with the mark point of the reference image to achieve position correction, and then crop the rectangular image area containing characters, such as figure 2 shown.

[0089] refer to Figure 4 As shown, in this embodiment, the im...

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Abstract

The invention discloses an AOI character defect detection method based on industrial machine vision. The AOI character defect detection method comprises the steps that a to-be-detected image is acquired; the to-be-detected image is preprocessed to obtain a character-containing region-of-interest image of which the position is corrected; the region-of-interest image of the to-be-detected image is separated to obtain a character region image; template matching is carried out on the character region image of the to-be-detected image and a pre-created reference image template to obtain a templatematching result; whether the to-be-detected image has character defects or not is judged according to the template matching result; and a character defect judgment result is outputted. According to the method, the defects of the ROI can be detected under the condition of a low-pixel grey-scale map through template matching, the detection efficiency and the accuracy are improved, and the detectionlabor cost is reduced.

Description

technical field [0001] The invention relates to the technical fields of image processing and machine vision, in particular to an AOI character defect detection method and device based on industrial machine vision. Background technique [0002] Machine vision is the use of machines instead of human eyes for measurement and judgment. It is easy to integrate information and is the basic technology for computer integrated manufacturing. The most basic feature of the machine vision system is to improve the flexibility and automation of production. In some dangerous working environments that are not suitable for manual work or where artificial vision is difficult to meet the requirements, machine vision is often used to replace artificial vision. At the same time, in the process of large-scale repetitive industrial production, the use of machine vision inspection methods can greatly improve the efficiency and automation of production. [0003] AOI (Automated Optical Inspection) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/956
CPCG01N21/956Y02P90/30
Inventor 徐宁朱怡刘小峰肖茹姚潇蒋爱民
Owner HOHAI UNIV CHANGZHOU
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