Product edge defect detection method

一种边缘缺陷、检测方法的技术，应用在图像数据处理、仪器、字符和模式识别等方向，能够解决边缘缺陷检测算法研究通用性不强、不适用拉伸型边缘检测等问题，达到计算速度快、检测精度高的效果

Active Publication Date: 2021-02-05
CASI VISION TECH (BEIJING) CO LTD +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

The research on edge defect detection algorithms at home and abroad is not very versatile. One type of algorithm uses straight line fitting to compare the distance from the edge point to the fitted line to detect edge defects in straight line areas; the other type of algorithm uses open and close operations to compare The change of the area detects the edge defects of the complete area with smooth edges; there is another type of algorithm that uses template matching to compare the similarities and differences between the test and the template to detect the edge defects of the target image
[0007] However, the above methods are not suitable for defect detection of stretched edges

Method used

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Embodiment Construction

[0051] The present invention is described in detail below in conjunction with embodiment. In order to make the purpose, technical solutions and advantages of the present invention clearer and clearer, the present invention will be further described in detail below, but the present invention is not limited to these examples.

[0052] The invention provides a fast stretch-resistant edge defect detection method based on template matching. This method is based on image edge information, by obtaining the edge information of the template small image to make an edge information template, using coordinate transformation to determine the ROI of the target image area to be inspected to obtain the small image to be inspected, and making different downsampling scales by obtaining the edge information of the small image to be tested. Measure the edge information, obtain the affine transformation parameters according to the rough matching of the minimum circumscribed rectangle features of t...

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Abstract

The invention discloses a product edge defect detection method. The method comprises the following steps: step 1, carrying out image input; step 2, carrying out image preprocessing; step 3, carrying out template rough matching; step 4, segmenting edge information to be measured; step 5, creating a template data structure; step 6, down-sampling the edge information to be measured; step 7, carryingout matching in the template; step 8, calculating affine transformation parameters; step 9, carrying out template fine matching; and step 10, carrying out edge defect detection. According to the method, the edge information of the image is binarized, so that the method has the advantages of being insensitive to illumination change and edge gray scale and being stable and reliable; the edge information downsampling is utilized to iterate template matching parameters from coarse to fine, so that the method has the advantage of high calculation speed; the RANSAC principle and the fine matching mode of parameter iterative optimization are utilized, so that the method has the advantage of high detection precision; and a segmented matching template matching mode is adopted, so that the advantageof stretching resistance is achieved.

Description

technical field [0001] The invention relates to a defect detection method for cover plates and plate products, in particular to a rapid stretch-resistant edge defect detection method. Background technique [0002] Industrial products often contain edges of various shapes, such as edges of circles, rectangles, and combinations of straight lines and arcs. Edge is an important feature of industrial products, which directly affects the quality of industrial products, and the defects on the edge of general products are mostly serious defects of products, such as bud missing, sawtooth, chipping and other defects directly lead to product scrapping. Product edge defect detection is an important step to ensure product quality. [0003] Edge defect detection mainly detects the consistency of the edge of industrial products, that is, detects whether there are defects such as convex marks and dents on the edge of industrial products. Specifically, for example, the edge defect detectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/13G06T3/00G06K9/62
CPCG06T7/0004G06T7/13G06T2207/30108G06V10/751G06T3/02
Inventor 胡昌欣
Owner CASI VISION TECH (BEIJING) CO LTD
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