Steel plate surface defect image extraction method

An extraction method and surface image technology, applied in image enhancement, image analysis, image data processing, etc., can solve problems such as low contrast, unclear edges, and reduced efficiency and accuracy of defect areas, so as to weaken the influence of noise and avoid errors Extractable, easy-to-handle effects for real-time processing

Inactive Publication Date: 2017-05-31
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

[0007] In the extraction process, there will be the following problems, such as the influence of the lighting environment and the difference in the light absorption and reflection of the steel plate itself, resulting in uneven illumination of some steel plate images, loss of some useful information, low contrast between the front and back, and increasing the difficulty of defect target extraction. ; or the collected image is easily affected by the background environment, such as noise, texture and other factors, the image quality is low, the edge is not clear, and the target area is difficult to extract; moreover, there are many types of defects, different shapes, different degrees of severity, The contrast between the foreground and background of some defect images is still low after image enhancement, these factors increase the difficulty of defect extraction
These problems seriously reduce the efficiency and accuracy of defect area extraction, which affects subsequent defect identification

Method used

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  • Steel plate surface defect image extraction method
  • Steel plate surface defect image extraction method
  • Steel plate surface defect image extraction method

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Embodiment

[0093] Such as Figure 5 Shown is the original defect image preprocessed by the present invention, wherein, (a) scratches; (b) pressed dirt; (c) holes; (d) black spots; (e) pinholes; (f) scratches mark. The defect image extracted by the extraction method of the present invention is as follows: Image 6 As shown, among them, (a) scratches; (b) press-in dirt; (c) holes; (d) black spots; (e) pinholes; (f) scratches.

[0094] Specifically, take the use of pressed-in dirt defects as an example (such as Figure 7 shown), the parameter settings are selected as follows: in step S11, the number of blocks is 8×8, that is, n is 8; the area occupied by each defect generally does not exceed 20% of the steel plate image area, so m is selected as 12; step S22 Among them, β is that scale factor is selected 0.6; In step S31, the single DoG filter number N is 4, and β=0.065 among the step S35; N 1 = 3; kappa = 0.15. pass Figure 7 It can be seen that the use of the extraction method of th...

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Abstract

The invention provides a steel plate surface defect image extraction method. The method is characterized by including the following steps that steel plate surface images are subjected to ROI detection, and non-defect images are removed; defect images are sequentially read, the images are preprocessed, the influences of noise and non-uniform illumination on the defect segmentation effect are removed, and the foreground and background contrast ratio is increased; the preprocessed steel plate defect images are subjected to defect region segmentation extraction through Center-Surround Difference, and finally data is output. The efficiency of an image extraction algorithm is improved, it is not needed to occupy large memory space, real-time processing is convenient, the influence of the noise is effectively weakened, wrong extraction, caused by illumination and brightness unevenness, of the images is avoided, the contrast ratio is increased, the defect extraction effect is more excellent, and details are complete.

Description

technical field [0001] The invention relates to the technical fields of machine vision and non-destructive testing, in particular to a method for extracting a defect image on a steel plate surface under the interference of various defects. Background technique [0002] Steel products are widely used in construction, home appliances, vehicles and ships, container manufacturing, electromechanical industry, etc., almost involving all fields of clothing, food, housing and transportation. During the production and processing of steel plates, they are easily affected by many factors such as raw materials, rolling equipment, and workers' operating techniques, resulting in various defects such as holes, scratches, inclusions, scratches, and stamping. The existence of these defects not only affects the appearance of the steel plate, but also affects its corrosion resistance, wear resistance and fatigue strength, and seriously reduces the quality of the steel plate. Therefore, how to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/11G06T7/136G06T7/13
CPCG06T7/0004G06T2207/10004G06T2207/20104G06T2207/30136
Inventor 王演房敏
Owner DALIAN MARITIME UNIVERSITY
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