Quartz rod bubble detection and quality grading method based on machine vision

A technology of machine vision and detection method, which is applied in the direction of instruments, analysis materials, image analysis, etc., can solve the problems of high cost of manual detection, high misjudgment rate, and restrictions on the development of quartz rod manufacturing industry, etc., and achieve strong anti-environmental light interference ability , the effect of unified testing standards

Inactive Publication Date: 2017-08-22
WUHAN UNIV OF TECH
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Problems solved by technology

[0002] At present, there are many kinds of detection methods for quartz rod products. The commonly used methods are manual detection, laser detection, and Moore's interferenc

Method used

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  • Quartz rod bubble detection and quality grading method based on machine vision
  • Quartz rod bubble detection and quality grading method based on machine vision
  • Quartz rod bubble detection and quality grading method based on machine vision

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Embodiment Construction

[0031] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings.

[0032] Step 1, collect the grayscale image of the cross-section of the quartz rod.

[0033] Soak the quartz rod in the medium liquid, the refractive index of the medium liquid is close to that of the quartz rod, and the viscosity is low. The quartz rod is placed in a dark room, the laser beam emitted by the laser light source illuminates the quartz rod from one side, and the industrial camera photographs the quartz rod to obtain a grayscale image of the cross-section of the quartz rod.

[0034] Step 2, denoising, thresholding, and binarizing the grayscale image in sequence to obtain a binary image.

[0035] In this step, the balanced threshold segmentation method is used for threshold segmentation, specifically:

[0036] For the grayscale image, the threshold is determined by the maximum inter-class variance threshold selection ...

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Abstract

The invention discloses a quartz rod bubble detection and quality grading method based on machine vision. The method comprises the following steps: S1. a quartz rod is placed in a darkroom, a laser beam is irradiated from one side to the quartz rod, and an industrial camera is used for shooting a grey-scale image of a quartz rod cross section; S2. noise removing, threshold segmentation, and binaryzation of the grey-scale image are carried out in order, and a binary image is obtained; S3. a connected domain of the binary image is labeled by a course-based connected domain labeling method, and the labeled connected domain is a bubble; S4. characteristics of the bubble are extracted from the connected domain, and quality of the quartz rod is graded according to the characteristics of the bubble. Bubbles in the quartz rod can be detected based on image processing techniques, detection standard is unified, capability for resisting interference of ambient light is high, and bubbles in the quartz rod can be rapidly and accurately detected.

Description

technical field [0001] The invention relates to a method for automatic detection of bubbles in quartz rods, in particular to a method for detection and quality classification of quartz rod bubbles based on machine vision. Background technique [0002] At present, there are many kinds of detection methods for quartz rod products. The commonly used methods are manual detection, laser detection, and Moore's interference law detection. Failure to meet the real-time requirements of the system under working conditions also limits the development of the quartz rod manufacturing industry. Contents of the invention [0003] The object of the present invention is to provide a method for detecting and classifying air bubbles in quartz rods based on machine vision. [0004] To achieve the above object, the present invention adopts the following technical solutions: [0005] One, a kind of quartz rod air bubble detection method based on machine vision, comprising: [0006] The S1 qu...

Claims

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Application Information

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IPC IPC(8): G01N21/88G01N21/01G06T7/11G06T7/66G06T7/136G06T7/187
Inventor 撒继铭施柳龚洋珉许佳辉
Owner WUHAN UNIV OF TECH
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