Surface Defect Detection of Polyvinyl Chloride Pipes Based on Machine Vision

Shuhua Li; Yatong Zhou; Dan Wang; Jingfei He; Zhongwei Zhang

doi:10.3788/LOP56.131006

Laser & Optoelectronics Progress, Volume. 56, Issue 13, 131006(2019)

Surface Defect Detection of Polyvinyl Chloride Pipes Based on Machine Vision

Shuhua Li¹, Yatong Zhou^1、*, Dan Wang¹, Jingfei He¹, and Zhongwei Zhang²

¹ Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, China

² Beijing Anshi ChineLec Ltd., Beijing 100871, China

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Figures & Tables(12)

Fig. 1. Surface detection platform of PVC pipes

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Fig. 2. Surface defects on PVC pipes. (a) Pits; (b) bubbles; (c) impurities; (d) wrinkles; (e) scratches; (f) pollution

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Fig. 3. Table used to quickly look up Gamma transformation

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Fig. 4. Gamma transformation and contrast diagrams. (a) Original image; (b) area of wrinkle; (c) image after Gamma transformation

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Fig. 5. Vertical projection results of pipe

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Fig. 6. Vertical first-order differential with five differences

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Fig. 7. Schematic of fast region growing. (a) Growing point in original matrix; (b) growing results per line; (c) final growing result

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Fig. 8. Effect of block processing. (a) Point defect; (b) block projection; (c) block first-order differential

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Fig. 9. Test flow chart of surface detection platform of PVC pipes

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Fig. 10. Detection results of surface defect online detection platform of PVC pipes. (a) Pits; (b) impurities; (c) bubbles; (d) wrinkles; (e) scratches; (f) pollution

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Table 1. Comparison of time cost for Gamma transformation
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Table 1. Comparison of time cost for Gamma transformation
Imagenumber Gammatransformation /ms Gamma transformationusing look-upmethod /ms
12345678910 67.761.865.768.167.064.864.265.072.463.7 4.63.52.94.04.03.34.33.23.93.7

Table 2. Comparison of time cost for region growing
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Table 2. Comparison of time cost for region growing
Imagenumber Regiongrowing /ms Fast regiongrowing /ms
12345678910 67.761.865.768.167.064.864.265.072.463.7 4.63.52.94.04.03.34.33.23.93.7

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Shuhua Li, Yatong Zhou, Dan Wang, Jingfei He, Zhongwei Zhang. Surface Defect Detection of Polyvinyl Chloride Pipes Based on Machine Vision[J]. Laser & Optoelectronics Progress, 2019, 56(13): 131006

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