Method of detecting the defects of the end face of  steel coils

Liting Zhu; Jinbo Chen; Jinjun Rao; Mei Liu

doi:10.1117/12.2541642

16 October 2019 Method of detecting the defects of the end face of steel coils

Liting Zhu, Jinbo Chen, Jinjun Rao, Mei Liu

Proceedings Volume 11205, Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019); 112051A (2019) https://doi.org/10.1117/12.2541642
Event: Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019), 2019, Phuket, Thailand

Abstract

Due to the excessively dense steel coil layers on the end face of the rolled coil, it is difficult to extract the defect area of the end face of rolled steel by the image segmentation methods such as edge detection and threshold segmentation. Aiming at the dense texture features of the end face of rolled steel coil, a method of detecting the defects of the end face of steel coils was proposed. Based on the theoretical technology of machine vision, this paper proposed a double threshold method to extract potential defect area and eliminate the background area and the completely defect-free area. In the double threshold method, we utilize the Canny operator and the PPHT (Progressive Probabilistic Hough Transform) to adjust the direction of the image block on the end face of the steel coils, makes the texture direction on each image block consistent. Then, Gaussian steerable filter, followed by second Canny and PPHT, was applied to enhance image. After the double threshold method, projective integral of digital image was utilized to extract the feature of the potential defects area. Finally, the SVM (Support Vector Machine) is applied to determine the type of the defect. The results show that the method of detecting the defects of the end face of steel coils can accurately and quickly detect defects even on the end face image of the steel coils with dense layers.

Citation Download Citation

Liting Zhu, Jinbo Chen, Jinjun Rao, and Mei Liu "Method of detecting the defects of the end face of steel coils", Proc. SPIE 11205, Seventh International Conference on Optical and Photonic Engineering (icOPEN 2019), 112051A (16 October 2019); https://doi.org/10.1117/12.2541642

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KEYWORDS

Defect detection

Image enhancement

Image filtering

Feature extraction

Digital imaging

Image processing

Detection and tracking algorithms

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