Chunjian Hua, Xuemei Xiong, Ying Chen. Feature Extraction of Workpiece Circular Arc Contour Based on Sobel Operator[J]. Laser & Optoelectronics Progress, 2018, 55(2): 021011
- Laser & Optoelectronics Progress
- Vol. 55, Issue 2, 021011 (2018)
Fig. 1. Edge detection diagram of Sobel operator. (a) Gray-scale image and (b) edge detection of arc workpiece
Fig. 2. Two points extracted in the gray-scale image of the workpiece
![Construction process of invariant feature[17]. (a) Point set; (b) convex hull of point set; (c) triangle construction](/Images/icon/loading.gif){kind=icon}
Fig. 3. Construction process of invariant feature[17]. (a) Point set; (b) convex hull of point set; (c) triangle construction
Fig. 4. Edge contour feature extraction diagram of the workpiece
Fig. 5. Radius distribution histogram in polar coordinate
Fig. 6. Radius distribution in polar coordinate
Fig. 7. Outer contour point of the arc workpiece
Fig. 8. Photograph of experimental setup
Fig. 9. Gray-scale image of the workpiece under monocular photography
Fig. 10. Comparison of the extracted outer contour maps with (a) the algorithm in Ref. [12] and (b) the proposed algorithm
Fig. 11. VMSE versus L
Fig. 12. Adaptive weight value β under different illumination intensities
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Table 1. MSE of the extracted outer contour points with the proposed algorithm
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Table 2. MSE of the extracted inner contour points with the proposed algorithm
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Table 3. MSE of the extracted outer contour points with the algorithm in Ref. [12]
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Table 4. MSE for outer contour points under different illumination intensities
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