Ruizhe GAO, Ailing TIAN, Feng CHEN, Dong YANG, YueYang MA. High precision measurement of ruby ball diameter by compound secondary edge detection[J]. Optics and Precision Engineering, 2023, 31(12): 1741
- Optics and Precision Engineering
- Vol. 31, Issue 12, 1741 (2023)
Fig. 1. Ruby ball measurement system device diagram
Fig. 2. Flowchart of the algorithm for Canny edge detection using adaptive thresholds
Fig. 3. Ruby original image and edge image
Fig. 4. Flow chart of quadratic edge detection algorithm based on image fusion and cubic spline interpolation
Fig. 5. Edge map comparison after two edge detections
Fig. 6. Schematic diagram of coordinate offset solution
Fig. 7. Gradient magnitude of the edge points is interpolated
Fig. 8. Quadratic curve fitting at （635，925）
Fig. 9. Ruby ball measurement results map
Fig. 10. Comparison of the results of three methods
Fig. 11. Localization errors measured at different gains and different SNRS
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Table 1. Comparison of pixel-level coordinates with subpixel-level coordinates
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Table 2. Measurement results of three components
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