Author Affiliations
1Optoelectronic System Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, Chinashow less
Fig. 1. Schematic diagram of structured light system based on fringe projection
Fig. 2. Point cloud data of valve. (a) Front view; (b) top view
Fig. 3. Cylinder valve. (a) Physical map; (b) sketch map
Fig. 4. Exact position for coordinate P and pose Q
Fig. 5. Calculation pose Q. (a) QF-2/QF-2C; (b) YSF-1
Fig. 6. Schematic diagram of each position in valve
Fig. 7. Calculation coordinate P*. (a) QF-2/QF-2C; (b) YSF-1
Fig. 8. Overall flow chart of the algorithm
Fig. 9. Valve in experimental scene
Fig. 10. Edge detection result with Canny algorithm
Fig. 11. Discrimination of detection accuracy
Fig. 12. Pre-processing. (a) Initial localization; (b) segmentation result
Fig. 13. Algorithm performance for defective data. (a) Reflection; (b) incomplete shooting
Fig. 14. Coordinate error results for different algorithms
Scanning speed /(frame·s-1) | Resolution /pixel | Center distance /mm | Measurement range /mm | FOV /mm | Repeatability /μm |
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2.1 | 3.2 | 1500 | ±300 | 600×450 | 75 |
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Table 1. 3D camera performance parameters
Orientationerror /rad | 0-0.01 | 0.01-0.02 | 0.02-0.03 | 0.03-0.04 |
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Number of valves for QF-2 | 8 | 18 | 3 | 1 | Number of valves for YSF-1 | 10 | 19 | 1 | 0 |
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Table 2. Distribution of orientation errors
Coordinate error /mm | 0.1-0.2 | 0.2-0.3 | 0.3-0.4 | 0.4-0.5 | 0.5-0.6 | 0.6-0.7 |
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Number of valves for QF-2 | 3 | 8 | 9 | 6 | 3 | 1 | Number of valves for YSF-1 | 2 | 8 | 10 | 5 | 3 | 2 |
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Table 3. Distribution of coordinate errors
Situation | Coordinate P /mm | Coordinate P' /mm | Error /mm |
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(a) | (12.045, -35.056, 96.976) | (12.270, -35.391, 96.874) | 0.416 | (b) | (8.268, -8.520, 85.013) | (8.057, -8.328, 84.898) | 0.328 |
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Table 4. Coordinate errors for situation (a)&(b)