基于光场成像的三点式光笔测量方法 
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Three-Point Light Pen Measurement Method Based on Light Field Imaging
1 中国民航大学电子信息与自动化学院, 天津 300300
2 中国民航大学航空工程学院, 天津 300300
3 天津大学精密测试技术及仪器国家重点实验室, 天津 300072
图 & 表
图 1. 测量系统流程图
Fig. 1. Flow chart of measurement system
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图 2. P3P投影示意图
Fig. 2. Diagram of P3P projection
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图 3. 光场成像原理示意图
Fig. 3. Diagram of principle of light field imaging
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图 4. 数字重聚焦过程
Fig. 4. Digital refocusing
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图 5. 全部窗口光场图像
Fig. 5. Light field images of all windows
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图 6. 局域窗口光场图像
Fig. 6. Light field image of local window
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图 7. 对比测量系统
Fig. 7. Contrast measurement system
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图 8. 光笔设计图
Fig. 8. Design of light pen
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图 9. 局域四维光场
Fig. 9. Local four-dimensional light field
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表 1标定结果
Table1. Calibration results
| Internal parameter | Calibration value |
|---|
| c /mm | 22.441 | | fc /mm | (1296.24851,1296.28441) | | cc /mm | (311.53056,223.32054) | | kc /mm | (-0.29994,0.78014,0.00012,-0.00133,0.00000) | | err /pixel | (0.05143,0.05310) |
|
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表 2沿X轴方向对比实验的结果
Table2. Results of contrast experiments along X-axis directionmm
| Reference data of translation stage | 50 | 100 | 150 | 200 |
|---|
| Measurementresults | Maximum | 50.336 | 100.546 | 150.428 | 200.215 | | | Minimum | 49.536 | 100.131 | 150.224 | | 199.343 | | Average value | 50.250 | 100.346 | 150.334 | | 199.655 | | Correct rate (compared with reprojection results) | True | True | True | True |
|
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表 3沿Y轴方向对比实验的结果
Table3. Results of contrast experiments along Y-axis directionmm
| Reference data of translation stage | 50 | 100 | 150 | 200 |
|---|
| Measurementresults | Maximum | 50.426 | 100.525 | 150.328 | 200.316 | | | Minimum | 50.224 | 100.136 | 149.860 | | 200.024 | | Average value | 50.336 | 100.395 | 150.157 | | 200.254 | | Correct rate (compared with reprojection results) | True | True | True | True |
|
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表 4沿Z轴方向对比实验的结果
Table4. Results of contrast experiments along Z-axis directionmm
| Reference data of translation stage | 50 | 100 | 150 | 200 |
|---|
| Measurementresults | Maximum | 50.725 | 100.634 | 150.536 | 200.465 | | | Minimum | 49.982 | 100.152 | 149.826 | | 200.036 | | Average value | 50.535 | 100.462 | 150.235 | | 200.240 | | Correct rate (compared with reprojection results) | True | True | True | True |
|
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于之靖, 郑建文, 陶永奎, 吴军. 基于光场成像的三点式光笔测量方法[J]. 激光与光电子学进展, 2020, 57(3): 032001. Zhijing Yu, Jianwen Zheng, Yongkui Tao, Jun Wu. Three-Point Light Pen Measurement Method Based on Light Field Imaging[J]. Laser & Optoelectronics Progress, 2020, 57(3): 032001.
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