Yan Kang, Ruikai Xue, Lifei Li, Tongyi Zhang, Qi Gao. Coaxial Scanning Three-dimensional Imaging Based on SPAD Array[J]. Laser & Optoelectronics Progress, 2021, 58(10): 1011024
- Laser & Optoelectronics Progress
- Vol. 58, Issue 10, 1011024 (2021)
Fig. 1. Experimental system structure
Fig. 2. Schematic of common path array scanning imaging
Fig. 3. Calibration pattern and its alignment pattern with FOV and laser dot matrix. (a) Calibration pattern; (b) receiving FOV after calibration; (c) illumination dot matrix after calibration
Fig. 4. Diagram of FOV deviation in bi-static mode [26]
Fig. 5. Photon count distribution curves of backward reflection and echo signals under different conditions. (a) Front surface of PBS is placed perpendicular to outgoing beam; (b) front surface of PBS is placed at small angle with outgoing beam
Fig. 6. Distribution of dark count rate of each pixel in SPAD array. (a) 1st collection; (b) 2nd collection; (c) 3rd collection; (d) 4th collection; (e) 5th collection; (f) distribution of pixels with dark count rate greater than 200 Hz on planar array
Fig. 7. 1D distribution of dark count rate
Fig. 8. Target scene and imaging results before and after correction. (a) Target scene; (b) distance image before correction; (c) distance image after correction
Fig. 9. Imaging target and experimental site photograph
Fig. 10. Scanning trace
Fig. 11. Reference ground truth image of target
Fig. 12. Low resolution and high resolution scan reconstruction distance images. (a) Scanning point 1 in Fig. 10 ; (b) scanning point 2 in Fig. 10 ; (c) scanning point 3 in Fig. 10 ; (d) scanning point 4 in Fig. 10 ; (e) high resolution distance image obtained by scanning reconstruction
Fig. 13. Imaging results under different SPP conditions. (a) 8.49; (b) 4.28; (c) 1.23; (d) 0.86; (e) 0.44
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Table 1. Performance parameters of experimental system
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Table 2. MAE values under different SPP conditions
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