Infrared and Laser Engineering, Volume. 53, Issue 2, 20230549(2024)
Calibration method of fisheye camera for high-precision collimation measurement
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Fig. 3. Calibration device of collimation measurement fisheye camera
Fig. 7. The indication that the optical axis does not coincide with the rolling axis
Fig. 9. Calibration error distribution of 4 classical camera model. (a) Stereographic projection model calibration error distribution; (b) Orthogonal projection model calibration error distribution; (c) Equisolid projection model calibration error distribution; (d) Equidistance projection model calibration error distribution
Table 1. Model parameters of virtual fisheye camera
View tableView in ArticleTable 1. Model parameters of virtual fisheye camera
Reference projection relationship Equidistance projection Equisolid projection Stereographic projection Orthogonal projection FOV 160° 160° 160° 160° Focal length 3.82 4.11 4.06 3.94 Image size/pixel 2 048(H)2 048(V) 2 048(H)2 048(V) 2 048(H)2 048(V) 2 048(H)2 048(V) Principal point coordinate 1015.33(H)992.64(V) 1037.58(H)1019.23(V) 1023.04(H)1023.59(V) 1020.98(H)1029.30(V) First order tangential distortion parameter $ 6.37\times 1{0}^{-5} $ $ 3.64\times 1{0}^{-5} $ $ -2.71\times 1{0}^{-5} $ $ 4.19\times 1{0}^{-5} $ Second order tangential distortion parameter $ 4.49\times 1{0}^{-6} $ $ -1.54\times 1{0}^{-5} $ $ 9.44\times 1{0}^{-6} $ $ 1.02\times 1{0}^{-5} $
Table 2. Parameters of fisheye camera
View tableView in ArticleTable 2. Parameters of fisheye camera
Processor XC7Z035 Image sensor GSENSE2020BSI Image format 12 bit gray Image size/pixel ${2\;048}\left({H}\right)\times {2\;048}\left({ { {V} } }\right)$ Pixel size $6.5\;\text{μ}\text{m}\times 6.5\;\text{μ}\text{m}$ Lens FOV 210° Equivalent focal length $\text{4 mm }$ Camera FOV $\text{18}{\text{0} }^{\circ }\left({H}\right)\times \text{18}{\text{0} }^{\circ }\left({V}\right)$
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Kun Xiong, Xuran He, Chunxi Wang, Jiabin Li, Changhao Yang. Calibration method of fisheye camera for high-precision collimation measurement[J]. Infrared and Laser Engineering, 2024, 53(2): 20230549
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Received: Sep. 25, 2023
Accepted: Nov. 1, 2023
Published Online: Mar. 27, 2024
The Author Email: He Xuran (15634328975@126.com)
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