Infrared and Laser Engineering, Volume. 51, Issue 6, 20210472(2022)
Calibration method of liquid lens focusing system for machine vision measurement
Figures & Tables(10)
Fig. 1. Optical scheme of liquid lens focusing system and working principle of typical focusing system
Fig. 2. Structure diagram and electric controlling principle of liquid lens based on elastic membrane cavity
Fig. 4. Relationship between liquid lens' surface vertex offset and deflection angle of chief ray
Fig. 7. Test data and fit result of reference temperature equivalent current
Fig. 8. Calibration result of gravity induced principle point offset
Fig. 9. Statistical result of positional error using intrinsic parameters acquired by different methods
Table 1. Expression of intrinsic parameters and fitted coefficients
View tableView in ArticleTable 1. Expression of intrinsic parameters and fitted coefficients
Expression of fitting intrinsic parameters Fitted coefficients P1 P2 P3 $ {f_x} = \dfrac{1}{{{P_1} \cdot {I^{(0)}} + {P_2}}} $ −4.366×10−8 1.100×10−4 - $ {f_y} = \dfrac{1}{{{P_1} \cdot {I^{(0)}} + {P_2}}} $ −4.006×10−8 1.097×10−4 - $ {v_0} = {P_1} \cdot \Delta {y_{img}} + {P_2} $ 68.126 659.556 - ${k_1} = {P_1} \cdot f_{mean(norm)}^2 + {P_2} \cdot {f_{mean(norm)} } + {P_3}$ −1.772×10−2 6.134×10−2 1.367×10−2 ${k_2} = {P_1} \cdot f_{mean(norm)}^2 + {P_2} \cdot {f_{mean(norm)} } + {P_3}$ 1.198 −2.701 −18.785 ${p_1} = {P_1} \cdot f_{mean(norm)}^2 + {P_2} \cdot {f_{mean(norm)} } + {P_3}$ 8.530×10−4 −3.357×10−3 1.002×10−2 ${p_2} = {P_1} \cdot f_{mean(norm)}^2 + {P_2} \cdot {f_{mean(norm)} } + {P_3}$ −1.060×10−3 8.194×10−4 4.432×10−4
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Yang Li, Guoming Wang, Ying Wang, Zhi Cheng, Weihu Zhou, Dengfeng Dong. Calibration method of liquid lens focusing system for machine vision measurement[J]. Infrared and Laser Engineering, 2022, 51(6): 20210472
Paper Information
Category: Photoelectric measurement
Received: Jul. 13, 2021
Accepted: --
Published Online: Dec. 20, 2022
The Author Email: Zhou Weihu (zhouweihu@ime.ac.cn), Dong Dengfeng (dongdengfeng@ime.ac.cn)
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