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Sensors 2018, 18(1), 248; https://doi.org/10.3390/s18010248

Inclinometer Assembly Error Calibration and Horizontal Image Correction in Photoelectric Measurement Systems

1
Jiangsu Key Laboratory of Spectral Imaging and Intelligent Sense, School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
2
Jilin Jiangji Special Industries Co., Ltd., Zun Yi West Road 17#, Jilin 132021, China
*
Author to whom correspondence should be addressed.
Received: 6 November 2017 / Revised: 5 January 2018 / Accepted: 13 January 2018 / Published: 16 January 2018
(This article belongs to the Special Issue Charge-Coupled Device (CCD) Sensors)
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Abstract

Inclinometer assembly error is one of the key factors affecting the measurement accuracy of photoelectric measurement systems. In order to solve the problem of the lack of complete attitude information in the measurement system, this paper proposes a new inclinometer assembly error calibration and horizontal image correction method utilizing plumb lines in the scenario. Based on the principle that the plumb line in the scenario should be a vertical line on the image plane when the camera is placed horizontally in the photoelectric system, the direction cosine matrix between the geodetic coordinate system and the inclinometer coordinate system is calculated firstly by three-dimensional coordinate transformation. Then, the homography matrix required for horizontal image correction is obtained, along with the constraint equation satisfying the inclinometer-camera system requirements. Finally, the assembly error of the inclinometer is calibrated by the optimization function. Experimental results show that the inclinometer assembly error can be calibrated only by using the inclination angle information in conjunction with plumb lines in the scenario. Perturbation simulation and practical experiments using MATLAB indicate the feasibility of the proposed method. The inclined image can be horizontally corrected by the homography matrix obtained during the calculation of the inclinometer assembly error, as well. View Full-Text
Keywords: photoelectric measurement; inclinometer assembly error calibration; plumb line; horizontal image correction; Euler algorithm photoelectric measurement; inclinometer assembly error calibration; plumb line; horizontal image correction; Euler algorithm
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Kong, X.; Chen, Q.; Wang, J.; Gu, G.; Wang, P.; Qian, W.; Ren, K.; Miao, X. Inclinometer Assembly Error Calibration and Horizontal Image Correction in Photoelectric Measurement Systems. Sensors 2018, 18, 248.

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