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.
Highlights
The photoelectric measurement system detects and measures objects by placing a visible CCD or an infrared CCD in a fixed site
We propose a practical x coordinates ( xA1 the means that points on plumb line AB should have the same x coordinates (x A1 = x B1, x A2 = x B2 ) in method aiming to calibrate the inclinometer error
This paper analyzes the expression of inclinometer assembly error in photoelectric systems
Summary
The photoelectric measurement system detects and measures objects by placing a visible CCD or an infrared CCD in a fixed site. With the rapid development and wide application of these devices, the calibration of photoelectric measurement systems is becoming a hot research topic both domestically and overseas, as they are widely used in aerospace, navigation [7,8,9,10,11], automotive robots [12,13], and many other fields [14]. Low cost [3,4,5], high precision, small size, low power dissipation, high overload and high reliability are the directions in which the development of photoelectric measurement systems is focused [15,16,17,18]. Detectors in photoelectric measurement systems should have high angular resolution, which increases the measurement accuracy.
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