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

机译：光电测量系统中的测斜仪装配误差校准和水平图像校正

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摘要

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.
机译：测斜仪的装配误差是影响光电测量系统测量精度的关键因素之一。为了解决测量系统中缺少完整的姿态信息的问题，提出了一种新的测斜仪装配误差标定和利用铅垂线进行水平图像校正的方法。基于将摄像机水平放置在光电系统中时场景中的铅垂线应为图像平面上的垂直线的原理，首先通过三个计算大地坐标系和测斜仪坐标系之间的方向余弦矩阵维坐标转换。然后，获得水平图像校正所需的单应矩阵以及满足测斜仪-照相机系统要求的约束方程。最后，通过优化功能校准测斜仪的装配误差。实验结果表明，在这种情况下，只能通过将倾斜角度信息与铅垂线结合使用才能校准倾角仪的装配误差。使用MATLAB进行的摄动仿真和实际实验表明了该方法的可行性。倾斜图像也可以通过在测斜仪装配误差的计算过程中获得的单应矩阵进行水平校正。

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