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Appl. Sci. 2018, 8(8), 1399; https://doi.org/10.3390/app8081399

Calibration Method of Orthogonally Splitting Imaging Pose Sensor Based on General Imaging Model

1,2
,
1
and
1,*
1
State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
2
College of Computer and Information Engineering, Tianjin Agricultural University, Tianjin 300384, China
*
Author to whom correspondence should be addressed.
Received: 2 July 2018 / Revised: 26 July 2018 / Accepted: 6 August 2018 / Published: 19 August 2018
(This article belongs to the Special Issue Precision Dimensional Measurements)
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Abstract

Orthogonally splitting imaging pose sensor is a new sensor with two orthogonal line array charge coupled devices (CCDs). Owing to its special structure, there are distortion correction and imaging model problems during the calibration procedure. This paper proposes a calibration method based on the general imaging model to solve these problems. The method introduces Plücker Coordinate to describe the mapping relation between the image coordinate system and the world coordinate system. This paper solves the mapping relation with radial basis function interpolation and adaptively selecting control points with Kmeans clustering method to improve the fitting accuracy. This paper determines the appropriate radial basis function and its shape parameter by experiments. And these parameters are used to calibrate the orthogonally splitting imaging pose sensor. According to the calibration result, the root mean square (RMS)of calibration dataset and the RMS of test dataset are 0.048 mm and 0.049 mm. A comparative experiment is conducted between the pinhole imaging model and the general imaging model. Experimental results show that the calibration method based on general imaging model applies to the orthogonally splitting imaging pose sensor. The calibration method requires only one image corresponding to the target in the world coordinates and distortion correction is not required to be taken into account. Compared with the calibration method based on the pinhole imaging model, the calibration procedure based on the general imaging model is easier and accuracy is greater. View Full-Text
Keywords: orthogonally splitting imaging pose sensor; general imaging model; radial basis function interpolation orthogonally splitting imaging pose sensor; general imaging model; radial basis function interpolation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zhao, N.; Sun, C.; Wang, P. Calibration Method of Orthogonally Splitting Imaging Pose Sensor Based on General Imaging Model. Appl. Sci. 2018, 8, 1399.

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