Method of orthogonally splitting imaging pose measurement

Na Zhao; Changku Sun; Peng Wang; Qian Yang; Xintong Liu

doi:10.1117/12.2286024

12 January 2018 Method of orthogonally splitting imaging pose measurement

Na Zhao, Changku Sun, Peng Wang, Qian Yang, Xintong Liu

Proceedings Volume 10621, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems; 106210R (2018) https://doi.org/10.1117/12.2286024
Event: International Conference on Optical Instruments and Technology 2017, 2017, Beijing, China

Abstract

In order to meet the aviation’s and machinery manufacturing’s pose measurement need of high precision, fast speed and wide measurement range, and to resolve the contradiction between measurement range and resolution of vision sensor, this paper proposes an orthogonally splitting imaging pose measurement method. This paper designs and realizes an orthogonally splitting imaging vision sensor and establishes a pose measurement system. The vision sensor consists of one imaging lens, a beam splitter prism, cylindrical lenses and dual linear CCD. Dual linear CCD respectively acquire one dimensional image coordinate data of the target point, and two data can restore the two dimensional image coordinates of the target point. According to the characteristics of imaging system, this paper establishes the nonlinear distortion model to correct distortion. Based on cross ratio invariability, polynomial equation is established and solved by the least square fitting method. After completing distortion correction, this paper establishes the measurement mathematical model of vision sensor, and determines intrinsic parameters to calibrate. An array of feature points for calibration is built by placing a planar target in any different positions for a few times. An terative optimization method is presented to solve the parameters of model. The experimental results show that the field angle is 52 °, the focus distance is 27.40 mm, image resolution is 5185×5117 pixels, displacement measurement error is less than 0.1mm, and rotation angle measurement error is less than 0.15°. The method of orthogonally splitting imaging pose measurement can satisfy the pose measurement requirement of high precision, fast speed and wide measurement range.

Citation Download Citation

Na Zhao, Changku Sun, Peng Wang, Qian Yang, and Xintong Liu "Method of orthogonally splitting imaging pose measurement", Proc. SPIE 10621, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 106210R (12 January 2018); https://doi.org/10.1117/12.2286024

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KEYWORDS

Distortion

Sensors

Charge-coupled devices

Image sensors

Imaging systems

Mirrors

CCD image sensors

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