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Proceedings Paper

Calibration of telecentric cameras with distortion center estimation
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Paper Abstract

A distortion-free telecentric camera dose not have an optical center because of the orthogonal projection. However, the position of optical center should be known when the lens distortion is considered. Since the full-scale parameters are derived through an iterative algorithm, critical initial values of the optical center should be provided to avoid being trapped in local minima. In this paper, we proposed a two-step algorithm to estimate the optical center as the trustworthy initial value for the subsequent iteration process. The first step is directly calculating the pixel coordinates of the lateral distortion center using the extracted control points. The second step is optimizing both lateral and tangential coefficients considering the properties of the affine transformation in the imaging process. The effectiveness of our proposed method is proven by the measurement results using a new developed microscopic telecentric stereovision system.

Paper Details

Date Published: 24 July 2018
PDF: 6 pages
Proc. SPIE 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 1082720 (24 July 2018); doi: 10.1117/12.2500463
Show Author Affiliations
Yan Hu, Nanjing Univ. of Science and Technology (China)
Shijie Feng, Nanjing Univ. of Science and Technology (China)
Tianyang Tao, Nanjing Univ. of Science and Technology (China)
Chao Zuo, Nanjing Univ. of Science and Technology (China)
Qian Chen, Nanjing Univ. of Science and Technology (China)
Anand Asundi, Nanyang Technological Univ. (Singapore)


Published in SPIE Proceedings Vol. 10827:
Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018)
Yingjie Yu; Chao Zuo; Kemao Qian, Editor(s)

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