Calibration of telecentric cameras with distortion center estimation

Yan Hu; Shijie Feng; Tianyang Tao; Chao Zuo; Qian Chen; Anand Asundi

doi:10.1117/12.2500463

24 July 2018 Calibration of telecentric cameras with distortion center estimation

Yan Hu, Shijie Feng, Tianyang Tao, Chao Zuo, Qian Chen, Anand Asundi

Proceedings Volume 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018); 1082720 (2018) https://doi.org/10.1117/12.2500463
Event: Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 2018, Shanghai, China

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.

Citation Download Citation

Yan Hu, Shijie Feng, Tianyang Tao, Chao Zuo, Qian Chen, and Anand Asundi "Calibration of telecentric cameras with distortion center estimation", Proc. SPIE 10827, Sixth International Conference on Optical and Photonic Engineering (icOPEN 2018), 1082720 (24 July 2018); https://doi.org/10.1117/12.2500463

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