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Position Measurement Based on Fisheye Imaging

Shanxi Key Laboratory of Signal Capturing and Processing, North University of China, Taiyuan 030051, China
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Presented at the 7th International Symposium on Sensor Science, Napoli, Italy, 9–11 May 2019.
Proceedings 2019, 15(1), 38; https://doi.org/10.3390/proceedings2019015038
Published: 15 August 2019
(This article belongs to the Proceedings of International Symposium on Sensor Science)
PDF [562 KB, uploaded 15 August 2019]

Abstract

For the omnidirectional measurement, the collected images of large-angle fisheye lens need to be corrected and spliced before next procedure, which is complicated and inaccurate. In this paper, a direct position measurement method based on fisheye imaging is proposed for large-angle imaging without any image correcting and splicing. A nonlinear imaging system of fisheye lens is used to acquire the sequence images based on its distortion model, and the critical distortion features of the sequence images are extracted, which contains the position information. And a BP neural network is trained with the extracted image features of previous standard experimental dataset. Finally, the trained BP neural network is employed to measure the object’s distance. Experimental results demonstrate show that the proposed method achieves simple close-object distance measurement with high robustness and a measurement error of ±0.5cm. The proposed method overcomes the shortcomings of conventional measurement methods and expands the fisheye applications filed for omnidirectional measurement.
Keywords: fisheye imaging; image distortion; distance measurement; BP neural network; omnidirectional measurement fisheye imaging; image distortion; distance measurement; BP neural network; omnidirectional measurement
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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Li, X.; Li, K.; Chen, Y.; Li, Z.; Han, Y. Position Measurement Based on Fisheye Imaging. Proceedings 2019, 15, 38.

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