J. Eur. Opt. Soc.-Rapid Publ.
Volume 15, Number 1, 2019
|Number of page(s)
|15 January 2019
A new calibration method for line-structured light vision sensors based on concentric circle feature
College of Information Science and Engineering, Ocean University of China, Songling Road 238, 266100, Qingdao, Shandong, China
2 College of Information Science and Engineering, Ocean University of China, Qingdao, China
Accepted: 1 January 2019
Background: Determining the relative ubiety between the camera and the laser projector in a line-structured light vision sensor is a classical yet important task. Typical calibration methods often confront problems, such as difficulty of producing the target precisely and introduction of perspective projection errors.
Methods: In this work, a new calibration method based on a concentric circle feature is introduced. The proposed method is based on geometrical properties and can reduce the perspective projection error. In our method, the vanishing line of the light plane is firstly deduced from the imaged concentric circles. Then the normal vector of the light plane is determined. Consequently, the complete expression can be confirmed from the principle of the intersecting planes.
Results and conclusion: The proposed method is simple and robustness as the basic theory is geometrical properties. Accuracy evaluation experiment shows that the accuracy of the calibration method can reach 0.07 mm within the view field of about 200 × 200 mm. This accuracy is comparable to the commonly used calibration method with a checkerboard planar target, whereas our target is simple to produce.
Key words: Calibration / Concentric circles / Light plane / Vanishing line
© The Author(s) 2019
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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