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Sensors 2017, 17(12), 2963; https://doi.org/10.3390/s17122963

Out-of-Focus Projector Calibration Method with Distortion Correction on the Projection Plane in the Structured Light Three-Dimensional Measurement System

School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
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Author to whom correspondence should be addressed.
Received: 17 October 2017 / Revised: 18 December 2017 / Accepted: 19 December 2017 / Published: 20 December 2017
(This article belongs to the Section Physical Sensors)

Abstract

The three-dimensional measurement system with a binary defocusing technique is widely applied in diverse fields. The measurement accuracy is mainly determined by out-of-focus projector calibration accuracy. In this paper, a high-precision out-of-focus projector calibration method that is based on distortion correction on the projection plane and nonlinear optimization algorithm is proposed. To this end, the paper experimentally presents the principle that the projector has noticeable distortions outside its focus plane. In terms of this principle, the proposed method uses a high-order radial and tangential lens distortion representation on the projection plane to correct the calibration residuals caused by projection distortion. The final accuracy parameters of out-of-focus projector were obtained using a nonlinear optimization algorithm with good initial values, which were provided by coarsely calibrating the parameters of the out-of-focus projector on the focal and projection planes. Finally, the experimental results demonstrated that the proposed method can accuracy calibrate an out-of-focus projector, regardless of the amount of defocusing. View Full-Text
Keywords: calibration; out-of-focus projector; distortion correction; focal plane; projection plane calibration; out-of-focus projector; distortion correction; focal plane; projection plane
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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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Zhang, J.; Zhang, Y.; Chen, B. Out-of-Focus Projector Calibration Method with Distortion Correction on the Projection Plane in the Structured Light Three-Dimensional Measurement System. Sensors 2017, 17, 2963.

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