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Projector calibration method based on optical coaxial camera

Xie, Lili, Huang, Shujun, Zhang, Zonghua, Gao, F. and Jiang, Xiang (2014) Projector calibration method based on optical coaxial camera. In: International Conference on Optoelectronic Technology and Application, 13-15 May 2014, Beijing, China.

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This paper presents a novel method to accurately calibrate a DLP projector by using an optical coaxial camera to capture
the needed images. A plate beam splitter is used to make imaging axis of the CCD camera and projecting axis of the DLP
projector coaxial, so the DLP projector can be treated as a true inverse camera. A plate having discrete markers on the
surface will be designed and manufactured to calibrate the DLP projector. By projecting vertical and horizontal
sinusoidal fringe patterns on the plate surface from the projector, the absolute phase of each marker’s center can be
obtained. The corresponding projector pixel coordinate of each marker is determined from the obtained absolute phase.
The internal and external parameters of the DLP projector are calibrated by the corresponding point pair between the
projector coordinate and the world coordinate of discrete markers. Experimental results show that the proposed method
accurately obtains the parameters of the DLP projector. One advantage of the method is the calibrated internal and
external parameters have high accuracy because of uncalibrating the camera. The other is the optical coaxes geometry
gives a true inverse camera, so the calibrated parameters are more accurate than that of crossed-optical-axes, especially
the principal points and the radial distortion coefficients of the projector lens.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Copyright 2014 Society of Photo Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Subjects: Q Science > QC Physics
Schools: School of Computing and Engineering
School of Computing and Engineering > Centre for Precision Technologies
Related URLs:
Depositing User: Feng Gao
Date Deposited: 17 Nov 2016 14:51
Last Modified: 28 Aug 2021 16:33


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