Projector calibration method based on optical coaxial camera

Lili Xie; Shujun Huang; Zonghua Zhang; Feng Gao; Xiangqian Jiang

doi:10.1117/12.2072858

24 November 2014 Projector calibration method based on optical coaxial camera

Lili Xie, Shujun Huang, Zonghua Zhang, Feng Gao, Xiangqian Jiang

Proceedings Volume 9301, International Symposium on Optoelectronic Technology and Application 2014: Image Processing and Pattern Recognition; 93012M (2014) https://doi.org/10.1117/12.2072858
Event: International Symposium on Optoelectronic Technology and Application 2014, 2014, Beijing, China

Abstract

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.

Citation Download Citation

Lili Xie, Shujun Huang, Zonghua Zhang, Feng Gao, and Xiangqian Jiang "Projector calibration method based on optical coaxial camera", Proc. SPIE 9301, International Symposium on Optoelectronic Technology and Application 2014: Image Processing and Pattern Recognition, 93012M (24 November 2014); https://doi.org/10.1117/12.2072858

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