Projector calibration method based on optical coaxial camera

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

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.

Original languageEnglish
Title of host publicationInternational Symposium on Optoelectronic Technology and Application 2014: Image Processing and Pattern Recognition
PublisherSPIE
Volume9301
ISBN (Electronic)9781628413878
DOIs
Publication statusPublished - 2014
EventInternational Symposium on Optoelectronic Technology and Application: Image Processing and Pattern Recognition - Beijing, China
Duration: 13 May 201415 May 2014

Conference

ConferenceInternational Symposium on Optoelectronic Technology and Application
Abbreviated titleIPTA 2014
CountryChina
CityBeijing
Period13/05/1415/05/14

Fingerprint

Coaxial
projectors
Projector
Calibration
Camera
Cameras
cameras
markers
CCD cameras
Lenses
Pixels
Imaging techniques
Principal Points
Geometry
Internal
Beam Splitter
CCD Camera
beam splitters
Lens
High Accuracy

Cite this

Xie, L., Huang, S., Zhang, Z., Gao, F., & Jiang, X. (2014). Projector calibration method based on optical coaxial camera. In International Symposium on Optoelectronic Technology and Application 2014: Image Processing and Pattern Recognition (Vol. 9301). [93012M] SPIE. https://doi.org/10.1117/12.2072858
Xie, Lili ; Huang, Shujun ; Zhang, Zonghua ; Gao, Feng ; Jiang, Xiangqian. / Projector calibration method based on optical coaxial camera. International Symposium on Optoelectronic Technology and Application 2014: Image Processing and Pattern Recognition. Vol. 9301 SPIE, 2014.
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Xie, L, Huang, S, Zhang, Z, Gao, F & Jiang, X 2014, Projector calibration method based on optical coaxial camera. in International Symposium on Optoelectronic Technology and Application 2014: Image Processing and Pattern Recognition. vol. 9301, 93012M, SPIE, International Symposium on Optoelectronic Technology and Application, Beijing, China, 13/05/14. https://doi.org/10.1117/12.2072858

Projector calibration method based on optical coaxial camera. / Xie, Lili; Huang, Shujun; Zhang, Zonghua; Gao, Feng; Jiang, Xiangqian.

International Symposium on Optoelectronic Technology and Application 2014: Image Processing and Pattern Recognition. Vol. 9301 SPIE, 2014. 93012M.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AU - Huang, Shujun

AU - Zhang, Zonghua

AU - Gao, Feng

AU - Jiang, Xiangqian

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N2 - 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.

AB - 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.

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Xie L, Huang S, Zhang Z, Gao F, Jiang X. Projector calibration method based on optical coaxial camera. In International Symposium on Optoelectronic Technology and Application 2014: Image Processing and Pattern Recognition. Vol. 9301. SPIE. 2014. 93012M https://doi.org/10.1117/12.2072858