A novel camera calibration method for deflectometry system

Feng Gao, Yongjia Xu, Hongyu Ren, Zonghua Zhang, Xiangqian Jiang

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

Abstract

Phase measuring deflectometry (PMD) is a well-established method to evaluate specular surface shape by detecting gradient data. In a PMD measurement, camera calibration plays a significant role. Using classical camera calibration methods to calibrate PMD system, the root mean square (RMS) of reprojection error can only be achieved for around 0.3 pixels. Therefore improvement for an accurate camera calibration in a PMD system is a special focus for PMD research. In this paper, a novel calibration method is presented to enhance camera calibration accuracy in a deflectometry system. Before calculating the initial value of internal and external parameters of the camera, pixel-by-pixel distortions are compensated by the proposed algorithm based on active phase target. Experimental results demonstrate that the proposed calibration method can effectively reduce the RMS of reprojection errors to 0.0237 pixels.

Original languageEnglish
Title of host publicationProceedings of the 16th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2016
Publishereuspen
ISBN (Electronic)9780956679086
Publication statusPublished - 2016
Event16th International Conference of the European Society for Precision Engineering and Nanotechnology - East Midlands Conference Centre, Nottingham, United Kingdom
Duration: 30 May 20163 Jun 2016
Conference number: 16
https://www.euspen.eu/events/16th-international-conference-exhibition/ (Link to Conference Website)

Conference

Conference16th International Conference of the European Society for Precision Engineering and Nanotechnology
Abbreviated titleEUSPEN 2016
CountryUnited Kingdom
CityNottingham
Period30/05/163/06/16
OtherThis event offers the possibility to see latest advances in traditional precision engineering fields such as metrology, ultra precision machining, additive and replication processes, precision mechatronic systems & control and precision cutting processes.
Internet address

Fingerprint

Cameras
cameras
Calibration
Pixels
pixels
gradients

Cite this

Gao, F., Xu, Y., Ren, H., Zhang, Z., & Jiang, X. (2016). A novel camera calibration method for deflectometry system. In Proceedings of the 16th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2016 euspen.
Gao, Feng ; Xu, Yongjia ; Ren, Hongyu ; Zhang, Zonghua ; Jiang, Xiangqian. / A novel camera calibration method for deflectometry system. Proceedings of the 16th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2016. euspen, 2016.
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title = "A novel camera calibration method for deflectometry system",
abstract = "Phase measuring deflectometry (PMD) is a well-established method to evaluate specular surface shape by detecting gradient data. In a PMD measurement, camera calibration plays a significant role. Using classical camera calibration methods to calibrate PMD system, the root mean square (RMS) of reprojection error can only be achieved for around 0.3 pixels. Therefore improvement for an accurate camera calibration in a PMD system is a special focus for PMD research. In this paper, a novel calibration method is presented to enhance camera calibration accuracy in a deflectometry system. Before calculating the initial value of internal and external parameters of the camera, pixel-by-pixel distortions are compensated by the proposed algorithm based on active phase target. Experimental results demonstrate that the proposed calibration method can effectively reduce the RMS of reprojection errors to 0.0237 pixels.",
keywords = "Camera calibration, Deflectometry, Distortion compensation, PMD",
author = "Feng Gao and Yongjia Xu and Hongyu Ren and Zonghua Zhang and Xiangqian Jiang",
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year = "2016",
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}

Gao, F, Xu, Y, Ren, H, Zhang, Z & Jiang, X 2016, A novel camera calibration method for deflectometry system. in Proceedings of the 16th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2016. euspen, 16th International Conference of the European Society for Precision Engineering and Nanotechnology, Nottingham, United Kingdom, 30/05/16.

A novel camera calibration method for deflectometry system. / Gao, Feng; Xu, Yongjia; Ren, Hongyu; Zhang, Zonghua; Jiang, Xiangqian.

Proceedings of the 16th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2016. euspen, 2016.

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

TY - GEN

T1 - A novel camera calibration method for deflectometry system

AU - Gao, Feng

AU - Xu, Yongjia

AU - Ren, Hongyu

AU - Zhang, Zonghua

AU - Jiang, Xiangqian

N1 - No full text in Eprints. HN 24/10/2017

PY - 2016

Y1 - 2016

N2 - Phase measuring deflectometry (PMD) is a well-established method to evaluate specular surface shape by detecting gradient data. In a PMD measurement, camera calibration plays a significant role. Using classical camera calibration methods to calibrate PMD system, the root mean square (RMS) of reprojection error can only be achieved for around 0.3 pixels. Therefore improvement for an accurate camera calibration in a PMD system is a special focus for PMD research. In this paper, a novel calibration method is presented to enhance camera calibration accuracy in a deflectometry system. Before calculating the initial value of internal and external parameters of the camera, pixel-by-pixel distortions are compensated by the proposed algorithm based on active phase target. Experimental results demonstrate that the proposed calibration method can effectively reduce the RMS of reprojection errors to 0.0237 pixels.

AB - Phase measuring deflectometry (PMD) is a well-established method to evaluate specular surface shape by detecting gradient data. In a PMD measurement, camera calibration plays a significant role. Using classical camera calibration methods to calibrate PMD system, the root mean square (RMS) of reprojection error can only be achieved for around 0.3 pixels. Therefore improvement for an accurate camera calibration in a PMD system is a special focus for PMD research. In this paper, a novel calibration method is presented to enhance camera calibration accuracy in a deflectometry system. Before calculating the initial value of internal and external parameters of the camera, pixel-by-pixel distortions are compensated by the proposed algorithm based on active phase target. Experimental results demonstrate that the proposed calibration method can effectively reduce the RMS of reprojection errors to 0.0237 pixels.

KW - Camera calibration

KW - Deflectometry

KW - Distortion compensation

KW - PMD

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M3 - Conference contribution

BT - Proceedings of the 16th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2016

PB - euspen

ER -

Gao F, Xu Y, Ren H, Zhang Z, Jiang X. A novel camera calibration method for deflectometry system. In Proceedings of the 16th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2016. euspen. 2016