Flexible one-shot geometric calibration for off-axis deflectometry

Zhenqi Niu; Xiangchao Zhang; Junqiang Ye; Yifan Zhu; Min Xu; Xiangqian Jiang

doi:10.1364/AO.388143

Flexible one-shot geometric calibration for off-axis deflectometry

Zhenqi Niu, Xiangchao Zhang, Junqiang Ye, Yifan Zhu, Min Xu, Xiangqian Jiang

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

Off-axis deflectometry is widely applied in the measurement of specular surfaces. However, the measuring accuracy depends on the reliability of geometrical calibration. Existing methods are inconvenient to be utilized due to their disadvantages of low efficiency and operational complexity. A simple geometrical calibration method is proposed by applying a flat mirror with markers, and only one image needs to be captured. A compensation process is introduced to correct the form error of the mirror. Experimental results show that the re-projection errors decrease from 0.319 pixels down to 0.12 pixels; thus the measuring efficiency and accuracy of optical surfaces can be greatly improved.

Original language	English
Pages (from-to)	3819-3824
Number of pages	6
Journal	Applied Optics
Volume	59
Issue number	13
Early online date	21 Apr 2020
DOIs	https://doi.org/10.1364/AO.388143
Publication status	Published - 1 May 2020

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title = "Flexible one-shot geometric calibration for off-axis deflectometry",

abstract = "Off-axis deflectometry is widely applied in the measurement of specular surfaces. However, the measuring accuracy depends on the reliability of geometrical calibration. Existing methods are inconvenient to be utilized due to their disadvantages of low efficiency and operational complexity. A simple geometrical calibration method is proposed by applying a flat mirror with markers, and only one image needs to be captured. A compensation process is introduced to correct the form error of the mirror. Experimental results show that the re-projection errors decrease from 0.319 pixels down to 0.12 pixels; thus the measuring efficiency and accuracy of optical surfaces can be greatly improved.",

keywords = "Calibration, Efficiency, Error compensation, Mirrors, Pixels, off-axis deflectometry",

author = "Zhenqi Niu and Xiangchao Zhang and Junqiang Ye and Yifan Zhu and Min Xu and Xiangqian Jiang",

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T1 - Flexible one-shot geometric calibration for off-axis deflectometry

AU - Niu, Zhenqi

AU - Zhang, Xiangchao

AU - Ye, Junqiang

AU - Zhu, Yifan

AU - Xu, Min

AU - Jiang, Xiangqian

PY - 2020/5/1

Y1 - 2020/5/1

N2 - Off-axis deflectometry is widely applied in the measurement of specular surfaces. However, the measuring accuracy depends on the reliability of geometrical calibration. Existing methods are inconvenient to be utilized due to their disadvantages of low efficiency and operational complexity. A simple geometrical calibration method is proposed by applying a flat mirror with markers, and only one image needs to be captured. A compensation process is introduced to correct the form error of the mirror. Experimental results show that the re-projection errors decrease from 0.319 pixels down to 0.12 pixels; thus the measuring efficiency and accuracy of optical surfaces can be greatly improved.

AB - Off-axis deflectometry is widely applied in the measurement of specular surfaces. However, the measuring accuracy depends on the reliability of geometrical calibration. Existing methods are inconvenient to be utilized due to their disadvantages of low efficiency and operational complexity. A simple geometrical calibration method is proposed by applying a flat mirror with markers, and only one image needs to be captured. A compensation process is introduced to correct the form error of the mirror. Experimental results show that the re-projection errors decrease from 0.319 pixels down to 0.12 pixels; thus the measuring efficiency and accuracy of optical surfaces can be greatly improved.

KW - Calibration

KW - Efficiency

KW - Error compensation

KW - Mirrors

KW - Pixels

KW - off-axis deflectometry

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JO - Applied Optics

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Flexible one-shot geometric calibration for off-axis deflectometry

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