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 journalArticlepeer-review

19 Citations (Scopus)


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 languageEnglish
Pages (from-to)3819-3824
Number of pages6
JournalApplied Optics
Issue number13
Early online date21 Apr 2020
Publication statusPublished - 1 May 2020


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