Yue et al. revised changes accepted.pdf (1.2 MB)
Reduction of systematic errors in structured light metrology at discontinuities in surface reflectivity
journal contribution
posted on 2018-08-06, 13:24 authored by Huimin Yue, Harshana G. Dantanarayana, Yuxiang Wu, Jonathan HuntleyIn measuring 3D shape with structured light techniques, systematic errors arise in the
neighbourhood of discontinuities in reflectivity or geometry. A mechanism for this phenomenon is proposed, based on the finite size of the imaging system’s point spread function. A theoretical analysis for the phase errors in a phase-shifting projected fringe system is given, from which a correction algorithm to minimise the systematic errors is presented. In this algorithm, a closed form expression for the errors based on the intensity values and the phase values in a neighbourhood excluding the affected region is used to remove the estimated error from the measured phase values within the affected region. Experiments on samples with both linear and circular discontinuities in reflectivity
demonstrated respective reductions in systematic errors by factors of 2.5× and 3×.
Funding
The authors gratefully acknowledge financial support from the Engineering and Physical Sciences Research Council under the Light Controlled Factory project EP/K018124/1. This work was also supported by National Nature Science Foundation of China (Grant No. 61421002), and the Fundamental Research Funds for the Central Universities (Grant No. JB180505).
History
School
- Mechanical, Electrical and Manufacturing Engineering
Published in
Optics and Lasers in EngineeringCitation
YUE, H. ... et al, 2019. Reduction of systematic errors in structured light metrology at discontinuities in surface reflectivity. Optics and Lasers in Engineering, 112, pp. 68-76.Publisher
© ElsevierVersion
- AM (Accepted Manuscript)
Publisher statement
This paper was accepted for publication in the journal Optics and Lasers in Engineering and the definitive published version is available at https://doi.org/10.1016/j.optlaseng.2018.08.002.Acceptance date
2018-08-05Publication date
2018-09-14ISSN
0143-8166Publisher version
Language
- en