Improvement of 3D shape measurement of translucent objects by applying direct-global light separation |
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| Chen Zhang, Wang Liao, Maik Rosenberger, Haoze Wang, Stephan Husung, Gunther Notni |
- Abstract:
- This paper presents a novel approach for high-precision optical 3D shape measurement of translucent objects based on phase-shifting fringe pattern projection. To address the problem of subsurface scattering, the concept of separating direct and global light components is integrated into fringe projection to enable phase value recovery solely from direct light components. In the proposed approach, the fringe patterns are modulated with shifting perpendicular high-frequency stripes, and a sparsification of these fringe-stripe patterns is applied to reduce residual phase crosstalk. Furthermore, a method for the correction of phase jumping due to global illumination in gray code projection was developed. The 3D measurement of a translucent resin plate with aluminium regions validated this proposed approach. Compared to conventional fringe projection, the proposed method reduced the mean and maximal phase error by 62.2% and 52.5%, respectively, and the root mean squared error in the plane fitting using reconstructed 3D points of the plane object was reduced from 225.4 µm to 110.1 µm. These results confirm the potential of the developed technique for accurate 3D measurement of plastic materials and biological tissues.
- Download:
- IMEKO-TC2-2025-002.pdf
- DOI:
- 10.21014/tc2-2025.002
- Event details
- IMEKO TC:
- TC2
- Event name:
- IMEKO TC2 PhotoMet 2025
- Title:
2025 IMEKO TC2 International Symposium on Modern Photonic Metrology
PhotoMet 2025 - Shaping the Future of Photonic Metrology
- Place:
- Modena, ITALY
- Time:
- 01 September 2025 - 03 September 2025