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- Title
Phase Error Analysis and Correction for Crossed-Grating Phase-Shifting Profilometry.
- Authors
Li, Fuqian; Chen, Wenjing
- Abstract
Crossed-grating phase-shifting profilometry (CGPSP) has great utility in three-dimensional shape measurement due to its ability to acquire horizontal and vertical phase maps in a single measurement. However, CGPSP is extremely sensitive to the non-linearity effect of a digital fringe projection system, which is not studied in depth yet. In this paper, a mathematical model is established to analyze the phase error caused by the non-linearity effect. Subsequently, two methods used to eliminate the non-linearity error are discussed in detail. To be specific, a double five-step algorithm based on the mathematical model is proposed to passively suppress the second non-linearity. Furthermore, a precoding gamma correction method based on probability distribution function is introduced to actively attenuate the non-linearity of the captured crossed fringe. The comparison results show that the active gamma correction method requires less fringe patterns and can more effectively reduce the non-linearity error compared with the passive method. Finally, employing CGPSP with gamma correction, a faster and reliable inverse pattern projection is realized with less fringe patterns.
- Subjects
DIFFRACTION patterns; SHAPE measurement; DISTRIBUTION (Probability theory); ALGORITHMS; MATHEMATICAL models
- Publication
Sensors (14248220), 2021, Vol 21, Issue 19, p6475
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s21196475