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Temporal fringe projection profilometry: Modified fringe-frequency range for error reduction
•The modified fringe-phase interval allows the analysis of the fringe image sequence with other signal processing methods.•The modified fringe-phase interval allows considerably reduce measurement errors.•Comparison with outstanding temporal phase-unwrapping methods shows a substantial reduction in...
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Published in: | Optics and lasers in engineering 2022-02, Vol.149, p.106788, Article 106788 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | •The modified fringe-phase interval allows the analysis of the fringe image sequence with other signal processing methods.•The modified fringe-phase interval allows considerably reduce measurement errors.•Comparison with outstanding temporal phase-unwrapping methods shows a substantial reduction in measurement error.
Temporal techniques for fringe projection profilometry, in particular the multi-frequency class, require the projection of a sequence of fringes with preset frequencies. In this paper, we analyze the generation of fringes that offers better conditions to process them through the modification of the fringe-frequency range, which may reduce measurement errors. This will also serve to expand the possibilities of being able to process the fringe information through different signal-processing methods. Additionally, in this work, we derive a first-approximation frequency-to-height conversion formula and describe an algorithm to process the fringe image sequence through the Continuous Wavelet-Transform (CWT). Experimental results with simulations and real applications are presented as well. |
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ISSN: | 0143-8166 1873-0302 |
DOI: | 10.1016/j.optlaseng.2021.106788 |