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Real-time 3D surface-shape measurement using background-modulated modified Fourier transform profilometry with geometry-constraint
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DOI：10.1016/j.optlaseng.2018.11.014.png)
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Abstract
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A new real-time 3D measurement method was developed using new background-modulated modified Fourier transform profilometry (FTP) fringe patterns and geometry constraints. The method uses only two new high-frequency fringe patterns for every 3D reconstruction from phase maps. A short camera-projector baseline allows only two corresponding-point candidates in the measurement volume for reliable corresponding-point selection, even with high-frequency fringe patterns, and a new calibration approach reduces error induced by the short baseline. The new background-modulated modified FTP method had higher measurement accuracy in dynamic measurement of a moving object than using phase-shifting-profilometry with background modulation and geometry constraints. GPU processing permits 3D reconstruction in parallel with image capture.
Keywords:
Surface-shape measurement
Fringe projection
Geometry Constraints
Fourier transform profilometry
Optical metrology
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