Robust Dynamic 3D Shape Measurement with Hybrid Fourier-Transform Phase-Shifting Profilometry

Abstract

In this work, we propose a novel hybrid Fourier-transform phase-shifting profilometry method to integrate the advantages of Fourier-transform profilometry (FTP) and phase-shifting profilometry (PSP). The motion vulnerability of multi-shot PSP can be significantly alleviated through the combination of single-shot FTP, while the high accuracy of PSP can also be preserved when the object is motionless. We design a phase-based pixel-wise motion detection strategy that can accurately outline the moving object regions from their motionless counterparts. The final measurement result is obtained by fusing the determined regions where the PSP or FTP is applied correspondingly. To validate the proposed hybrid approach, we develop a real-time 3D shape measurement system for measuring multiple isolated moving objects. Experimental results demonstrate that our method achieves significantly higher precision and better robustness compared with conventional approaches where PSP or FTP is applied separately.