Abstract
A novel high-speed 3D shape measurement technology called temporal Fourier transform profilometry (TFTP for short) is proposed by combining the merits of Fourier transform profilometry (FTP) and phase-measuring profilometry (PMP). Instead of using the digital light projector, a mechanical projector is employed to generate multi-period phase-shifting fringe patterns sequentially. During the reconstruction process, the phase value of each pixel is calculated independently along the temporal axis and no spectrum filtering operation is performed in a spatial domain. Therefore, high-frequency components containing the detailed information of the measured object effectively remain. The proposed method is suitable for measuring isolated dynamic objects. Only one frame of deformed fringe pattern is required to retrieve one 3D shape of the measured object, so it has the obvious advantage if measuring the dynamic scene at a high speed. A low-cost self-made mechanical projector with fast projection speed is developed to execute the principle-proof experiments, whose results demonstrate the feasibility of measuring isolated dynamic objects.
Highlights
Due to its advantages of non-contact measurement, high speed and high accuracy, opticalSeveral profilometry methods based on structured light projection have been extensively studied.The two most representative technologies are phase-measuring profilometry (PMP) and Fourier transform profilometry (FTP)
To solve the initial phase of the measured object, spatial information of full-field phase-shifting fringe patterns and temporal information in a period are obtained by scanning along the temporal axis
To ensure temporal resolution and lasted, the appropriate sampling of the high-speed camera was selected to measuring capture as accuracy, multiple periodic signals were constructed to analyze the phase variation along the many frames of deformed fringe patterns as possible
Summary
Due to its advantages of non-contact measurement, high speed and high accuracy, optical. Patrick et al achieved a binary pattern projection at the rate of 200 Hz. system error corrections were required to obtain accurate phase shift and the fringe pattern could not be flexibly changed. System error corrections were required to obtain accurate phase shift and the fringe pattern could not be flexibly changed It was limited by machining accuracy and synchronized control. Before Optics (GOBO) projector with high-power and high-speed projection [10] They achieved a high radiant flux of 250 W, and a 3D frame of 1333 Hz. While, the GOBO wheel’s exact rotational position was unknown, two cameras were required for 3D measurement. By projecting and recording the multi-period phase-shifting fringe, this proposed method performs fast Fourier transform (FFT), spectrum filtering and inverse FFT operations along the temporal axis to calculate the wrapped phase value. The proposed method and a developed system were applied to measure the multiple isolated moving objects and experiments verified the performance of this TFTP method
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