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Open AccessArticle

Improve Temporal Fourier Transform Profilometry for Complex Dynamic Three-Dimensional Shape Measurement

College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China
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Author to whom correspondence should be addressed.
Sensors 2020, 20(7), 1808; https://doi.org/10.3390/s20071808
Received: 25 February 2020 / Revised: 15 March 2020 / Accepted: 23 March 2020 / Published: 25 March 2020
(This article belongs to the Special Issue Optical and Photonic Sensors)
The high-speed three-dimensional (3-D) shape measurement technique has become more and more popular recently, because of the strong demand for dynamic scene measurement. The single-shot nature of Fourier Transform Profilometry (FTP) makes it highly suitable for the 3-D shape measurement of dynamic scenes. However, due to the band-pass filter, FTP method has limitations for measuring objects with sharp edges, abrupt change or non-uniform reflectivity. In this paper, an improved Temporal Fourier Transform Profilometry (TFTP) algorithm combined with the 3-D phase unwrapping algorithm based on a reference plane is presented, and the measurement of one deformed fringe pattern producing a new 3-D shape of an isolated abrupt objects has been achieved. Improved TFTP method avoids band-pass filter in spatial domain and unwraps 3-D phase distribution along the temporal axis based on the reference plane. The high-frequency information of the measured object can be well preserved, and each pixel is processed separately. Experiments verify that our method can be well applied to a dynamic 3-D shape measurement with isolated, sharp edges or abrupt change. A high-speed and low-cost structured light pattern sequence projection has also been presented, it is capable of projection frequencies in the kHz level. Using the proposed 3-D shape measurement algorithm with the self-made mechanical projector, we demonstrated dynamic 3-D reconstruction with a rate of 297 Hz, which is mainly limited by the speed of the camera. View Full-Text
Keywords: high-speed 3-D measurement; dynamic scene measurement; fringe projection; mechanical projector; Temporal Fourier Transform Profilometry (TFTP); phase unwrapping high-speed 3-D measurement; dynamic scene measurement; fringe projection; mechanical projector; Temporal Fourier Transform Profilometry (TFTP); phase unwrapping
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Liu, Y.; Zhang, Q.; Zhang, H.; Wu, Z.; Chen, W. Improve Temporal Fourier Transform Profilometry for Complex Dynamic Three-Dimensional Shape Measurement. Sensors 2020, 20, 1808.

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