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

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 s...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2020-03, Vol.20 (7), p.1808
Main Authors: Liu, Yihang, Zhang, Qican, Zhang, Haihua, Wu, Zhoujie, Chen, Wenjing
Format: Article
Language:English
Subjects:
Algorithms
Bandpass filters
Cameras
dynamic scene measurement
Fourier transforms
fringe projection
High speed
high-speed 3-d measurement
Measurement techniques
mechanical projector
Methods
Phase distribution
Phase unwrapping
Projectors
Structured light patterns
temporal fourier transform profilometry (tftp)
Wavelet transforms
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Summary: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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s20071808