Results 131 to 140 of about 394 (147)
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Fringe projection profilometry for panoramic 3D reconstruction
Optics and Lasers in Engineering, 2016Abstract In this paper, we introduce a panoramic profilometric system to reconstruct inner cylindrical environments. The system projects circular fringes and uses a temporal phase unwrapping technique. The recovered phase map is used to reconstruct objects placed on the inner cylindrical surface.
César-Cruz Almaraz-Cabral +5 more
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Some practical considerations in fringe projection profilometry
Optics and Lasers in Engineering, 2010As technologies evolve, there have been high demands for the three-dimensional (3D) shape measurement techniques to posses the following combined technical features: high accuracy, fast speed, easy implementation, capability of measuring multiple objects as well as measuring complex shapes.
Zhaoyang Wang +2 more
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Fringe projection profilometry based secured fingerprint sensor
2018 3rd International Conference on Microwave and Photonics (ICMAP), 2018In this paper, we demonstrate the application of fringe projection profilometry (FPP) for secured 3D biometric fingerprint recognition system. For the extraction of texture as well as high frequency information in a practical biometric system simple Fourier filtering methods have been used. We also address the issue of 2D photo and video attacks, which
Puneet Singh +3 more
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Speed sensing using projected fringe profilometry
SPIE Proceedings, 2010An algorithm using fringe projection to perform the speed measurement is described. A fringe pattern is illuminated onto the dynamic object, and a CCD camera is used to record the fringe distribution. Fringes on the obtained image are deformed by the topography of the object, and also, blurred by motion.
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Fringe projection profilometry with portable consumer devices
2017 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 2018A fringe projection profilometry (FPP) using portable consumer devices is attractive because it can realize optical three dimensional (3D) measurement for ordinary consumers in their daily lives. We demonstrate a FPP using a camera in a smart mobile phone and a digital consumer mini projector.
Yuxiang Wu +3 more
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Rapid phase demodulation for projection fringe profilometry
Optik, 2013Abstract To reconstruct 3D shape of large scale object rapidly, a novel phase demodulation approach for sinusoidal projection fringe is proposed. Firstly, a group of computer-generated normal sinusoidal fringe is projected to the reference plane and the measured object respectively, and then the corresponding sinusoidal fringe pattern on the ...
Zhun Zhang +5 more
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Color fringe projection profilometry using geometric constraints
Optics Communications, 2017Abstract A recently proposed phase unwrapping method using geometric constraints performs well without requiring additional camera, more patterns or global search. The major limitation of this technique is the confined measurement depth range (MDR) within 2π in phase domain.
Teng Cheng, Qingyu Du, Yaxi Jiang
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Robotic visual servoing using fringe projection profilometry
Optical Metrology and Inspection for Industrial Applications V, 2018To solve problems including the surface distortion and profile error cannot be considered in robotic off-line programming, and the object parts are often texture-less or even without contour, we propose a new visual servo control method directly using the phase map as the visual features.
Gang Rao, Jing Xu, Zhe Chen
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Learning-based fringe projection profilometry
Optical Measurement Systems for Industrial Inspection XII, 2021openaire +1 more source