Journal ArticleDOI
Pulse-width modulation in defocused three-dimensional fringe projection.
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TLDR
This work presents a sinusoidal fringe generation technique that utilizes slightly defocused binary fringe projection, a spatial version of the well-known pulse-width modulation (PWM) technique of electrical engineering that allows it to overcome the gamma problem in the output light intensity.Abstract:
Shape measurements by fringe projection methods require high-quality sinusoidal fringes. We present a sinusoidal fringe generation technique that utilizes slightly defocused binary fringe projection. The proposed method is a spatial version of the well-known pulse-width modulation (PWM) technique of electrical engineering. PWM is easy to implement using off-the-shelf projectors, and it allows us to overcome the gamma problem (i.e., the nonlinear projector response) in the output light intensity. We will demonstrate that, with a small defocusing level--lower than with other techniques proposed in the literature--a high-quality sinusoidal pattern is obtained. Validation experiments using a commercial video projector are presented.read more
Citations
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Journal ArticleDOI
Phase shifting algorithms for fringe projection profilometry: A review
TL;DR: An overview of state-of-the-art phase shifting algorithms for implementing 3D surface profilometry is presented to provide a useful guide to the selection of the most appropriate phase shifting technique for a particular application.
Journal ArticleDOI
High-speed 3D shape measurement with structured light methods: A review
TL;DR: The fundamental principles behind the primary state-of-the-art 3D shape measurement techniques based on structured light methods will be elucidated, experimental results will be presented to demonstrate capabilities and/or limitations for those popular techniques, and perspectives on those remaining challenges to be conquered to make advanced 3Dshape measurement techniques ubiquitous are presented.
Journal ArticleDOI
High-speed three-dimensional shape measurement for dynamic scenes using bi-frequency tripolar pulse-width-modulation fringe projection
Chao Zuo,Chao Zuo,Qian Chen,Qian Chen,Guohua Gu,Shijie Feng,Fangxiaoyu Feng,Rubin Li,Guochen Shen +8 more
TL;DR: A high-speed three-dimensional shape measurement technique for dynamic scenes by using bi-frequency tripolar pulse-width-modulation (TPWM) fringe projection to generate ideal fringe patterns with slight defocus is introduced.
Journal ArticleDOI
Microscopic fringe projection profilometry: A review
TL;DR: An overview of these state-of-the-art MFPP works is presented by analyzing and comparing the measurement principles, systems structures, and key performance indexes such as the accuracy, field of view (FOV), and speed.
Journal ArticleDOI
Three-dimensional shape measurement with binary dithered patterns.
Yajun Wang,Song Zhang +1 more
TL;DR: Both simulation and experimental results show the phase error is always less than 0.6% even when the fringe stripes are wide and the projector is nearly focused, so the binary dithering technique can be used to conquer this challenge.
References
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Journal ArticleDOI
High-speed 3-D shape measurement based on digital fringe projection
TL;DR: Experimental results demonstrated the feasibility of this technique for high-speed 3-D shape measurement with a potential measurement speed up to 100 Hz.
Journal ArticleDOI
Flexible 3-D shape measurement using projector defocusing
Shuangyan Lei,Song Zhang +1 more
TL;DR: This technique does not require calibration of the gamma of the projector, it is easy to implement and thus is promising for developing flexible 3-D shape measurement systems using digital video projectors.
Journal ArticleDOI
Phase error analysis and compensation for nonsinusoidal waveforms in phase-shifting digital fringe projection profilometry
TL;DR: A novel and simple iterative phase compensation algorithm is proposed to compensate the nonsinusoidal phase error and experiments show that the proposed algorithm can be used for effective phase error compensation in practical phase-shifting FPP.
Journal ArticleDOI
Gamma correction for digital fringe projection profilometry.
TL;DR: This work proposes a gamma-correction technique based on statistical analysis of the fringe images that allows one to estimate the value of gamma from the normalized cumulative histogram of theringe images, and shows how this technique can be applied to digital fringe projection profilometry.
Journal ArticleDOI
Generic nonsinusoidal phase error correction for three-dimensional shape measurement using a digital video projector
Song Zhang,Shing-Tung Yau +1 more
TL;DR: It is proved that this algorithm is generic for any phase-shifting algorithm, and a new LUT generation method is proposed by analyzing the captured fringe image of a flat board directly, which can reduce the phase error to at least 13 times smaller.