Journal ArticleDOI
High-speed pattern projection for three-dimensional shape measurement using laser speckles
TLDR
A high-speed projection system that is able to project statistical speckle patterns at a rate of 500Hz to generate structured light for a real-time photogrammetry stereo vision setup and compares it with widely used stripe projection methods, qualitatively and quantitatively.Abstract:
We propose a high-speed projection system that is able to project statistical speckle patterns at a rate of 500Hz. Its purpose is to generate structured light for a real-time photogrammetry stereo vision setup. As conventional digital light projector (DLP) projection setups are limited in their maximum projection rate to 250Hz for gray-value patterns, stripe projection systems are usually applied for real-time three-dimensional (3D) measurements. However, these techniques can only be used on steady surfaces as phase unwrapping has to be done. In contrast, the proposed setup is able to measure the shape of multiple spatially separated objects at once. We compare the speckle setup with a system using a DLP projector and with other fast 3D shape measurement setups, like the widely used stripe projection methods, qualitatively and quantitatively.read more
Citations
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Journal ArticleDOI
Superfast multifrequency phase-shifting technique with optimal pulse width modulation.
Yajun Wang,Song Zhang +1 more
TL;DR: A 556 Hz system utilizing a three-frequency algorithm for simultaneously measuring multiple objects and an optimal pulse width modulation (OPWM) technique that can selectively eliminate high-order harmonics of squared binary patterns are developed.
Journal ArticleDOI
High-speed three-dimensional shape measurement using GOBO projection
Stefan Heist,Stefan Heist,Peter Lutzke,Ingo Schmidt,Patrick Dietrich,Patrick Dietrich,Peter Kühmstedt,Andreas Tünnermann,Andreas Tünnermann,Gunther Notni,Gunther Notni +10 more
TL;DR: In this article, a rotating slide structure is used to project a periodic sinusoidal fringe pattern at high frame rates and with high radiant flux, which is used in an optical 3D sensor based on coded-light projection, thus allowing the analysis of fast processes.
Journal ArticleDOI
Array projection of aperiodic sinusoidal fringes for high-speed three-dimensional shape measurement
TL;DR: In this article, an array projector that projects aperiodic sinusoidal fringes with spatially and temporally varying offset, amplitude, period length, and phase shift is used for 3D shape measurements.
Journal ArticleDOI
High-speed three-dimensional shape measurements of objects with laser speckles and acousto-optical deflection
TL;DR: This work presents this uncommon but potential approach for highspeed (≈250 3Dfps= [3D measurements per second]), dense, and accurate 3D measurements of spatially separated objects and shows the media that emphasizes the ability of accurate measurements while the objects under testing move.
Journal ArticleDOI
Single shot laser speckle based 3D acquisition system for medical applications
TL;DR: A single shot 3D measurement system is presented that extracts the 3D point cloud of human skin by projecting a laser speckle pattern using a single pair of images captured by two synchronized cameras and employs KLT tracking method to locate the corresponding points.
References
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A flexible new technique for camera calibration
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Journal ArticleDOI
Fourier transform profilometry for the automatic measurement of 3-D object shapes
Mitsuo Takeda,Kazuhiro Mutoh +1 more
TL;DR: A new computer-based technique for automatic 3-D shape measurement is proposed and verified by experiments that has a much higher sensitivity than the conventional moire technique and is capable of fully automatic distinction between a depression and an elevation on the object surface.
Journal ArticleDOI
In defense of the eight-point algorithm
TL;DR: This paper shows that by preceding the eight-point algorithm with a very simple normalization (translation and scaling) of the coordinates of the matched points, results are obtained comparable with the best iterative algorithms.
Fast Normalized Cross-Correlation
TL;DR: This short paper shows that unnormalized cross correlation can be efficiently normalized using precomputing integrals of the image and image over the search window.
Journal ArticleDOI
Recent progresses on real-time 3D shape measurement using digital fringe projection techniques
TL;DR: The principles of the real-time 3D shape measurement techniques that were developed are presented, the most recent progresses that have been made in this field are summarized, and the challenges for advancing this technology further are discussed.