PIVlab – Towards User-friendly, Affordable and Accurate Digital Particle Image Velocimetry in MATLAB
William Thielicke,Eize Stamhuis +1 more
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TLDR
The accuracy of several algorithms was determined and the best performing methods were implemented in a user-friendly open-source tool for performing DPIV flow analysis in Matlab.Abstract:
Digital particle image velocimetry (DPIV) is a non-intrusive analysis technique that is very popular for mapping flows quantitatively. To get accurate results, in particular in complex flow fields, a number of challenges have to be faced and solved: The quality of the flow measurements is affected by computational details such as image pre-conditioning, sub-pixel peak estimators, data validation procedures, interpolation algorithms and smoothing methods. The accuracy of several algorithms was determined and the best performing methods were implemented in a user-friendly open-source tool for performing DPIV flow analysis in Matlab.read more
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“Use of 3D Point Clouds in Geohazards” Special Issue: Current Challenges and Future Trends
TL;DR: The fast proliferation of new satellite, aerial and terrestrial remote sensing techniques has undoubtedly provided new technological and scientific opportunities to society during the last few decades.
Journal ArticleDOI
Coral larvae are poor swimmers and require fine-scale reef structure to settle
Tom Hata,Joshua S. Madin,Vivian R. Cumbo,Mark W. Denny,Joana Figueiredo,Saki Harii,Christopher Thomas,Andrew H. Baird +7 more
TL;DR: It is shown experimentally that turbulence generated by fine scale structure is required to deliver larvae to the substratum even in conditions mimicking calm back-reef flow environments, which indicates structural complexity at a number of scales assists coral recovery.
Journal ArticleDOI
Coupling of turbulent and non-turbulent flow regimes within pyroclastic density currents
E. C. P. Breard,Gert Lube,Jim R. Jones,Josef Dufek,Shane J. Cronin,Greg A. Valentine,Anja Moebis +6 more
TL;DR: In this paper, the authors present a quantitative view inside pyroclastic density currents by synthesizing their natural flow behavior in large-scale experiments, and show that the underflow and ash-cloud regions are dynamically coupled through a zone of intermediate turbulence.
Journal ArticleDOI
An Evaluation of Image Velocimetry Techniques under Low Flow Conditions and High Seeding Densities Using Unmanned Aerial Systems
Sophie Pearce,Robert Ljubičić,Salvador Peña-Haro,Matthew T. Perks,Flavia Tauro,Alonso Pizarro,Silvano Fortunato Dal Sasso,Dariia Strelnikova,Salvatore Grimaldi,Ian Maddock,Gernot Paulus,Jasna Plavšić,Dušan Prodanović,Salvatore Manfreda +13 more
TL;DR: In this paper, a sensitivity analysis has been conducted on five different image velocimetry algorithms including Large Scale Particle Image Velocimetric (LSPIV), Large-Scale Particle Tracking Velocimenter(LSPTV), KLT-IV, OTV, and SSIV for monitoring river flows using remotely operated platforms such as UAS.
Journal ArticleDOI
On the Quantification of Cellular Velocity Fields
TL;DR: Although optical flow is not as common, a relatively simple implementation of this method can outperform PIV and is easily augmented to extract additional biophysical/chemical information such as local vorticity or net polymerization rates from speckle microscopy.
References
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The Design and Implementation of FFTW3
Matteo Frigo,Steven G. Johnson +1 more
TL;DR: It is shown that such an approach can yield an implementation of the discrete Fourier transform that is competitive with hand-optimized libraries, and the software structure that makes the current FFTW3 version flexible and adaptive is described.
Book
Particle Image Velocimetry: A Practical Guide
TL;DR: In this paper, the authors present a practical guide for the planning, performance and understanding of experiments employing the PIV technique, which is primarily intended for engineers, scientists and students, who already have some basic knowledge of fluid mechanics and nonintrusive optical measurement techniques.
Journal ArticleDOI
Particle-Imaging Techniques for Experimental Fluid Mechanics
TL;DR: A review of these methods can be found in articles by Lauterborn & Vogel (1984), Adrian (1986a), Hesselink (1988), and Dudderar et al..
Journal ArticleDOI
Adaptive histogram equalization and its variations
Stephen M. Pizer,Stephen M. Pizer,E. Philip Amburn,E. Philip Amburn,John D. Austin,Robert Cromartie,Ari Geselowitz,Ari Geselowitz,Trey Greer,Bart M. ter Haar Romeny,John B. Zimmerman,John B. Zimmerman +11 more
TL;DR: It is concluded that clipped ahe should become a method of choice in medical imaging and probably also in other areas of digital imaging, and that clip ahe can be made adequately fast to be routinely applied in the normal display sequence.
Journal ArticleDOI
Digital Particle Image Velocimetry
Christian Willert,Morteza Gharib +1 more
TL;DR: In this article, the directional ambiguity associated with PIV and LSV is resolved by implementing local spatial cross-correlations between two sequential single-exposed particle images, and the recovered velocity data are used to compute the spatial and temporal vorticity distribution and the circulation of the vortex ring.