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
Citations
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Analogue earthquakes and seismic cycles: experimental modelling across timescales
TL;DR: A review of the development in analogue earthquake modelling with a focus on those seismotectonic scale models that are directly comparable to observational data on short to long timescales can be found in this article.
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The propagation of active-passive interfaces in bacterial swarms
TL;DR: The authors investigate the dynamics of active/passive interfaces in bacterial swarms and find that the boundary can be described as a propagating, diffuse elastic interface.
Journal ArticleDOI
A combined rheometry and imaging study of viscosity reduction in bacterial suspensions
Vincent A. Martinez,Eric Clément,Jochen Arlt,Carine Douarche,Angela Dawson,Jana Schwarz-Linek,Adama Creppy,Viktor Škultéty,Alexander Morozov,Harold Auradou,Wilson C. K. Poon +10 more
TL;DR: This work finds direct evidence that when the viscosity of the bacterial suspension is reduced to near zero, the swimming microbes begin to “swarm” in a way reminiscent of flocking in birds or fish.
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Rectification of Image Velocity Results (RIVeR): A simple and user-friendly toolbox for large scale water surface Particle Image Velocimetry (PIV) and Particle Tracking Velocimetry (PTV)
TL;DR: A methodology based on state-of-the-art tools resulting in large-scale surface-flow characterization according to the first operational version of the RIVeR (Rectification of Image Velocity Results).
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SEGGA: a toolset for rapid automated analysis of epithelial cell polarity and dynamics.
TL;DR: These studies demonstrate that planarPolarity is rapidly established in a spatiotemporally regulated pattern that is dynamically remodeled in response to changes in cell orientation and reveal an unexpected plasticity that maintains coordinated planar polarity in actively moving populations through the continual realignment of cell polarity with the tissue axes.
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.