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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Journal ArticleDOI
Consolidation deformation of hydrate-bearing sediments: A pore-scale computed tomography investigation
TL;DR: In this article, the microstructural behavior of hydrate-bearing sediment during consolidation remains unclear because of experimental challenges; however, using a novel microfocus X-ray CT-based triaxial testing apparatus, the authors present a series of results to reveal the micro-structural evolution of sediment using the pixel-tracking technique at the submillimeter level.
Journal ArticleDOI
Performance augmentation mechanism of tandem flapping foils with stroke time-asymmetry
TL;DR: In this paper, the performance augmentation mechanism of a tandem-foil system undergoing time-asymmetric flapping with unequal up-and downstroke durations (velocities) is investigated at three different phase angles, 0°, 90°, and 180°.
Dissertation
Détection de vapeurs d'atomes métalliques par fluorescence induite par laser (LIF) : application à la propulsion solide
TL;DR: In this paper, the authors propose a modele theorique du processus de fluorescence applique a ces de two atomes metalliques (Al and Fe) utilises comme traceurs fluorescents dans les flammes de propergols solides or ils sont naturellement presents.
Journal ArticleDOI
OpenOpticalFlow_PIV: An Open Source Program Integrating Optical Flow Method with Cross-Correlation Method for Particle Image Velocimetry
Tianshu Liu,David M. Salazar +1 more
TL;DR: OpenOpticalFlow_PIV as mentioned in this paper is an open source Matlab program integrating the optical flow method with the cross-correlation method for extraction of high-resolution velocity fields from particle images with large displacements.
Posted ContentDOI
Image velocimetry and spectral analysis enable quantitative characterization of larval zebrafish gut motility
Julia Ganz,Ryan P. Baker,M. Kristina Hamilton,Ellie Melancon,Parham Diba,Judith S. Eisen,Raghuveer Parthasarathy +6 more
TL;DR: A new image analysis method based on image velocimetry and spectral analysis that reveals temporal characteristics such as frequency and wave propagation speed, while also providing quantitative measures of the amplitude of gut motions is developed.
References
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Journal ArticleDOI
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.