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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Theory of cross-correlation analysis of PIV images : Image analysis as measuring technique in flows
R. D. Keane,R. J. Adrian +1 more
TL;DR: In this article, cross-correlation methods of interrogation of successive single-exposure frames can be used to measure the separation of pairs of particle images between successive frames, which can be optimized in terms of spatial resolution, detection rate, accuracy and reliability.
Journal ArticleDOI
A four-organ-chip for interconnected long-term co-culture of human intestine, liver, skin and kidney equivalents
Ilka Maschmeyer,Alexandra Lorenz,Katharina Schimek,Tobias Hasenberg,Anja Patricia Ramme,Juliane Hübner,Marcus Lindner,Christopher Drewell,Sophie Bauer,Alexander Thomas,Naomia Sisoli Sambo,Frank Sonntag,Roland Lauster,Uwe Marx +13 more
TL;DR: This study is the first approach to establish a system for in vitro microfluidic ADME profiling and repeated dose systemic toxicity testing of drug candidates over 28 days in co-culture, and assures near to physiological fluid-to-tissue ratios.
Journal ArticleDOI
Topological defects in epithelia govern cell death and extrusion.
Thuan Beng Saw,Amin Doostmohammadi,Vincent Nier,Leyla Kocgozlu,Sumesh P. Thampi,Sumesh P. Thampi,Yusuke Toyama,Philippe Marcq,Chwee Teck Lim,Julia M. Yeomans,Benoit Ladoux +10 more
TL;DR: A mechanism for apoptotic cell extrusion is proposed: spontaneously formed topological defects in epithelia govern cell fate, and the ability to control extrusion hotspots by geometrically inducing defects through microcontact printing of patterned monolayers is demonstrated.
Journal ArticleDOI
Phototactic guidance of a tissue-engineered soft-robotic ray.
Sung-Jin Park,Mattia Gazzola,Kyung Soo Park,Shirley Park,Valentina Di Santo,Erin L. Blevins,Johan Ulrik Lind,Patrick H. Campbell,Stephanie Dauth,Andrew K. Capulli,Francesco S. Pasqualini,Seungkuk Ahn,Alexander Cho,Hongyan Yuan,Ben M. Maoz,Ragu Vijaykumar,Jeong-Woo Choi,Karl Deisseroth,Karl Deisseroth,George V. Lauder,Lakshminarayanan Mahadevan,Lakshminarayanan Mahadevan,Kevin Kit Parker,Kevin Kit Parker +23 more
TL;DR: In this article, a tissue-engineered ray was constructed from rat cardiomyocytes on an elastomeric body enclosing a microfabricated gold skeleton to mimic the fin deflection patterns of batoid fish.
Journal Article
Phototactic guidance of a tissue-engineered soft-robotic ray.
Sung-Jin Park,Mattia Gazzola,Kyung Soo Park,Shirley Park,Valentina Di Santo,Karl Deisseroth,George V. Lauder,Lakshminarayanan Mahadevan,Kevin Kit Parker +8 more
TL;DR: Inspired by the relatively simple morphological blueprint provided by batoid fish such as stingrays and skates, a biohybrid system that enables an artificial animal—a tissue-engineered ray—to swim and phototactically follow a light cue is created.
References
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Robust smoothing of gridded data in one and higher dimensions with missing values
TL;DR: The proposed algorithm - very fast, automatic, robust and requiring low storage -provides an efficient smoother for numerous applications in the area of data analysis.
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Optimization of particle image velocimeters. I, Double pulsed systems
TL;DR: In this paper, a set of six non-dimensional parameters that are the most significant in optimizing particle image velocimeter performance are identified, which are the data validation criterion, the particle image density, the relative in-plane image displacement, a velocity gradient parameter, and the ratio of the mean image diameter to the interrogation spot diameter.
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Advances in iterative multigrid PIV image processing
TL;DR: An image-processing technique that performs iterative interrogation of particle image velocimetry (PIV) recordings based on cross-correlation enhances the matching performances by means of a relative transformation between the interrogation areas, showing that a remarkable improvement can be obtained in terms of precision and dynamic range.
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The effect of a discrete window offset on the accuracy of cross-correlation analysis of digital PIV recordings
TL;DR: In this article, the location of the displacement-correlation peak in PIV images is optimized by the use of a window offset equal to the integer-pixel displacement, and the effect is predicted by an analytical model for the statistical properties of estimators for the displacement.
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Iterative multigrid approach in PIV image processing with discrete window offset
TL;DR: The improved cross-correlation algorithm has been applied to the measurement of the turbulent flow past a backward facing step (BFS) and a systematic comparison is presented with Direct Numerical Simulation data available on the subject.