Comments for URAPIV = OPEN SOURCE (Matlab or Python or C++) Particle Image Velocimetry (PIV)

Comment on Projects by arindamsingha

arindamsingha — Sat, 24 Nov 2007 21:22:34 +0000

Hi
I am a PhD students working with PIV in University of Windsor, Canada. Unfortunately, for my PIV image processing, I do not use URAPIV, although I got a lot of insight browsing through the codes. But, I have concentrated more on the codes after that. In the last 6 months, I have developed codes for outlier rejection from processed vec files (variable threshold), and POD decomposition-reconstruction (based on the method of snapshots). I would like to involve in the project of URAPIV, with my small capacity. Thanks.

Comment on FAQ by Alex Liberzon

Alex Liberzon — Tue, 14 Aug 2007 15:36:23 +0000

The Subversion now has a branch called July 28 with Region Of Interest support of any size

Comment on FAQ by Alex Liberzon

Alex Liberzon — Mon, 04 Jun 2007 19:36:10 +0000

Of course, all the images we’re working with are rectangular, e.g. 1280 x 1024. If you mean you need a rectangular interrogation window, this is also possible - you simply need the recent version of URAPIV, with GUI, as far as I remember. Otherwise, write us an e-mail, we’ll find the proper version that works with rectangular interrogation windows.

Comment on FAQ by svarela

svarela — Mon, 04 Jun 2007 16:54:07 +0000

I need use rectangulars images but I have problems when use the urapiv, how can I work with rectangular images???

thanks

Comment on FAQ by Alex Liberzon

Alex Liberzon — Fri, 01 Jun 2007 18:34:18 +0000

It depends on what do you call “velocity error”. There are various estimates of error in PIV processing, but it relates to the whole PIV process (e.g. acquisition, storage, image analysis, PIV, etc.) and not so much to the algorithm used. The best test of the software is to take one of the Standard PIV project sets and check against the ‘ground truth’

Alex

Comment on FAQ by svarela

svarela — Fri, 01 Jun 2007 18:05:21 +0000

In need estimates the velocity error and I can’t find the way to do it. In all experiments errors are made, how can I calculate the error inroduce in urapiv??

thanks

Comment on PIV on Google video: by Like-XPIV image from NASA « Alex’s Blog

Like-XPIV image from NASA « Alex’s Blog — Mon, 16 Oct 2006 09:31:11 +0000

[...] Do you remember our XPIV? It’s a simple and reliable technique for the multi-plane stereoscopic PIV measurements. Three parallel laser sheets illuminate the flow field and a single pair of PIV cameras acquire the image of the particles from all the three planes. Some image processing and that’s it. You can see the details here, the video is here and the publication is in Experiments in Fluids, 2004. Why do I tell you this story again? It’s because accidently I found the following image from NASA. More precisely, it is used by MIT Courseware of the course of Compressible Fluid Dynamics, see here [...]

Comment on PIV on Google video: by URAPIV - where Matlab meets Particle Image Velocimetry » Blog Archive » Educational PIV animation on Google video

Tue, 15 Aug 2006 22:52:41 +0000

[...] In addition to the XPIV video clip we uploaded some old animation that was found on one of the NASA sites but unfortunately disappeared from the web. We use it in our courses and it’s very good animation, showing in quite comprehensive way the Particle Image Velocimetry principle. Enjoy. [...]

Comment on Stereoscopic PIV system, Multiphase Flow Laboratory @ Technion by URAPIV - Where Matlab meets PIV (Particle Image Velocimetry) » Blog Archive » Fluid dynamics is physics? not engineering? cool :-)

Wed, 25 Jan 2006 08:31:43 +0000

[...] If you open Physics Today, December 2005 issue, you’ll find out an excellent artcile about Ludwig Prandtl’s Boundary Layer theory by John D Anderson Jr. Turbulent Boundary Layer is a favorite turbulent flow of the URAPIV group (see below the work we’ve done in the turbulent boundary layer flows, or follow the links to the authors, Uri, Roi or Alex) [...]