New version - major beta release is on its way

We added so much functionality during the last weekend sprint on URAPIV_GUI:

1. due to a request of our users at the University of Ben Gurion, Beer Sheva, Israel, we added an option to read MetaMorph TIFF images, using the tiffread function of Francois Nedelec, EMBL, Copyright 1999-2006. [http://www.cytosim.org/other/tiffread.m]
2. we added an option to use RECTANGULAR interrogation windows (64 x 16 pixels, etc.)
3. we added Select Region-of-Interest and Reset Region-of-Interest - smaller windows are available for quick-n-dirty check of your images
4. we added an option (to GUI, lost functionality due to transfer to ETH format of high-speed PIV) to read images named as:
   • bird001a.tif - bird001b.tif
   • bird001_b.tif - bird001_c.tif
   • bird001.tif, bird002.tif, bird00x.tif
5. New look:

 

(press to see the full image)

.:: January 05, 2008 ::.

New Wiki on the Sourceforge.net

Don’t worry, we will not drop the WordPress blog (which is great) and we like it a lot, but since Sourceforge.net are also progressing, we have added two major features:

1. Subversion control (finally :-))

http://matlabpiv.svn.sourceforge.net/viewvc/matlabpiv/

2. Wiki

http://matlabpiv.wiki.sourceforge.net/Getting+started 

Enjoy it

Note the updated links on the right >>>

Note that we’ve updated the links to the personal websites of the group members.

Sorry for inactivity

Dear users of URAPIV, PyPIV and just readers. We apologize for inactivity, but it is simply due to time constraints. Those of you who wrote an email noticed that we:

a) replied within a day or two

b) helped with any problem you had

c) supported your downloading/running/evaluating problems

The blog inactivity for you means only one things - it’s good - we get too many questions, e-mails and downloading counter is crunching almost every day

We got downloads from Argonne National Laboratory, Penn State, Michigan, Georgia Tech and so on and so on. Not mentioning that Tel Aviv University is now overwhelmed by PIV applicatons and URAPIV is one of the main tools there

What do you say abou this logo for the URAPIV project?

URAPIV in dusty plasmas (including the tutorial)

The story started from one e-mail:

I would like PIV to evaluate some of my video data. In search of a solution, I have found your tool, URAPIV. I have downloaded URAPIV_GUI_TIFF (Release Date September 20, 2004) from sourceforge.net.Unfortunately, I am running into a few problems. First, I am only able to read in 4 images at a time. In addition, the code only seems to work if the images that are included with the URAPIV_GUI_TIFF download are included in the directory containing the images that I would like to analyze.

Do you have any ideas on how to have the software read in all of the images? Also, is there a manual for this software?

Many thanks and best greetings.

Jeremiah Williams

So, we answered (as usual), suggesting to take a first look at the images and to reproduce the problem (that sometimes happen simply due to Matlab version, compatability issues, etc.) and got a sample of 10 frame AVI file. Since it was not our first time to get the AVI files, we decided to take a step and slightly adopted the URAPIV code for reading and working with AVI files. The technical details are in the Tutorial. Here we’d like to tell you the story behind the images. Our users come from the well known (in plasma physics and beyond it) lab from Auburn University:

Particularly, we have found the old-dated pages about PIV analysis in dusty (or complex) plasma, e.g.

The lab knows about 2D PIV for a long time, as one can see from the short intro to PIV on their web site:

And it’s an honour for the URAPIV project to be helpful in this research. The output of our short customized solution is an updated URAPIV_AVI version (that’s recently has been uploaded to the sourceforge.net) and the example looks like:

Read more about the technical stuff on the Tutorial page.

The proper credit should be as the author says:

The video comes from the Colloidal (Dusty) Plasmas research group at the Institute of Physics, University Greifswald, Germany. The video was shot by Matthias Wolter, who has been visiting our lab for the past couple of months, during the 8th DLR parabolic flight campaign. In the video, a plasma crystal under microgravity conditions was manipulated by a 600 mW laser.
You can find additional information on the type of work that he does at his groups web page (http://www5.physik.uni-greifswald.de/).
The PIV aspect of this work comes from work done at our group, the Plasma Sciences Laboratory at Auburn University. We have applied PIV techniques to the study of complex (dusty) plasmas for a number of years and have two commercial PIV systems (a 2D system from TSI and a stereo system from LaVision). Additional information on this can be found at our group’s web page, http://narn.physics.auburn.edu.

With kind regards,
Jeremiah Williams

URAPIV for cars?

The researchers from the International Automotive Research Centre at the Warwick University has asked if URAPIV can perform on the images like the example above. The original images are typical gray scale images, but taken with a camera that also moves. Therefore, the motion is a superposition of the motion of cars (note the direction of the middle jeep) and of the "optical flow" because of the camera shift. Anyhow, it was an interesting challenge and we were happy with the preliminary result. For this purpose we also updated URAPIV with a version for Matlab R14SP2 (R14 is ver 7) that reads TIFF, JPG, BMP or all other formats that IMREAD function of Matlab can read. The names are like from a high-speed camera (sometimes called time resolved PIV or high frame rate PIV, etc.) and we analyze 1st with the 2nd, 2nd with the 3rd, and so on.

The strange image is an overlay of the two images in one RGB image, when the first one is the red layer (R) and the second image is the blue layer (B). Arrows are green, respectively. The magenta is all the regions that didn't change and the differences are seen between the images where the color is blue or red. In Matlab we do it like this:

>> imshow(cat(3,a,a*0,b)); % a/b are the first/second image  

Don't hesitate to ask for the most recent version by e-mail, we are always glad to see URAPIV that helps to resolve different problems.

THE question: how to make money from open source scientific software?

Open Science Blog asks very good questions: how to make money from open source scientific software? Do you have an answer? write me a private e-mail, don't comment in public

http://www.openscience.org/blog/?p=164

Oh, our answer is:

1. Dual licensing (ask us about the license for URAPIV or PyPIV)

2. Sell services - the name of our consulting company is a secret, but you can ask for a price quote :-) 

“Cloud Dancer” compiles PIV literature

Cloud Dancer (that’s the blog name of Jichul Kim) compiles some literature survey on PIV and related topics. Interesting. We can only suggest to include our work in Exp. Fluids on PIV and IR or XPIV, etc.

The copy of the list is:

PIV measurements of a microchannel flow
CD
Meinhart, ST Wereley, JG Santiago - Experiments in Fluids, 1999 -
springerlink.com This work is supported by AFOSR/DARPA
F49620-97-1-0515, under the direction of Dr. Tom Beutner and Dr. Al
Pisano, by DARPA F33615-98-1-2853 under the … Cited by 118 - Web Search - widget.ecn.purdue.edu - ecf.utoronto.ca - fluid.me.pusan.ac.kr - all 8 versions » - UC-eLinks

A particle image velocimetry system for microfluidics
JG
Santiago, ST Wereley, CD Meinhart, DJ Beebe, RJ … - Experiments in
Fluids, 1998 - springerlink.com JG Santiago, DJ Beebe Department of
Electrical and Computer Engineering, Beckman Institute for Advanced
Science and Technology, 4265 Beckman Institute, … Cited by 110 - Web Search - microfluidics.stanford.edu - engineering.ucsb.edu - widget.ecn.purdue.edu - all 9 versions » - UC-eLinks

Cross-correlation analysis for temperature measurement
V
Hohreiter, ST Wereley, MG Olsen, JN Chung - Measurement Science and
Technology, 2002 - iop.org Page 1. I NSTITUTE OF P HYSICS P UBLISHING M
EASUREMENT S CIENCE AND T ECHNOLOGYMeas. Sci. Technol. 13 (2002)
1072–1078 PII: S0957-0233(02)31547-9 … Cited by 7 - Web Search - microfluidics.stanford.edu - widget.ecn.purdue.edu - adsabs.harvard.edu - all 7 versions » - UC-eLinks

Particle imaging techniques for microfabricated fluidic systems
S
Devasenathipathy, JG Santiago, ST Wereley, CD … - Experiments in
Fluids, 2003 - springerlink.com Page 1. Particle imaging techniques for
microfabricated fluidic systems S.Devasenathipathy, JG Santiago, ST
Wereley, CD Meinhart, K. Takehara … Cited by 17 - Web Search - engineering.ucsb.edu - microfluidics.stanford.edu - adsabs.harvard.edu

Out-of-plane motion effects in microscopic particle image velocimetry.
MG
Olsen, CJ Bourdon - Journal of Fluids Engineering(Transactions of the
ASME), 2003 - csa.com Out-of-plane motion effects in microscopic
particle image velocimetry. MG Olsen,CJ Bourdon Journal of Fluids
Engineering(Transactions of the ASME) 125:5 pp. … Cited by 7 - Web Search - UC-eLinks

Validation of an analytical solution for depth of correlation in microscopic particle image …CJ
Bourdon, MG Olsen, AD Gorby - Measurement Science and Technology, 2004
- iop.org Page 1. I NSTITUTE OF P HYSICS P UBLISHING M EASUREMENT S
CIENCE AND T ECHNOLOGYMeas. Sci. Technol. 15 (2004) 318–327 PII:
S0957-0233(04)68454-2 … Cited by 6 - Web Search - iop.org - ingentaconnect.com - csa.com - all 5 versions » - UC-eLinks

Micron-Resolution Particle Image Velocimetry
ST
Wereley, CD Meinhart - 2004 - engineering.ucsb.edu Page 1. 1
Micron-Resolution Particle Image Velocimetry Steven T. WereleySchool of
Mechanical Engineering Purdue University Carl … Cited by 4 - View as HTML - Web Search - microfluidics.stanford.edu - adsabs.harvard.edu - link.aip.org

Microscale flow visualization
D
Sinton - Microfluidics and Nanofluidics, 2004 - springerlink.com Page
1. REVIEW D. Sinton Microscale flow visualization Received: 4 July 2004
/ Accepted:10 July 2004 / Published online: 19 August 2004 Ó
Springer-Verlag 2004 … Cited by 3 - Web Search - me.uvic.ca - UC-eLinks

Simultaneous, Spatially-Resolved Temperature and Velocity Measurements Using Cross-Correlation PIV
ST
Wereley, VP Hohreiter - paper, 2002 - in3.dem.ist.utl.pt Page 1.
Simultaneous, Spatially-Resolved Temperature and Velocity Measurements
UsingCross-Correlation PIV by ST Wereley (1) and VP Hohreiter (2) … Cited by 1 - View as HTML - Web Search

STACKED MICROCHANNEL HEAT SINKS FOR LIQUID COOLING OF MICROELECTRONICS DEVICES
CP
Wong, P Hesketh, B Frazier, A Fedorov - smartech.gatech.edu Page 1.
STACKED MICROCHANNEL HEAT SINKS FOR LIQUID COOLING OF MICROELECTRONICS
DEVICESA Dissertation Presented to the Academic Faculty by Xiaojin Wei
… View as HTML - Web Search - etd.gatech.edu

GPIV has a new release

If you're looking for completely free solution for your PIV needs and you're not satisfied with our URAPIV or PyPIV projects, you can download GPIV - GPL, ANSI-C package (also on the Sourceforge.net) with acquisition, analysis, all in one package. Good work: