1.1 General description
Gpiv (Figure 1.1) is a program to record and
interrogating images for Particle Image
Velocimetry (PIV). It also includes algorithms for validation of
the PIV estimators and post-processing that result into derived
(scalar) flow quantities. It gives an overview of the parameters in a
logical and organized way, allows to run the processes individually or
in a pipeline process and visualizes the results. Gpiv displays the
images, interrogation area's, piv estimators, outliers, excessive
velocity gradients and post processing results in a single window
frame. The resulting estimator values may be displayed interactively. The
graphical user interface of Gpiv has been written with the GTK/GNOME
Gpiv is one of the end-user programs that makes extensively use of Libgpiv. Libgpiv includes the main algorithms for interrogation, validation, post-processing, memory (de)allocation, in-and output handling, etc. Other end-user programs may be found in the Gpivtools package. Gpivtools contains command line programs that may be invoked from a shell or from scripts. Some PERL scripts are found in the Gpivtools package, as well. All codes have been written in ANSI-C and have been developed on a LINUX box.
Figure 1.1 Screenshot of Gpiv with PIV estimators (vectors) from an artificial, computer generated image pair  and the derived vorticity field (background color)
Gpiv is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
1.3 Final remarks
I kindly ask to acknowledge the use of the software in articles, reports etc. in case the software has considerably contributed to the work presented. I hope you'll enjoy Gpiv. Suggestions for improvements and additions are welcome.
Gerber van der Graaf
 Okamoto, K., Nishio, S., Saga, T. and Kobayashi, T., 2000, "Standard images
for particle-image velocimetry," Meas. Sci. Technol., 11, 685-691.