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   8 <A NAME="intro.html"> <H1>Introduction </H1></A>
   9
  10 <a name="1"> <H2>1.1 General description</H2></A>
  11
  12 GPIV (<a href="#fig1">Figure 1.1</A>) is a program that performs
  13 Particle Image Velocimetry (PIV) interrogations on a (pair of)
  14 images. A short explanation about PIV and related techniques is given
  15 in <a href="piv_intro.html">Chapter 3</A>. It also includes validation
  16 of the estimators and post-processing on the PIV data that result into
  17 derived (scalar) flow quantities. It is meant to have a quick overview
  18 of the parameters of all piv processes, to change them easely, to run
  19 the processes and visualizing their results in an interactive way. It
  20 visualizes interrogation area's, piv estimators, outliers, velocity
  21 gradients over the interrogation area's and post processing results in
  22 a single window frame. The graphical user interface of GPIV has been
  23 written with the GTK/GNOME libraries. Currently, the images itself can
  24 not be visualized, yet.
  25 <P>
  26
  27 Actually, GPIV is one of the end-user programs that makes extensively
  28 use of libgpiv. Libgpiv includes the main algorithms for
  29 interrogation, validation, post-processing, memory (de)allocation,
  30 in-and output handling, etc. Other end-user programs may be found in
  31 the gpivtools distribution. Gpivtools contains command line programs
  32 that may be invoked from a shell or from scripts. Some example
  33 scripts, written in PERL can be found in the gpivtools distrib, as
  34 well. All codes have been written in ANSI-C and have been developed on
  35 a LINUX box.
  36 <P>
  37 <P>
  38
  39 <IMG SRC = "figures/gpiv-fig1.png"> <br>
  40 <A NAME="fig1" id="gpiv-fig1">Figure 1.1 Screenshot of GPIV with PIV estimators
  41 (vectors) from an artificial, computer generated image pair [1]and the derived
  42 vorticity field (background color) </A>
  43 <P>
  44
  45 <a name="2"> <H2>1.2 License </H2></A>
  46 Gpiv is free software; you can redistribute it and/or modify it under
  47 the terms of the GNU General Public License as published by the Free
  48 Software Foundation; either version 2, or (at your option) any later
  49 version.
  50 <P>
  51 This program is distributed in the hope that it will be useful, but
  52 WITHOUT ANY WARRANTY; without even the implied warranty of
  53 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  54 General Public License for more details.
  55 <P>
  56 You should have received a copy of the GNU General Public License
  57 along with this program; if not, write to the Free Software
  58 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  59 USA.
  60
  61
  62 <a name="3"> <H2> 1.3 Final remarks</H2></A>
  63 <P>
  64 I kindly ask to acknowledge the use of the software in articles,
  65 reports etc. in case the software has considerably contributed in the
  66 analyzes of PIV images.  I hope you'll enjoy GPIV. Suggestions for
  67 improvements and additions are welcome.
  68 <P>
  69 Gerber van der Graaf<br>
  70 e-mail: <a href=mailto:gerber.van.der.graaf@upc.es>gerber.van.der.graaf@upc.es</a>
  71 <P>
  72 <a name="4"> <H2> References</H2></A>
  73 [1] Okamoto, K., Nishio, S., Saga, T. and Kobayashi, T., 2000, "Standard images
  74 for particle-image velocimetry," Meas. Sci. Technol., 11, 685-691.
  75 <a href="http://www.vsj.or.jp/piv/"> vsj.or.jp/piv/ </a>
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