Gpiv 0.4.0 C/C++ script

Publisher review:
Gpiv is a graphic user interface program for recording and analyzing images obtained from a fluid flow. Gpiv is a graphic user interface program for recording and analyzing images obtained from a fluid flow that has been seeded with tracer particles by the so-called Particle Image Velocimetry technique (PIV).The program allows to have a quick overview of the parameter settings of all processes, easily changing them, executing the processes and visualizing their results in an interactive way . Gpiv has been built with the Gtk/Gnome libraries and includes many interesting features.Features:General - Data storage in ASCII or HDF format. - Integration within the Gnome desktop: Loading of images with "drag and drop" from the gnome file-manager Nautilus into the buffer list. Inclusion of Gpiv launcher into menu and taskbar (pre-compiled package). - Pipeline execution of enabled processes. - Batch processing on selected buffers. - Minimizing the console interface when desired by undisplaying the parameter settings tabulator and detaching the buffer list. - Quick execution by means of toolbar buttons. - On-line help from info line, tooltips and manual. Display - Visualization of the image(pair). - Shows interrogation area contours that will be highlighted when pointing to them. - Displaying of pointer position and belonging estimated values. - In and out zooming of displayed features. - Defining vector length. - Showing of vector colors related to specified criterium (validation threshold, correlation peak number, enabled/disabled) - Displaying of derived scalar quantities (vorticity and strain) as background. Record - Triggering of lasers and camera by means of RTAI over the parallel port of the Computer. - Recording images from a IIDC-compliant (CCD) camera that is connected to the Computer by the IEEE1394 (Firewire, I-Link) protocol. Image - Displaying image name, dimensions and type of correlation (cross or auto). - Defining of spatial and time scales, position of image within the experiment. - Adding and updating header information (date of creation, project, comment etc). Interrogation - Interrogation by means of image-deformation techniques, using 5th order B-spline interpolation. - Adaptive interrogation area sizes. - Grid refinement by using bi-linear interpolation with shifted knots. - Validation after each iterative interrogation step. - Global pre-shifting. - Local pre-shifting or zero offsetting of the interrogation areas with forward or central difference scheme at integer number of pixels. - Three interpolation schemes for sub-pixel estimation. - Cross and auto correlation. - Choice of correlation peak for estimating particle displacements. - Arbitrary interrogation area dimensions. - Interrogation at the entire image or at an Area Of Interest, resulting into a displacement field on a rectangular grid. - Interrogation at a single arbitrary point, along a vertical or horizontal line by pointing in the image frame. - Re-interrogation of a single area with different parameters. - Dragging a single interrogation area from the rectangular grid. - Visualization of interrogation area's and correlation function. Data validation - Enabling and disabling of PIV estimators manually. - Graphical representation of histogram containing displacements at sub-pixel level to check on peak-locking effects. - Graphical representation of histogram of residuals, calculation of threshold for acceptance of PIV estimators. - Validation on outliers by SNR value or median test from normalized residus. Post-processing - Time and spatial scaling. - Calculation of statistics and subtraction of the mean value from the estimators. - Calculation of vorticity and strain.
Operating system:
Linux / BSD

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