LIBPIV Core functions

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General functions of Libgpiv

• Input/output from files or stdin/stdout.
• Data storage in ASCII format or HDF version 5 format.
• Parameter search at local directory, home directory or system wide configuration file. If all are absent, hard-coded default values are used.
• Data visualization by means of gnuplot.

Data Acquition

• Trigering of lasers and camera by using Real Time Application Interface (RTAI).
• Recording of images from (IIDC-compliant) IEEE-1394 (Firewire) camera's.

Image interrogation

• Interrogation at the entire image or at a defined region within the image frames resulting into a displacement field on a rectangular grid.
• Interrogation at a single arbitrary point, along a vertical or horizontal line.
• FFT at competetive speed.
• Arbitrary interrogation area sizes.
• Global pre-shifting.
• Linear weighting filter or local pre-shifting (zero offsetting) of the interrogation areas.
• Forward and central interrogation scheme
• Adaptive interrogation area sizes to obtain high resolution and dynamic range.
• Cross and auto correlation.
• Defining order of correlation peak to be used as estimator.

PIV data validation

• Enabling and disabling PIV estimators individually or within a rectangular block.
• Checking on peak-locking effects.
• Validation on outliers by SNR value or median test.

PIV data post processing

• Manipulation (flipping, rotating, ..) of the data.
• Time and spatial scaling
• Calculation of statistics and subtraction of mean values from estimators.
• Calculation of vorticity and strain by different differential schemes.