The "heart" of the software is the correlation algorithm. Direct cross correlation (in the spatial domain) and a discrete Fourier transform correlation (in the frequency domain) can be selected. The displacement of the particles is calculated in several passes while the grid is refined and the interrogation windows are deformed. The data can be validated, interpolated and smoothed; a lot of data extraction tools and export formats are available. Of course, derivatives like vorticity, magnitude of velocity etc. are also available.
Our open-source software is used in numerous scientific studies all around the world and it receives very positive feedback. Further details can be found on the PIVlab website
Screen capture of PIVlab:
Video of an analysis:
Analysis of a vortex ring, colored with velocity magnitude and line integral convolution: