Changes between Version 3 and Version 4 of Tutorial/ParticleImageVelocimetry


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Timestamp:
Sep 2, 2013, 6:12:38 PM (8 years ago)
Author:
sommeria
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  • Tutorial/ParticleImageVelocimetry

    v3 v4  
    77
    88== Launching PIV ==
    9 The PIV computation is launched from the GUI 'civ', opened from uvmat by the upper bar command '''[RUN/PIV]''', or from '''series''' by selecting the function '''civ_series'''. The name CIV means Correlation Imaging Velocity to stress that the method relies on image correlations, which detects the displacement of image textures, not necessarily from particles.
     9The PIV computation is accessed from uvmat by the upper bar command '''[Run/PIV]''', or from '''series''' by selecting the function '''civ_series'''. The name 'CIV' means '''C'''orrelation '''I'''maging '''V'''elocity to stress that the method relies on image correlation, which evaluates the displacement of image textures, not necessarily from particles. Note that an older GUI ''''civ'''' is also available, but not used here.
     10
     11A new GUI 'cic_input' now appears. In the menu '''[!ListCompareMode]''', keep the default option 'PIV'. Keep also the default option Di=0|1 for the image pair (menu tag '''[!ListPairCiv1]'''). Keep also the default parameters in the frame '''CIV1''' and press '''OK'''.
    1012
    1113The PIV operation depends on many parameters, but the default values proposed by the GUI provide a good first approach in many cases. Press '''[RUN] ''' to get the result. The button is then colored in grey until the computation is finished. The operation produces a  file with format netcdf, extension '''.nc''', in a subdirectory called ''''CIV' ''' by default. The file name ends with index string '_1-2' indicating that it results from images 1 and 2. The file name and its status is indicated in a new figure '''civ_status'''. Press the file name to open it with uvmat, or use the browser of '''uvmat'''.