This is an example using more advanced tools than the examples .... and .... Image pre_processing and merging of mutiple fields. Open the example UVMAT_DEMO_FILES/EX07_convection . = calibration = mark corners = mask = = sub_background = = first PIV = = PIV on the parietal plume = The parietal jet requires a very good resolution, particularly among x. To limitate PIV to this jet, let us create a specific mask. Open the previously created contour polygon contour_mask.xml in uvmat by the menu bar '''Tools/Projection object/browse...'''. Check '''edit''' (tag '''[CheckEditObject]''') = PIV on the interior = = merging data on a common grid =