Version 4 (modified by 11 years ago) (diff) | ,
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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
making two masks
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 the box edit (tag [CheckEditObject]) in the frame Object of uvmat (right hand side) to allow editing of the polygon. then replace the lower x bound 0 by 52. Then create the corresponding mask by Tools/make mask, save it with name Dalsa1.mask/mask_plume.png. Similarly create a mask for the bulk Dalsa1.mask/mask_bulk.png, with bounds in x [0 55].
PIV on the parietal plume
Choose the following parameters: pair j=1-2 for Civ1 and Civ2 : it minimises the time interval which is needed to cpature the large velocity in the plume. CorrBox? x,y=(5 31) which optimizes the resolution in x (5 pixels) Search x, y=(25 55) which allows for a larger velocity component along y . auto-grid Dx=2, Dy=10, consistent with CoorBox? (about half the box size). Mask selected, with name .../Dalsa1.mask/mask_plume.png . For Civ2, same parameters CorrBox?, auto-grid and Mask. For patch and Fix, default parameters.
PIV on the interior
merging data on a common grid
Attachments (2)
- Tutorial8 - Merging data using thin plate spline.png (68.2 KB) - added by 10 years ago.
- Tutorial8 - Merging data using TPS.png (65.4 KB) - added by 10 years ago.
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