Changes between Version 5 and Version 6 of Tutorial/DisplacementMeasuredByImageCorrelation


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Timestamp:
Jan 24, 2015, 11:41:52 PM (6 years ago)
Author:
sommeria
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  • Tutorial/DisplacementMeasuredByImageCorrelation

    v5 v6  
    11[[TracNav(Tutorial/TOC)]]
     2
    23= [wiki:Tutorial] / Displacement Measured by Image Correlation =
     4This demo shows how to use image correlation to measure a displacement versus time (instead of velocity). Open the image UVMAT_DEMO06_displacement (accessible on http://servforge.legi.grenoble-inp.fr/pub/soft-uvmat/).
    35
    4 This demo shows how to use image correlation to measure a displacement versus time (instead of velocity).
    5 Open the image UVMAT_DEMO06_displacement (accessible on http://servforge.legi.grenoble-inp.fr/pub/soft-uvmat/).
     6'''Looking at the images:'''
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    7 Open an image UVMAT_DEMO06_displacement. This is a target pattern used to measure the displacement of a plate vs time.
     8Open an image UVMAT_DEMO06_displacement. This is a target pattern used to measure the displacement of a plate vs time. Observe the motion by scanning the images.
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    9 Majke a mask, like explained for tutorial
     10Make a mask to remove the outer part in the PIV processing, like explained for tutorial 5, or introduce the mask provided .ref (selecting the upper bar button .. in uvmat)
    1011
    11 Oben series/civ_series. import Config for ref file, .ref .
     12'''Civ in mode 'displacement':'''
     13
     14Open series/civ_series. import Config for ref file, .ref . The appropriate parameters are displayed:
     15
     16 * mode displacement, with respect the origin index 1 (first image)
     17 * Correlation box fairly large 31 corresponding to a coarse pattern, and considering that spatial resolution is not critical.
     18 * Large search 107 need to capture the max displacement
     19 * !!CorrSmooth =2 corresponding top carse 'particles': large correlation curves. See ! TestCiv1.
     20 * Mask selected to isolate the active area
     21 * Fairly large ! FieldSmooth (spatial resolution not critical) and no 'deformation' needed for civ2
     22 * Civ2 smaller search zone as we start form  the prediction of Civ2 (shift)
     23
     24'''Observing the civ data:'''
     25
     26velocity, vorticity, div
     27
     28'''Time series:'''
     29
     30Make a point, range=200, and run series/time series. Observe the curve displacement U and V versus time.
     31
     32+ rotation + div