Changes between Version 16 and Version 17 of Tutorial/AdvancedParticleImagingVelocimetry2


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Timestamp:
Aug 28, 2013, 3:57:11 PM (8 years ago)
Author:
sommeria
Comment:

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  • Tutorial/AdvancedParticleImagingVelocimetry2

    v16 v17  
    33
    44= calibration =
    5 Mark the four box corners with the mouse. We find the coordinates of the four calibration points in pixels.
    6 
    7 (X,Y)=(80.3, 81.6), (982.3, 86.1), (978.9, 937.4), (71.2, 929.5).
    8 
    9 The corresponding physical coordinates are known to be
    10 
    11 (x,y)=(0,0),(58.8,0),(58.8,55.1),(0,55.1), with an origin (0,0) taken at the lower left (and z=0).
    12 
    13 Introduce those in the table [!ListCoord]. This can be conveniently done by copy paste of the Matlab vector x=[0 58.8 58.8 0] in the upper line of the x column, and y=[0 0 55.1 55.1] in the y column (use carriage return to validate the input).
    14 Then apply rescale. we observe that the figre is slightly rotated.
    15 We then apply linear which allows for rotation. The precison is improved.
     5Perform the geometric calibration by marking the four box corners with the mouse, as described in [wiki:"Tutorial: geometric calibration" Tutorial: geometric calibration], section 'calibration with a set of reference points. Alternatively, you can skip this operation by using the reference file Dalsa1.ref.xml provided, removing the extension '.ref' to make it active.
    166
    177= mask =