Changes between Version 13 and Version 14 of Tutorial/AdvancedParticleImagingVelocimetry2


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Timestamp:
Aug 28, 2013, 12:29:18 PM (8 years ago)
Author:
sommeria
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  • Tutorial/AdvancedParticleImagingVelocimetry2

    v13 v14  
    33
    44= calibration =
    5 mark the four box corners with the mouse. We find ....
    6 The corresponding physical coordinates are known to be (0,0),(58.8,0),(58.8,55.1),(0,55.1), with an origin (0,0) taken at the lower left. 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).
     5Mark 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, 937.386),(71.2, 929.5).
     8
     9The 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
     13Introduce 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).
    714Then apply rescale. we observe that the figre is slightly rotated.
    815We then apply linear which allows for rotation. The precison is improved.