Changes between Version 8 and Version 9 of Tutorial/GeometricCalibration


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Timestamp:
Aug 28, 2013, 3:50:25 PM (8 years ago)
Author:
sommeria
Comment:

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  • Tutorial/GeometricCalibration

    v8 v9  
    1616'images.ref.xml' put for reference).
    1717
    18 = translating and rotating the coordinates =
    19 The origin of the phys coordiantes is now arbitrary. It is more convenient to have it for instance at the centre of the cylinder, now at (x,y)=(1.7, 4.0).
     18= translating the coordinates =
     19The origin of the phys coordiantes is now arbitrary. It is more convenient to have it for instance at the centre of the cylinder, now at (x,y)=(1.69, 4.05).
    2020
    21 To get the precise position of the cylindre, it is useful to introduce a projection point, using in '''uvmat''' the menu bar command Projection '''object/points'''.
     21To get the precise position of the cylindre, it is useful to introduce a projection circle, using in '''uvmat''' the menu bar command Projection '''object/ellipse'''. In '''set_object''', select '''!ProjMode=''''none', so that the line is just used as a marker, without projection operation. Set !XMax=1, !YMax=1, the radius of the circle, and the coordinates (1.69, 4.05) of the centre in the table '''Coord'''. Then press '''REFRESH'''. To optimise the visualisation, zoom in and increase the image contrast to MaxA=100.
    2222
    23 
    24 
     23To shift the coordinates, activate in geometry_calib the menu bar command Tools/Translate points, and fills  (x=-1.69, y=-4.05) in the edit box which pops up. the phys coordinates of the calibration points are then shifted, and a new calibration put the cylindre centre at the origin (0,0).
    2524
    2625= Calibration with reference points =