# Changes between Version 20 and Version 21 of Tutorial/GeometricCalibration

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Timestamp:
Jan 15, 2015, 2:31:05 PM (6 years ago)
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• ## Tutorial/GeometricCalibration

 v20 The origin of the phys coordinates 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). To 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. To get the precise position of the cylindre, it is useful to introduce a projection circle, using in '''uvmat''' the menu bar command Projection '''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. To 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). -Open with '''uvmat''' one of the image of the series to calibrate, select '''Tools/geometric calibration''', and in the GUI '''geometry_calib''', the menu ba'''r Import/All''', then press''' APPLY'''. For further repetitions, the GUI '''geometry_calib''' can be left opened while new image series are opened, and '''APPLY''' repeated each time without importing the calibration data again. [[BR]] -In case of many image series, use '''RELICATE''' instead of '''APPLY''' in the GUI '''geometry_calib. '''Then select the 'campaign' to calibrate, i.e. the folder containing the series of experiments. Then in the new GUI '''browse_data''', select the set of experiments and the corresponding set of data series to which the calibration must apply (this is used like '''Open campaign''' in '''uvmat'''). -In case of many image series, use '''REPLICATE''' instead of '''APPLY''' in the GUI '''geometry_calib. '''Then select the 'campaign' to calibrate, i.e. the folder containing the series of experiments. Then in the new GUI '''browse_data''', select the set of experiments and the corresponding set of data series to which the calibration must apply (this is used like '''Open campaign''' in '''uvmat''').