Changes between Version 8 and Version 9 of Tutorial/GeometricCalibration

Timestamp:

Aug 28, 2013, 3:50:25 PM (11 years ago)

Author:

sommeria

Comment:

--

Tutorial/GeometricCalibration

@@ -16 +16 @@
 'images.ref.xml' put for reference).
 
-= translating and rotating the coordinates =
-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).
+= translating the coordinates =
+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)=(1.69, 4.05).
 
-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'''. 
+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 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).
 
 = Calibration with reference points =