Changes between Version 2 and Version 3 of Tutorial/GeometricCalibration


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Timestamp:
Aug 26, 2013, 8:46:02 PM (8 years ago)
Author:
sommeria
Comment:

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  • Tutorial/GeometricCalibration

    v2 v3  
    55First zoom on the cylinder to optimize the precison. Select zoom on, press the left mouse button and adjust the field with the directional key board arrows. Then unselect '''zoom on''' to allows for other mouse actions (otherwise zoom has priority). It is also useful to increase the contrast at the cylinder edge by setting '''MaxA''' to 100 in the frame '''Scalar''' (right side of uvmat).
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    7 Then select the menu bar the menu bar '''Tools/ruler''', press the left hand mouse button on the cylinder edge, draw a diameter keeping the mouse pressed, release it onthe opposite edge. The length in pixels, 140, is displayed.
     7Then select the menu bar the menu bar '''Tools/ruler''', press the left hand mouse button on the cylinder edge, draw a diameter keeping the mouse pressed, release it onthe opposite edge. The length in pixels, 140, is displayed, so the scaling factor is 140/2=70 pixels/cm.
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     9Open the menu bar '''Tools/geometric calibration'''. A new GUI '''geometry_calib''' appears on the right side. Activate the upper menu bar '''Tools/Set scale''' on this GUI and introduces the value 70 in the edit box which pops up, and validate with '''OK'''. A set of calibration point coordinates appears in the table '''[ListCoord]''' of the GUI.
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     11To see the calibration points, first display the whole image by unselecting fix (tag '''[CheckFixLimits]''') in the frame '''Coordinates''' of uvmat. Then press '''PLOT PTS''' in '''geometry_calib'''.
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