Changes between Version 37 and Version 38 of Tutorial/GeometricCalibration


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Timestamp:
Jan 26, 2015, 9:49:22 AM (6 years ago)
Author:
vaillant1p
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  • Tutorial/GeometricCalibration

    v37 v38  
    5656
    5757== Calibration with a target grid ==
    58 Most precise and general calibration relies on the use of a target grid. As an example, open in uvmat the image ima_6 in 'UVMAT_DEMO07_GeometryCalibration/Angles/Dalsa1' (accessible on http://servforge.legi.grenoble-inp.fr/pub/soft-uvmat/). Open the menu bar '''[Tools/geometric calibration] '''and pick four corner points ABCD with the mouse define the periphery of the phys grid selected for calibration. The first point A will define the phys axis origin while AB defines the x axis and AD the y axis. AB and DC should be parallel on the phys grid (see fig). Then select''' [!Tools/Detect grid] '''on the upper menu bar of''' geometry_calib''': you get a new GUI '''detect_grid''' in which you define (in phys units) the grid mesh and the positions of the  first and last points on each axis. A z position can be defiend as well, do not fill it in this example. The option white markers is selected (by default) indicating that the grid is white (the opposite option would be needed for a grid made of black crosses on a white background). After validation by '''[OK]''', the detected grid appears on uvmat (see fig).
     58Most precise and general calibration relies on the use of a target grid. As an example, open in uvmat the image ima_6 in 'UVMAT_DEMO07_GeometryCalibration/Angles/Dalsa1' (accessible on http://servforge.legi.grenoble-inp.fr/pub/soft-uvmat/). Open the menu bar '''[Tools/geometric calibration] '''and pick four corner points ABCD with the mouse define the periphery of the phys grid selected for calibration. The first point A will define the phys axis origin while AB defines the x axis and AD the y axis. AB and DC should be parallel on the phys grid (see fig). Then select''' [!Tools/Detect grid] '''on the upper menu bar of''' geometry_calib''': you get a new GUI '''detect_grid''' in which you define (in phys units) the grid mesh and the positions of the  first and last points on each axis. A z position can be defiend as well, do not fill it in this example. The option white markers is selected (by default) indicating that the grid is white (the opposite option would be needed for a grid made of black crosses on a white background). After validation by '''[OK]''', the detected grid appears on uvmat.
     59
     60[[Image(Tutorial3 - Detect Grid)]]
    5961
    6062If a  point is not correct, select the option '''[!CheckEnableMouse]''' in '''geometry_calib'''. Then you can adjust the point marker by selecting it with the (left button) mouse and moving it while keeping the mouse pressed (when adjustement is finished, select the option  '''[!CheckEnableMouse]''' to avoid spurious point creation with the mouse).