Changes between Version 47 and Version 48 of Tutorial/GeometricCalibration


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Timestamp:
Jan 29, 2015, 11:39:02 AM (6 years ago)
Author:
vaillant1p
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  • Tutorial/GeometricCalibration

    v47 v48  
    7070The calibration of the previous section provides 3D information, such as the intrinsic parameters, thanks to the inclination of the calibration grid, but the precision is not optimum, and the process would not converge for a grid perpendicular to the line of view. A more precise procedure consists in first of determining the intrinsic parameters by mutiple views of the same grid with different inclinations.
    7171
    72 Once the grid image is correctly set, click on the '''[APPEND LIST]''' button in '''[Point Lists]''' in''' 'geometry_calib''''. This will save the grid as 'img~.xml' file. This document is saved in the same folder as the image. To open it select '''[Import.../Calibration points]'''.
     72Once the grid image is correctly set, in''' 'geometry_calib' '''click on the '''[APPEND LIST]''' button in '''[Point Lists]'''. This will save the grid as 'img~.xml' file. This document is saved in the same folder as the image. To open it select '''[Import.../Calibration points]'''.
    7373
    7474Now that the calibration is made for the first image we need to do it for the other ones, you can open the different grids 'img.ref~.xml' to skip the calibration. Once a document is open, the grid is shown in '''uvmat''', to save it in the '''[Point Lists]''' click on '''[APPEND LIST]''', it will appear below the first saved document.
     
    7878When all the grids are selected in '''[Point Lists]''', select '''[APPLY]'''. The calibration on every image is now made and the values of the intrinsic parameters are reevaluated according to the different data determined by every calibration. Note that the more images used for the calibration, the more precise the intrinsic parameters will be.
    7979
    80 For the next calibration, to avoid any change on the intrinsic parameters, select the option '''3D_extrinsic''' in '''[calib_type]''' in''' 'geometry_calib''''. It applies a 3D projection and quadratic correction according to the already determined intrinsic parameters.
     80For the next calibration, to avoid any change on the intrinsic parameters, in''' 'geometry_calib' '''select the option '''3D_extrinsic''' in '''[calib_type]'''. It applies a 3D projection and quadratic correction according to the already determined intrinsic parameters.
    8181
    8282== '''Merging the images of several cameras:''' ==