Changes between Version 17 and Version 18 of WikiStart


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Timestamp:
Sep 11, 2017, 1:47:39 PM (7 years ago)
Author:
steiger5na
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  • WikiStart

    v17 v18  
    3232== 2.2 Topography ==
    3333=== 2.2.1 Topography for the shelf break experiments (Nadine) ===
    34  * Check and add the location of the wall/sink!
     34''[[Image(Bathymetry_with_Positions.png, 300px)]]''
    3535
    3636=== 2.2.2 Topography for the ice shelf experiments ===
    … …  
    109109The images are divided into the two different cameras as PCO1/ and PCO2/.
    110110
     111''[[Image(Topography_with_PositionCameras.png, 300px)]]''
     112
     113''This sketch shows the topography together with the view of the two cameras.''
     114
    111115The  3D calibration is done with the geometric calibration function on UVMAT  to create 'intrinsic parameters' for each camera that will be used for  all images. Calibration points along the inclined grid are marked and  translated from image coordinates to physical coordinates defined in  section 2.3.1 to later take into account the different height of slices. See http://servforge.legi.grenoble-inp.fr/projects/soft-uvmat/wiki/UvmatHelp#GeometryCalib  for details of the method. The calibration parameters are copied in a  xml file beside the folders of each camera (for instance PCO2.xml for  PCO2/). The xml files also containing all the timing information and  have to be copied next to the folders of all images, to use the same  intrinsic calibration data for each image taken with the corresponding  camera.
    112116
    113117The 2D calibration is used as a reference horizontal grid with a grid height of[[BR]]- z = 80.8 cm for PCO1[[BR]]- z = 58.2 cm for PCO2
    114118
     119''[[Image(PCO1_Calibration2.png, 300px)]]  ''[[Image(PCO2_Calibration.png, 300px)]]'''''''
     120
    115121The  calibration is checked with a calibration ruler (images saved in  CALIB_RULER) to see that the transition between the two cameras is  smooth.
    116122
    117123For the vertical calibration the images are saved in a different file format with extension '.seq'. The format can be changed in the UVMAT software, but the folder with the vertical images should not be renamed (e.g. '2017-09-08T16.04.32'). To change the image format, choose RUN -> Field Series. Chose the right input file, an select 'extract_rdvision.m', click INPUT and RUN. The image will be saved as a .png file and is ready for use in UVMAT.
    118 
    119 ''[[Image(DSC_0811_00001.jpg)]]''
    120124
    121125== 4.2 Calibration for ice shelf experiments ==