This feature requires the Analyze-License
Display the radial distortion as profile
Display the tangential distortion as profile
Display the distortion as grid
With the tab-control you can select between three different graphical representations of the distortion data:
In addition the following buttons are available:
The two check boxes affect the representation of the indicated curves:
The graph shows the distortion factor shapes for 20 different directions, originating from the distortion center. The distortion factor is the factor, by which the vector between the distortion center and the undistorted point must be multiplied scalarly, so that it points to the appropriate, radially distorted, position.
By using the direction control
the curve, which corresponds to the adjusted direction, is highlighted in the chart. Drag the mouse with pressed button to move the direction pointer. The 0° angle shows to the right and the positive rotation direction is counter clockwise.
The data, which corresponds both to this representation, and the representation of the tangential distortion profile, can be found in the ssv-table "Distortion profile ...".
The graph shows the tangential distortion portion as rotation around the distortion center in degree. A positive angle means a counter-clockwise rotation. According to the radial distortion profile, the values are read off dependent on direction (selectable with the direction control) and distance to the distortion center.
The data, which corresponds both to this representation, and the representation of the radial distortion profile, can be found in the ssv-table "Distortion profile ...".
This representation illustrates the distortion with the help of two grids put over the photo surface. The undistorted variant is drawn in black, whereas the distorted variant is drawn in red color. Thus strength and kind of the distortion can be estimated on a view. In addition this representation shows the distortion center marked by a small cross.
The data, which corresponds to this representation can be found in the ssv-table "Distortion grid ...".
With the button "distortion profile..." the complete distortion data of the current calibration set is saved in a ssv-table (Semicolon Separated Value).
A ssv-table is a text file, in which the columns are separated by semicolons (in contrast to a csv-table, where the columns are separated by commas). For viewing and processing the contained data any conventional spreadsheet application is suitable, like e.g. OpenOffice Calc or Microsoft Excel.
In order to import the ssv-table into OpenOffice for example, proceed as follows:
The file contains following data:
Note: Please read in the previous section "Save distortion profile in ssv-table", how to import ssv-tables into OpenOffice or Excel!
The distortion grid table contains the data, which corresponds to the above representation of the distortion grid. For each focal length exists both a table for the point shift in X and a table for the point shift in Y-direction. Therefore the distortion for certain locations on the image area can be read off directly with this dataset.
If possible, the distortion grid data should be preferred to the distortion profile data, since the accuracy of the grid data is sometimes higher (this data is also used in the HQ-mode). The reason is that it mainly forms the calculation basis for the distortion profile.
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