Straighten
Images of structures captured in a µCT scanner may appear slightly bowed or warped. Straightening these images is especially interesting in the case of flat geometries and can be used to make the structure in the image lie flat again. To do so, a surface with a given Surface Degree of a polynomial surface used for interpolation is fitted through the structure and aligned to a Sheet Plane.
Select the Sheet Plane in which the structure lies, either in the X-Y, X-Z, or Y-Z direction, or allow the direction to be estimated Automatically. For automatic determination of the plane, a threshold is needed to obtain the structure. This is based on Global Thresholding. If you select Automatic Threshold, the thresholds is computed based on the Otsu algorithm. Otherwise, enter a Manual Threshold.
Click Apply to straighten the structure with the current settings.
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Know how! Straightening can be helpful to improve the cropping of empty space without the loss of sample material voxels. |
Example
The bow of a granular structure is removed by applying the straightening process here. The bow can be seen in the 2D Slice Visualization section. The first and last X-slices are shown here. Compare the two slices to observe the bow in both slices and in the X-direction. Applying the Straighten tool with the default settings produces a straightened structure, which is shown in both 2D and 3D.
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Know how! You can Save your current settings for this tool as Start-Up Settings . The next time you process an image, these settings will be automatically loaded and filled into the parameter fields. You can also load the Built-In Default Settings available in GeoDict. If you change any settings and want to revert to your saved start-up settings, click the corresponding button to Load the Start-Up Settings . |
