TITLE:
Multi Threshold Comparator Avizo Plugin

PLUGIN DESCIPTION:
Multi Threshold Comparator is an Avizo software plugin that assist users in choosing the right threshold value when using X-ray Computed Tomography (XCT) data for porosity analysis. The objective of the developed Avizo plugin is to compare multiple threshold types (Otsu, global and local) across a range of values, based on a previously measured hole, to eventually assist the user in choosing the suitable threshold value.

DESCRIPTION OF PLUGIN FOLDER:
The folder is composed of two files .pyscro and .rc files to be placed in Avizo installation folder, for example, : C:\ProgramFiles\Thermo Scientific Amira-Avizo3D 2022.1\share\python script objects


DESCRIPTION of PLUGIN WORKFLOW:
The plugin can only work within Avizo. It can be used on 3D Tif stacks representing a previously measured hole within the XCT scanned data.
The hole data to be analysed needs to be 8bit, have a minimum of 2 slice images, and the orientation of the stack needs to show the diameter as circles.
The plugin compares the reference measurement, for example done in scanning electron microscope to diameter from XCT obtained using Otsu, a range of global threshold and a range of local thresholds.
To calculate the diameter, the plugin would apply a contour function on the thresholded hole and the contour coordinates get extracted. A least squares best fit circle fitting function is then applied to calculate the radius of curvature and the circle origin.
In summary, the plugin takes as input the XCT hole original diameter, previously measured diameter, range of global thresholds to assess, and range of local thresholds to assess. The plugin would then output plots showing the diameter of the hole at each threshold iteration. 

LICENSE:
BSD Licence