Then when the angular axis has been defined by playing with the angular bin, every pixel is associated with the closest angle value. In order to calculate the angular position of every single image relative to the top vertical position, the center of the pixel is used. The following diagram will help explain the math behind the profile calculation. A progress bar displayed at the bottom of the UI will show the progress of the calculation as the program extracts the profile for every single radiograph you loaded. To visualize the angle value of each pixel of the ring, click the “angles matrix of ring” radio button on top of the preview image.Ĭlick the calculate profiles button to produce the profile of the ring. The angles bins (degrees) slider allows you to get a thinner or coarser profile.
The notebook will create a table of counts versus angles. It’s possible to measure the angular position of any element relative to the custom center defined by playing with the angle cursor widgets. To change the thickness of the ring, play with the thickness slider on the right of the preview. You can also play with the inner radius slider on the right to change the size. Via the plot, click and little square box on the bottom right of the ring to change the size of the ring. Then you can modify the ring size using either the mouse directly on the plot, or the widgets on the right of the preview. Feel free to use the mouse wheel to zoom in and/or out the image. Using the mouse + left click, you can move the ring around and use the grid tool (size and color can be modified) in order to place with high precision the center of the ring. The user interface contains 3 main parts: * on the left – preview of the radiographs loaded + grid + ring selection * on the right – ring, grid, and angle bin settings * hiding in the slider on the far right – the result of circular profile of the ring.
The radiographs will be loaded in memory and a progress bar will display the progress of the loading. Using the folder selection tool, select the folder containing all the images to get a profile from. Need help using the IPTS selector? Select the images
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