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Additional processing steps. (a) An example of a fragmented particle that resulted from a higher threshold. The software joins the fragments (red lines). (b) A convex hull step is applied to the image in (a). (c) The original thresholded image from the same ROI. (d) The result of an “AND” operation applied to images (b) and (c). (e) Image of particle with overlay obtained from (d). (f) The result of the overlay if dark-pixels only are used in the variable threshold process.
