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The SIMPoly algorithm includes an initial built-in step that uses the SEM micrograph scale bar to convert pixels to micrometers. This allows fiber diameter measurements to be output in microns. If the micrometer/pixel ratio is already known, it can be entered without measurement of the scale bar, or if it is unknown but there is no scale bar, the output will be in pixels. SEM, scanning electron microscopy; SIMPoly, Semiautomated Image Measurements of Polymers.
