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This example shows an image analysis technique to detect anhydrous phase and aggregate from a polished concrete section observed by scanning electron microscope (SEM). The anhydrous phase appears as white grains while the aggregate appears in the image as an homogeneous medium-gray grains. This image was kindly provided by Prof. Gladis Camarini from FEC-UNICAMP.
The steps for this analysis are: i) anhydrous detection by automatic threshold analysis; ii) homogeneous grain detection using watershed technique; iii) aggregate are homogeneous grains that are not from the anhydrous phase. The automatic threshold analysis is done using 1D-signal morphological processing using watershed.
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Copyright (c) 2003, Roberto A. Lotufo, UNICAMP-University of Campinas; Rubens C. Machado, CenPRA-Renato Archer Research Center. |