[Up] [mmdarea] | Demonstrations |
In this example, a satellite image of an airport is processed. The aim is to detect the runways which are characterized by thin, long and straight features. An open top-hat is first used to enhance the runways. A rough thresholding followed by a thinning operator gives most of the thin structures of the image. They can filtered by selecting only closed features with sufficient length. This result is used as a marker to reconstruct the original gray-scale image, giving as output a gray-scale enhanced airport runways, which can be finally thresholded.
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Copyright (c) 2003, Roberto A. Lotufo, UNICAMP-University of Campinas; Rubens C. Machado, CenPRA-Renato Archer Research Center. |