Extraction of geographical entities from aerial images

A complete system for extracting geographical entities from aerial images is proposed. The method treats separately the extraction of green areas, forestry and buildings from the extraction of roads. The former issue is addressed with a color segmentation followed by a region growing approach. The latter issue is addressed by a probabilistic contour tracking approach, able to follow roads in highly complex images showed that the proposed method is able to extract most part of the geographical entities present in the image, even in highly urbanized areas.