In this paper, an algorithm for automatic extraction of expressways from high resolution satellite images is proposed. Some characteristic geometrical properties of expressways are assumed and an algorithm of road extraction is constructed based on the assumptions. Two of the assumptions are: Expressways can be approximately linear within each small region of images and they are continuous; and Zero-crossings of the image intensity are used for edge detection. The possibility that a pixel on an edge exists on a road is estimated. A road is extracted as a continuous line using those values of the possibility and the continuity of road. The proposed algorithm can be applied to extract railways and main rivers by changing the algorithm according to the properties of the objects.
Automatic Road Extraction from Satellite Images Using Zero-Crossings
1993
8 pages
Report
No indication
English
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