Abstract

Contextual information can facilitate automatic extraction of objects from digital imagery. This paper addresses the use of context for the automatic extraction of roads from aerial imagery. Context is restricted to knowledge about relations between roads and other objects and is hierarchically structured. More specific, context is used to guide road extraction on a global and on a local level. On a global level it is used to emphasize characteristic parts of the road model (context regions). On a local level it initiates contextual reasoning (context sketches). 1 Introduction The automatic extraction of objects from digital imagery is a very complex task. It is widely accepted that the complexity can be reduced by integrating context information into the extraction process, e.g. (Strat 1992). Generally speaking, context means that there exists knowledge not only about the object of interest but also about other relevant facts and their relations to the object of interest. Apart from ...

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