SCALE-SPACE EVENTS AND THEIR LINK TO ABSTRACTION FOR ROAD EXTRACTION

Abs., which is defined here as the increase of the degree of simplific ation and emphasis, is of major importance for object extraction. In t his paper it is shown theoretically as well as empirically, how so-cal led scale-space events for lines define multiple abstraction levels fo r roads in images. The investigations are based on different scale-spa ces as well as on a sophisticated model for line extraction for which the scales where events occur can be determined analytically. As one r esult of the investigations, a model is derived which is used in a mul ti-scale, multi-abstraction level road extraction system. (C) 1998 Els evier Science B.V. All rights reserved.