Multiresolution Snakes for urban road extraction from Ikonos and Quickbird images

摘要

This article addresses the problem of street extraction in high resolution images from a topologically correct graph of the network. The extraction algorithm makes use of specific active contours (snakes) combined with a multiresolution analysis (MRA). The use of the MRA for computing the snake's energy enables to increase the convergence of the algorithm by minimizing the problem of noise (vehicles, ground markings,...). This phase is composed of two sequential steps: the extraction of street segments and the extraction of street intersections. Indeed, these two objects present too many differences in both topology and shape to be processed in the same way. Results of the street network extraction are presented in order to illustrate the different steps of the method and future prospects are exposed.