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1 LMI - Laboratoire de Mathématique de l-INSA de Rouen 2 Department of Mathematics Hawaii 3 LAMAV - Laboratoire de Mathématiques et leurs Applications de Valenciennes, EA 45 4 IRMAR - Institut de Recherche Mathématique de Rennes

Abstract : In many problems of geophysical interest, when trying to segment images i.e., to locate interfaces between different regions on the images, one has to deal with data that exhibit very complex structures. This occurs, for instance, when describing complex geophysical images with layers, faults,

.; in that case, segmentation is very difficult. Moreover, the segmentation process requires to take into account well data to interpolate, which implies integrating interpolation condition in the mathematical model. More precisely, let I: Ω -> R be a given bounded image function, where Ω is an open and bounded domain that belongs to Rn. Let $S= {x i} i$ ∈ Ω be a finite set of given points well data. The aim is to find a contour Γ ⊂ Ω such that Γ is an object boundary interpolating the points from S. To do that, we combine the ideas of the geodesic active contour Caselles et al., Int. J. Comput. Vision 22-1:61-87, 1997 and of interpolation of points Zhao et al., Comput. Vis. Image Understand. 80:295-314, 1986 in a Level Set approach developed by Osher and Sethian J. Comput. Phys. 79:12-49, 1988. We present modelling of the proposed method. Both theoretical results viscosity solution and numerical results on a velocity model for a real seismic line are given

Autor: Christian Gout - Carole Le Guyader -



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