Learn More
In this paper we study the nonconvex anisotropic mean curvature flow of a hypersur-face. This corresponds to an anisotropic mean curvature flow where the anisotropy has a nonconvex Frank diagram. The geometric evolution law is therefore forward-backward parabolic in character, hence ill-posed in general. We study a particular regularization of this(More)
The evolution of a curvature dependent interface is approximated via a singularly perturbed parabolic double obstacle problem with small parameter " > 0. The velocity normal to the front is proportional to its mean curvature plus a forcing term. Optimal interface error estimates of order O(" 2) are derived for smooth evolutions, that is before singularities(More)
We introduce and study a two-dimensional variational model for the reconstruction of a smooth generic solid shape E, which may handle the self-occlusions and that can be considered as an improvement of the 2.1D sketch of Nitzberg and Mumford (Proceedings of the Third International Conference on Computer Vision, Osaka, 1990). We characterize from the(More)
Solutions of the so-called prescribed curvature problem min A⊆Ω P Ω (A) − A g(x), g being the curvature field, are approximated via a singularly perturbed elliptic PDE of bistable type. For nondegenerate relative minimizers A ⊂⊂ Ω we prove an O(2 | log | 2) error estimate (where stands for the perturbation parameter), and show that this estimate is(More)
We study the asymptotic analysis of a singularly perturbed weakly parabolic system of m-equations of anisotropic reaction-diffusion type. Our main result formally shows that solutions to the system approximate a geometric motion of a hypersurface by anisotropic mean curvature. The anisotropy, supposed to be uniformly convex, is explicit and turns out to be(More)
In this paper we estimate the area of the graph of a map u : Ω ⊂ R 2 → R 2 discontinuous on a segment Ju, with Ju either compactly contained in the bounded open set Ω, or starting and ending on ∂Ω. We characterize A ∞ (u, Ω), the relaxed area functional in a sort of uniform convergence, in terms of the infimum of the area of those surfaces in R 3 spanning(More)