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15 pages, 2 figuresInternational audienceIn this article, we study the (d-1)-volume and the covering numbers of the medial axis of a compact set of the Euclidean d-space. In general, this volume is infinite; however, the (d-1)-volume and covering numbers of a filtered medial axis (the mu-medial axis) that is at distance greater than R from the compact set will be explicitely bounded. The behaviour of the bound we obtain with respect to mu, R and the covering numbers of the compact set K are optimal. From this result we deduce that the projection function on a compact subset K of the Euclidean d-space depends continuously on the compact set K, in the L^1 sense. This implies in particular that Federer's curvature measure of a compact set with positive reach can be reliably estimated from a Hausdorff approximation of this set, regardless of any regularity assumption on the approximation

Size of the medial axis and stability of Federer's curvature measures