Adaptive estimation of normals and surface area for discrete 3-D objects: application to snow binary data from X-ray tomography. - Frédéric Flin; Jean-Bruno Brzoska; David Coeurjolly; Romeu André Pieritz; Bernard Lesaffre; Cécile Coléou; Pascal Lamboley; Olivier Teytaud; Gérard Vignoles; Jean-François Delesse (IEEE Trans. Image Process., 2005)