Jean-Michel Morel is professor of mathematics at Ecole Normale Supérieure Paris-Saclay. He works on theories and algorithms for the restoration and automatic analysis of digital images and video. Bernard Teissier is Emeritus Director of Research of CNRS at the Institut Mathématique de Jussieu-Paris Rive Gauche. His research interests center on the algebra and geometry of singularities in algebraic and analytic geometry.