The Weizmann Institute of Science Faculty of Mathematics and Computer Science Vision and Robotics Seminar Lecture Hall, Room 1, Ziskind Building on Monday, June 6, 2011 at 13:00 Note unusual day/time Stephane Mallat CMAP, Ecole Polytechnique will speak on Image Classification with Invariant Representations Abstract: Classification requires finding appropriate metrics to compare signals. Visual perceptual metrics remain a mystery. They are invariant to particular groups of transformations such as translations and scaling and are continuous to deformations relatively to these group actions. Such invariant representations can linearize classification problems, but finding them is a challenge. We introduce a class of non-linear scattering operators which satisfy invariance and deformation continuity properties. They are computed by cascading modulus operators and wavelets transforms on the group. For translations, it provides new representations of stationary processes which discriminates textures having same power spectrum. A linear PCA classification applied to scattering representation is shown to provide state of the art classification results on data bases of structured patterns and for textures. Relations of invariant scattering with vision and auditory physiology will be discussed. --------------------------------------------------------- Technion Math Net-2 (TECHMATH2) Editor: Michael Cwikel <techm@math.technion.ac.il> Announcement from: Diana Mandelik <diana.mandelik@weizmann.ac.il>