Professor Dr. Christian Clason (Uni Duisburg Essen)

Date:  27 September  2017

Time: 12:45 - 13:30 (Lunch available from 12:35)

Room: RA 1501 (Ravelijn)

Title: Convex regularization of discrete-valued inverse problems


We consider inverse problems where a distributed parameter is known a priori to only take on values from a given discrete set. This property can be promoted in Tikhonov regularization with the aid of a suitable convex but nondifferentiable regularization term. This allows applying standard approaches to show well-posedness and convergence rates in Bregman distance. Using the specific properties of the regularization term, it can be shown that convergence (albeit without rates) actually holds pointwise. Furthermore, the resulting Tikhonov functional can be minimized efficiently using a semi-smooth Newton method. Numerical examples illustrate the properties of the regularization term and the numerical solution.