Aarhus University Seal / Aarhus Universitets segl

Convergence rates for variational regularization of inverse problems with stochastic data

Yusufu Simayi
(Georg-August-Universität Göttingen)
Stochastics Seminar
Thursday, 16 May, 2019, at 13:15-14:00, in Koll. D (1531-211)
Abstract:
We  consider  variational regularization methods for mildly ill-posed inverse problems described by operator equations $F(f)=g$ in Hilbert spaces.  One focus of this talk will be on statistical data noise models: We will present a general framework which allows to treat many noise models and data fidelity terms in a unified setting, including Gaussian and Poisson and empirical processes and show (nearly) optimal rates of convergence as the noise level tends to zero. Such inverse problems for example occur in parameter identification problems in stochastic differential equations and Photonic imaging etc. The main tool of our analysis are large deviation inequalities for stochastic processes in negative Besov norms. 
Contact person: Jevgenijs Ivanovs