Krylov Subspace Regularization for Inverse Problems
February 24, 2021
3:00 pm ONLINE
Abstract
Inverse problems arise in a variety of applications: image processing,
finance, mathematical biology, and more. Mathematic models for these
applications may involve integral equations, partial differential
equations, and dynamical systems, and solution schemes are formulated by
applying algorithms that incorporate regularization techniques and/or
statistical approaches. In most cases these solutions schemes involve the
need to solve a large-scale ill-conditioned linear system that is corrupted
by noise and other errors. In this talk we describe Krylov subspace-based
regularization approaches to solve these linear systems that combine direct
matrix factorization methods on small subproblems with iterative solvers.
The methods are very efficient for large scale inverse problems, they have
the advantage that various regularization approaches can be used, and they
can also incorporate methods to automatically estimate regularization
parameters.
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Last modified: April 11 2016 - 18:14:43