Iterative Potts and Blake-Zisserman minimization for the recovery of functions with discontinuities from indirect measurements

Signals with discontinuities appear in many problems in the applied sciences ranging from mechanics, electrical engineering to biology and medicine. The concrete data acquired are typically discrete, indirect and noisy measurements of some quantities describing the signal under consideration. The task is to restore the signal and, in particular, the discontinuities. In this respect, classical methods perform rather poor, whereas non-convex non-smooth variational methods seem to be the correct choice. Examples are methods based on Mumford-Shah and piecewise constant Mumford-Shah functionals and discretized versions which are known as Blake-Zisserman and Potts functionals. Owing to their non-convexity, minimization of such functionals is challenging. In this paper, we propose a new iterative minimization strategy for Blake-Zisserman as well as Potts functionals and a related jump-sparsity problem dealing with indirect, noisy measurements. We provide a convergence analysis and underpin our findings with numerical experiments.


Published in:
Proceedings Of The Royal Society A-Mathematical Physical And Engineering Sciences, 471, 2176, 20140638
Year:
2015
Publisher:
London, Royal Soc
ISSN:
1364-5021
Keywords:
Laboratories:




 Record created 2015-05-29, last modified 2018-09-25

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