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Learning filter functions in regularisers by minimising quotients

Accepted version
Peer-reviewed

Type

Conference Object

Change log

Authors

Gilboa, G 
Grah, JS 
Schoenlieb, Carola-Bibiane  ORCID logo  https://orcid.org/0000-0003-0099-6306

Abstract

Learning approaches have recently become very popular in the field of inverse problems. A large variety of methods has been established in recent years, ranging from bi-level learning to high-dimensional machine learning techniques. Most learning approaches, however, only aim at fitting parametrised models to favourable training data whilst ignoring misfit training data completely. In this paper, we follow up on the idea of learning parametrised regularisation functions by quotient minimisation as established in [3]. We extend the model therein to include higher-dimensional filter functions to be learned and allow for fit- and misfit-training data consisting of multiple functions. We first present results resembling behaviour of well-established derivative-based sparse regularisers like total variation or higher-order total variation in one-dimension. Our second and main contribution is the introduction of novel families of non-derivative-based regularisers. This is accomplished by learning favourable scales and geometric properties while at the same time avoiding unfavourable ones.

Description

Keywords

Regularisation learning, Non-linear eigenproblem, Sparse regularisation, Generalised inverse power method

Journal Title

Lecture Notes in Computer Science

Conference Name

SVM 2017 : 6th Conference on Scale Space and Variational Methods in Computer Vision

Journal ISSN

0302-9743
1611-3349

Volume Title

10302 LNCS

Publisher

Springer Nature
Sponsorship
Engineering and Physical Sciences Research Council (EP/M00483X/1)
Leverhulme Trust (ECF-2016-611)
Isaac Newton Trust (1608(aj))
Leverhulme Trust (RPG-2015-250)
Engineering and Physical Sciences Research Council (EP/N014588/1)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (691070)
Alan Turing Institute (unknown)
Engineering and Physical Sciences Research Council (EP/J009539/1)
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