Bilevel Parameter Learning for Higher-Order Total Variation Regularisation Models

J. C. De los Reyes, C. -B. Schonlieb, Tuomo Valkonen

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

We consider a bilevel optimisation approach for parameter learning in higher-order total variation image reconstruction models. Apart from the least squares cost functional, naturally used in bilevel learning, we propose and analyse an alternative cost based on a Huber-regularised TV seminorm. Differentiability properties of the solution operator are verified and a first-order optimality system is derived. Based on the adjoint information, a combined quasi-Newton/semismooth Newton algorithm is proposed for the numerical solution of the bilevel problems. Numerical experiments are carried out to show the suitability of our approach and the improved performance of the new cost functional. Thanks to the bilevel optimisation framework, also a detailed comparison between (Formula presented.) and (Formula presented.) is carried out, showing the advantages and shortcomings of both regularisers, depending on the structure of the processed images and their noise level.
Original languageEnglish (US)
Pages (from-to)1-25
Number of pages25
JournalJOURNAL OF MATHEMATICAL IMAGING AND VISION
Volume57
Issue number1
DOIs
StatePublished - Jun 1 2016
Externally publishedYes

ASJC Scopus subject areas

  • Modeling and Simulation
  • Geometry and Topology
  • Applied Mathematics
  • Computer Vision and Pattern Recognition
  • Statistics and Probability
  • Condensed Matter Physics

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