New second order Mumford-Shah model based on Γ-convergence approximation for image processing

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

External organisations

  • University of Nottingham
  • Qingdao University

Abstract

In this paper, a second order variational model named the Mumford-Shah total generalized variation (MSTGV) is proposed for simultaneously image denoising and segmentation, which combines the original Γ-convergence approximated Mumford-Shah model with the second order total generalized variation (TGV). For image denoising, the proposed MSTGV can eliminate both the staircase artefact associated with the first order total variation and the edge blurring effect associated with the quadratic H1 regularization or the second order bounded Hessian regularization. For image segmentation, the MSTGV can obtain clear and continuous boundaries of objects in the image. To improve computational efficiency, the implementation of the MSTGV does not directly solve its high order nonlinear partial differential equations and instead exploits the efficient split Bregman algorithm. The algorithm benefits from the fast Fourier transform, analytical generalized soft thresholding equation, and Gauss-Seidel iteration. Extensive experiments are conducted to demonstrate the effectiveness and efficiency of the proposed model.

Details

Original languageEnglish
Pages (from-to)641-647
Number of pages7
JournalInfrared Physics and Technology
Volume76
Early online date23 Apr 2016
Publication statusPublished - 1 May 2016

Keywords

  • Bounded Hessian regularization, Fast Fourier transform, Image denoising, Image segmentation, Mumford-Shah model, Split Bregman algorithm, Total generalized variation, Γ-convergence approximation