Joint image reconstruction and segmentation using the Potts model. (21st January 2015)

• Record Type: Journal Article
• Authors: Storath, Martin; Weinmann, Andreas; Frikel, Jürgen; Unser, Michael
• Is Part Of: Inverse problems. Volume 31:Number 2(2015:Feb.)
• Publication Date: 2015-01-21
• Subjects: Potts model -- piecewise-constant Mumford–Shah model -- image segmentation -- Radon transform -- spherical Radon transform -- photoacoustic tomography; Inverse problems (Differential equations) -- Periodicals; 515.357
• DOI: 10.1088/0266-5611/31/2/025003
• Languages: English
• ISSNs: 0266-5611

Abstract

Abstract: We propose a new algorithmic approach to the non-smooth and non-convex Potts problem (also called piecewise-constant Mumford–Shah problem) for inverse imaging problems. We derive a suitable splitting into specific subproblems that can all be solved efficiently. Our method does not require a priori knowledge on the gray levels nor on the number of segments of the reconstruction. Further, it avoids anisotropic artifacts such as geometric staircasing. We demonstrate the suitability of our method for joint image reconstruction and segmentation. We focus on Radon data, where we in particular consider limited data situations. For instance, our method is able to recover all segments of the Shepp–Logan phantom from seven angular views only. We illustrate the practical applicability on a real positron emission tomography dataset. As further applications, we consider spherical Radon data as well as blurred data.