Hostname: page-component-77f85d65b8-zzw9c Total loading time: 0 Render date: 2026-04-22T05:09:23.009Z Has data issue: false hasContentIssue false

BREAKING THE COHERENCE BARRIER: A NEW THEORY FOR COMPRESSED SENSING

Published online by Cambridge University Press:  15 February 2017

BEN ADCOCK
Affiliation:
Department of Mathematics, Simon Fraser University, Burnaby BC, V5A 1S6, Canada; ben_adcock@sfu.ca
ANDERS C. HANSEN
Affiliation:
DAMTP, University of Cambridge, Cambridge CB3 0WA, UK; ach70@cam.ac.uk, cmhsp2@cam.ac.uk, abr28@cam.ac.uk Department of Mathematics, University of Oslo, 0316 OSLO, Norway
CLARICE POON
Affiliation:
DAMTP, University of Cambridge, Cambridge CB3 0WA, UK; ach70@cam.ac.uk, cmhsp2@cam.ac.uk, abr28@cam.ac.uk
BOGDAN ROMAN
Affiliation:
DAMTP, University of Cambridge, Cambridge CB3 0WA, UK; ach70@cam.ac.uk, cmhsp2@cam.ac.uk, abr28@cam.ac.uk

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the 'Save PDF' action button.

This paper presents a framework for compressed sensing that bridges a gap between existing theory and the current use of compressed sensing in many real-world applications. In doing so, it also introduces a new sampling method that yields substantially improved recovery over existing techniques. In many applications of compressed sensing, including medical imaging, the standard principles of incoherence and sparsity are lacking. Whilst compressed sensing is often used successfully in such applications, it is done largely without mathematical explanation. The framework introduced in this paper provides such a justification. It does so by replacing these standard principles with three more general concepts: asymptotic sparsity, asymptotic incoherence and multilevel random subsampling. Moreover, not only does this work provide such a theoretical justification, it explains several key phenomena witnessed in practice. In particular, and unlike the standard theory, this work demonstrates the dependence of optimal sampling strategies on both the incoherence structure of the sampling operator and on the structure of the signal to be recovered. Another key consequence of this framework is the introduction of a new structured sampling method that exploits these phenomena to achieve significant improvements over current state-of-the-art techniques.

Information

Type
Research Article
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s) 2017