PURIFY: a new approach to radio-interferometric imaging

Rafael E Carrillo, Jason D McEwen, Yves Wiaux

Research output: Contribution to journalArticle

70 Citations (Scopus)
134 Downloads (Pure)

Abstract

In a recent paper series, the authors have promoted convex optimization algorithms for radio- interferometric imaging in the framework of compressed sensing, which leverages sparsity regularization priors for the associated inverse problem and defines a minimization problem for image reconstruction. This approach was shown, in theory and through simulations in a simple discrete visibility setting, to have the potential to outperform significantly CLEAN and its evolu- tions. In this work, we leverage the versatility of convex optimization in solving minimization problems to both handle realistic continuous visibilities and offer a highly parallelizable struc- ture paving the way to significant acceleration of the reconstruction and high-dimensional data scalability. The new algorithmic structure promoted relies on the simultaneous-direction method of multipliers (SDMM) and contrasts with the current major–minor cycle structure of CLEAN and its evolutions, which in particular cannot handle the state-of-the-art minimization problems under consideration where neither the regularization term nor the data term are differentiable functions. We release a beta version of an SDMM-based imaging software writ- ten in C and dubbed PURIFY (http://basp-group.github.io/purify/) that handles various sparsity priors, including our recent average sparsity approach sparsity averaging reweighted analysis (SARA). We evaluate the performance of different priors through simulations in the continuous visibility setting, confirming the superiority of SARA.
Original languageEnglish
Pages (from-to)3591-3604
JournalMonthly Notices of the Royal Astronomical Society
Volume439
Issue number4
Early online date28 Feb 2014
DOIs
Publication statusPublished - 2014

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