Facet-Based Regularization for Scalable Radio-Interferometric Imaging

Shahrzad Naghibzadeh, Audrey Repetti, Alle-Jan van der Veen, Yves Wiaux

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

Current and future radio telescopes deal with large volumes of data and are expected to generate high resolution gigapixel-size images. The imaging problem in radio interferometry is highly ill-posed and the choice of the prior model of the sky is of utmost importance to guarantee a reliable reconstruction. Traditionally, one or more regularization terms (e.g. sparsity and positivity) are applied for the complete image. However, radio sky images can often contain individual source clusters in a large empty background. Exploiting this observation, we propose a smarter regularization term. More precisely, we propose to divide radio images into source occupancy regions (facets) and apply relevant regularizing assumptions for each facet. Leveraging a stochastic primal dual algorithm, we show the potential merits of applying facet-based regularization on the radio-interferometric images which results in both computation time and memory requirement savings.
Original languageEnglish
Title of host publicationEUSIPCO 2018
PublisherIEEE
Publication statusAccepted/In press - 18 May 2018
Event26th European Signal Processing Conference 2018 - Rome, Italy
Duration: 3 Sep 20187 Sep 2018

Conference

Conference26th European Signal Processing Conference 2018
Abbreviated titleEUSIPCO 2018
CountryItaly
CityRome
Period3/09/187/09/18

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  • Cite this

    Naghibzadeh, S., Repetti, A., van der Veen, A-J., & Wiaux, Y. (Accepted/In press). Facet-Based Regularization for Scalable Radio-Interferometric Imaging. In EUSIPCO 2018 IEEE.