Exploring three faint source detections methods for aperture synthesis radio images
dc.contributor.author
dc.date.accessioned
2015-12-11T12:37:55Z
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2015-12-11T12:37:55Z
dc.date.issued
2015
dc.identifier.issn
1384-1076
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dc.description.abstract
Wide-field radio interferometric images often contain a large population of faint compact sources. Due to their low intensity/noise ratio, these objects can be easily missed by automated detection methods, which have been classically based on thresholding techniques after local noise estimation. The aim of this paper is to present and analyse the performance of several alternative or complementary techniques to thresholding. We compare three different algorithms to increase the detection rate of faint objects. The first technique consists of combining wavelet decomposition with local thresholding. The second technique is based on the structural behaviour of the neighbourhood of each pixel. Finally, the third algorithm uses local features extracted from a bank of filters and a boosting classifier to perform the detections. The methods' performances are evaluated using simulations and radio mosaics from the Giant Metrewave Radio Telescope and the Australia Telescope Compact Array. We show that the new methods perform better than well-known state of the art methods such as SExtractor, SAD and DUCHAMP at detecting faint sources of radio interferometric images
dc.description.sponsorship
This work has been supported by Grant AYA2010-21782-C03-02 from Ministerio de Economia y Competitividad. M. Masias holds an FI grant 2012FI_B1 00122. We thank the staff of the GMRT that made these observations possible
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application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
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info:eu-repo/grantAgreement/MICINN//AYA2010-21782-C03-02/ES/FENOMENOS DE ALTA ENERGIA EN OBJETOS ESTELARES. ANALISIS DE IMAGENES MULTILONGITUD DE ONDA PARA LA DETECCION Y CARACTERIZACION DE FUENTES./
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Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.newast.2014.10.006
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© New Astronomy, 2015, vol. 36, p. 86-99
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Articles publicats (D-ATC)
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Tots els drets reservats
dc.title
Exploring three faint source detections methods for aperture synthesis radio images
dc.type
info:eu-repo/semantics/article
dc.rights.accessRights
info:eu-repo/semantics/embargoedAccess
dc.embargo.terms
Cap
dc.date.embargoEndDate
info:eu-repo/date/embargoEnd/2026-01-01
dc.type.version
info:eu-repo/semantics/publishedVersion
dc.identifier.doi
dc.identifier.idgrec
022850
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dc.relation.ProjectAcronym