A comparison of constant false alarm rate object detection algorithms for iceberg identification in L- and C-band SAR imagery of the Labrador Sea
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Le résumé fourni par la source
Abstract. In this study, we pursue two objectives: first, we compare six different “constant false alarm rate” (CFAR) algorithms for iceberg detection in SAR images, and second, we investigate the effect of radar frequency by comparing the detection performance at C- and L-band. The SAR images were acquired over the Labrador Sea under melting conditions. In an overlapping optical Sentinel-2 image, 492 icebergs were identified in the area. They were used for an assessment of the algorithms' capabilities to accurately detect them in the SAR images and for the determination of the number of false alarms and missed detections. By testing the detectors at varying probability of false alarm (PFA) levels, the optimum PFA for each detector was found. Additionally, we considered the effect of iceberg sizes in relation to image resolution. The results showed that the overall highest accuracy was achieved by applying a log-normal CFAR detector to the L-band image (F score of 70.4 %), however, only for a narrow range of PFA values. Three of the tested detectors provided high F scores above 60 % over a wider range of PFA values both at L- and C-band. Low F scores were mainly caused by missed detections of small-sized (<60 m) and medium-sized (60–120 m) icebergs, with approximately 20 %–40 % of the medium icebergs and 85 %–90 % of small icebergs being missed by all detectors. The iDPolRAD detector, which is sensitive to volume scattering, is less suitable under melting conditions.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- A comparison of constant false alarm rate object detection algorithms for iceberg identification in L- and C-band SAR imagery of the Labrador Sea
- Date Crossref
- 15/12/2023
- Éditeur
- Copernicus GmbH
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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UiT The Arctic University of Norway pays non établi dans la noticeUniversité ou école supérieure
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Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung pays non établi dans la noticeStructure de recherche
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Norwegian Meteorological Institute pays non établi dans la noticeOrganisme public
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UiT – The Arctic University of Norway Department of Physics and Technology pays non établi dans la noticeUniversité ou école supérieure
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Alfred Wegener Institute pays non établi dans la noticeStructure de recherche
UiT The Arctic University of Norway, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung et Norwegian Meteorological Institute, avec 2 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.