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Browsing by Author "Schwegmann, CP"

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Bilge dump detection from SAR imagery using local binary patterns

Author: Mdakane, LW ; Kleynhans, W ; Schwegmann, CP Date: Jul 2015 Accidental or deliberate bilge dumping presents a major threat to the sea ecosystem. We present a semi automatic approach to detect bilge dumping in synthetic aperture radar (SAR) images. The approach consist of three main parts. Firstly, ... Read more
A CA-CFAR and localized wavelet ship detector for sentinel-1 imagery

Author: Schwegmann, CP ; Kleynhans, W ; Salmon, BP ; Mdakane, L Date: Jul 2015 The Maritime Domain Awareness initiative seeks to constantly improve the ways in which maritime information is collected. With the recent release of free Sentinel-1 imagery to the public, monitoring the maritime environment has become a more ... Read more
Manifold adaptation for constant false alarm rate ship detection in South African oceans

Author: Schwegmann, CP ; Kleynhans, W ; Salmon, BP Date: Apr 2015 The detection of ships at sea is a difficult task made more so by uncooperative ships, especially when using transponder based ship detection systems. Synthetic Aperture Radar imagery provides a means of observation independent of the ships ... Read more
A multi-tier higher order Conditional Random Field for land cover classification of multi-temporal multi-spectral Landsat imagery

Author: Salmon, BP ; Kleynhans, W ; Olivier, JC ; Schwegmann, CP ; Olding, WC Date: Jul 2015 In this paper the authors present a 2-tier higher order Conditional Random Field which is used for land cover classification. The Conditional Random Field is based on probabilistic messages being passed along a graph to compute efficiently ... Read more
Proper comparison among methods using a confusion matrix

Author: Salmon, BP ; Kleynhans, W ; Schwegmann, CP ; Olivier, JC Date: Jul 2015 An important aspect of research in the remote sensing field is to objectively compare different classifiers. This is the foundation of hundreds of research projects and in this paper we will address some raising concerns when evaluating ... Read more
Ship detection in Sentinel-1 imagery using the h-dome transformation

Author: Schwegmann, CP ; Kleynhans, W ; Salmon, BP ; Mdakane, L Date: Jul 2015 The ability to reliably detect ships within the ocean is one of the core capabilities of Maritime Domain Awareness. Constant improvements are pursued in both computational speed and reliable responses to events by exploring new ship detection ... Read more
Ship detection in South African oceans using a combination of SAR and historic LRIT data

Author: Kleynhans, W ; Salmon, BP ; Schwegmann, CP ; Seotlo, MV Date: Jul 2013 Regular surveillance of territorial sea areas is increasingly important for coastal nations as these marine areas are a valuable economic resource (e.g. for fisheries or oil extraction). The responsibility for the administration, law enforcement, ... Read more
Ship detection in South African oceans using SAR, CFAR and a Haar-like feature classifier

Author: Schwegmann, CP ; Kleynhans, W ; Salmon, BP Date: Jul 2014 Synthetic Aperture Radar images is a proven technology that can be used to detect ships at sea which have no active transponders (commonly referred to as dark targets). Various methods have been proposed that process SAR images to monitor ... Read more
Simulated annealing CFAR threshold selection for South African ship detection in ASAR imagery

Author: Schwegmann, CP ; Kleynhans, W ; Salmon, BP Date: Jul 2014 Synthetic Aperture Radar images are able to detect ships that would be hidden to tradition ship tracking methods due to their transponders being turned off. Using a SAR image as input, the CFAR method can highlight these ships given a correctly ... Read more
Synthetic aperture radar for maritime domain awareness: Ship detection in a South African context

Author: Schwegmann, CP ; Kleynhans, W Date: Oct 2014 Maritime Domain Awareness is an initiative started to help each sea-bordering country improve its understanding of its Exclusive Economic Zone. A country that improves its Maritime Domain Awareness ensures that activities such as piracy and ... Read more

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Browsing by Author "Schwegmann, CP"

Browsing by Author "Schwegmann, CP"

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