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Browsing by Subject "Image classification"

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Bilge dump automatic alert system in southern Africa oceans

Author: Mdakane, Lizwe W ; Meyer, Rory GV ; Sibolla, Bolelang H Date: Aug 2020 Oil spill over the sea surface formed because of oil-tanker accidents or illegal bilge dumping of tankers can cause significant environmental damage depending on the location and amount. The international legislation contains minor and ... Read more
Comparing three spaceborne optical sensors via fine scale pixel-based urban land cover classification products

Author: Breytenbach, Andre ; Eloff, C ; Pretorius, E Date: Aug 2013 Accessibility to higher resolution earth observation satellites suggests an improvement in the potential for fine scale image classification. In this comparative study, imagery from three optical satellites (WorldView-2, Pléiades and RapidEye) ... Read more
The effects of shadow removal on across-date settlement type classification of quickbird images

Author: Luus, FPS ; Van den Bergh, F ; Maharaj, BTJ Date: Jul 2012 QuickBird imagery acquired on separate dates may have significant differences in viewing- and illumination geometries, which can negatively impact across-date settlement type classification accuracy. The effect of cast shadows on classification ... Read more
Effects of viewing- and illumination geometry on settlement type classification of quickbird images

Author: Van den Bergh, F Date: Jul 2011 Image texture features extracted from high-resolution remotely sensed images over urban areas have shown promise in their ability to distinguish different settlement classes. Without any explicit mechanism to counter the effects of variable ... Read more
Land-cover separability analysis of MODIS time-series data using a combined simple harmonic oscillator and a mean reverting stochastic process

Author: Grobler, TL ; Ackermann, ER ; Olivier, JC ; Van Zyl, AJ ; Kleynhans, W Date: Jun 2012 It is proposed that the time series extracted from moderate resolution imaging spectroradiometer satellite data be modeled as a simple harmonic oscillator with additive colored noise. The colored noise ismodeled with an Ornstein–Uhlenbeck ... 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
Towards a complete rule-based classification approach for flat fingerprints

Author: Webb, L ; Mathekga, Mmamolatelo E Date: Dec 2014 Biometrics, particularly fingerprints, are becoming widely used in the information security field due to the fact that they cannot be lost or stolen as easily as a password or Personal Identification Number (PIN). A challenge with the use of ... Read more

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Browsing by Subject "Image classification"

Browsing by Subject "Image classification"

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