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Browsing by Subject "Image processing"

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Application of drones and image processing for bridge inspections in South Africa

Author: Kemp, Lana ; Roux, Michael P ; Kemp, Mauritz J ; Kock, R Date: Jul 2021 In South Africa, visual inspections for all bridge structures are required every five years. A need was identified to establish if it would be practical to utilise technologies, such as drones and photogrammetry, to improve inspections and ... Read more
Automated spoof-detection for fingerprints using optical coherence tomography

Author: Darlow, LN ; Webb, L ; Botha, N Date: May 2016 Fingerprint recognition systems are prevalent in high-security applications. As a result, the act of spoofing these systems with artificial fingerprints is of increasing concern. This research presents an automatic means for spoof-detection ... Read more
Edge-preserving smoothing filters for improving object classification

Author: Skosana, Vusi J ; Kunene, Dumisani C Date: Sep 2019 Edge-preserving smoothing filters have had many applications in the image processing community, such as image compression, restoration, deblurring and abstraction. However, their potential application in computer vision and machine learning ... Read more
Enabling user-oriented features at the edge: A case of an IoT-based smart shopping cart

Author: Heyns, R ; Ndiaye, M ; Abu-Mahfouz, Adnan MI Date: Jun 2021 In this work, we proposed an automated smart cart system for use in the shopping industry. A smart cart equipped with sensors and computing resources would classify as an edge device for the Industrial Internet of Things (IIoT). In our design ... Read more
Evaluating the change of directional patterns for fingerprints with missing singular points under rotation

Author: Dorasamy, Kribashnee ; Webb-Ray, Leandra ; Tapamo, J-R Date: Dec 2016 Overcoming small inter-class variation when fingerprints have missing singular points (SPs) is one of the current challenges faced in fingerprint classification, since class information is scarce. Grouping the orientation fields to form ... Read more
Evaluation of pavement response instrumentation

Author: Vogel, F ; Steyn, WJvdM Date: Mar 2000 The report focuses on aspects such as possible wireless data transmission, standardization and mesurement methodologies and sensor technology. Various avenues are explored for the development of sensors while new emerging technologies that ... Read more
Extended feature-fusion guidelines to improve image-based multi-modal biometrics

Author: Brown, Dane ; Bradshaw, K Date: Sep 2016 The feature-level, unlike the match score-level, lacks multi-modal fusion guidelines. This work demonstrates a practical approach for improved image-based biometric feature-fusion. The approach extracts and combines the face, fingerprint and ... Read more
Hybrid speckle de-noising filters for ultrasound images

Author: Sikhakhane, K ; Rimer, S ; Gololo, M ; Ouahada, K ; Abu-Mahfouz, Adnan MI Date: Sep 2023 Ultrasound imaging uses reflected echo signals from high-frequency sound waves transmitted into a body with high water content to create images of the internal soft tissue, bone, and blood flow. Different kinds of noise are introduced during ... Read more
Identifying individual fires from satellite-derived burned area data

Author: Archibald, S ; Roy, DP Date: Jul 2009 An algorithm for identifying individual fires from the Modis burned area data product is introduced for southern Africa. This algorithm gives the date of burning, size of fire, and location of the centroid for all fires identified over 8 years ... Read more
Image processing towards the automated identification of nanoparticles in SEM images

Author: Botha, Gerda N ; Wessels, Gert JC ; Botha, Natasha ; Van Eden, Beatrice Date: Jan 2019 SEM images are crucial in the characterisation of material properties. These images can be very hard to interpret without any prior knowledge of the material. This paper discusses a pre-processing method for assisting convolutional Neural ... Read more
Layer-wise powder deposition defect detection in additive manufacturing

Author: Hendriks, Adriaan J ; Ramokolo, Lesiba R ; Ngobeni, Christopher M ; Moroko, Matome C ; Naidoo, Darryl Date: Mar 2019 Additive manufacturing applications, in areas such as aerospace and medicine, are limited due to the lack of process stability and quality management. In particular, geometrical inaccuracies and the presence of mechanical defects hinder ... Read more
Pothole tagging system

Author: Joubert, D ; Tyatyantsi, A ; Mphahlehle, J ; Manchidi, V Date: Nov 2011 Potholes are not only a source of frustration to drivers but also negatively impact the economy due to damage to vehicles and costly road repairs. Regular and rapid pavement inspection and maintenance is key to preventing pothole formation ... Read more
QuickPALM: 3D real-time photoactivation nanoscopy image processing in ImageJ

Author: Henriques, R ; Lelek, M ; Fornasiero, EF ; Valtorta, F ; Zimmer, C ; Mhlanga, Musa Date: May 2010 QuickPALM in conjunction with the acquisition of control features provides a complete solution for the acquisition, reconstruction and visualization of 3D PALM or STORM images, achieving resolutions of ~40 nm in real time. This software package ... 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
Sinking organic particles in the ocean—Flux estimates from in situ optical devices

Author: Giering, SLC ; Cavan, EL ; Basedow, SL ; Briggs, N ; Burd, AB ; Darroch, LJ ; Guidi, L ; Irisson, JO ; Iverson, MH ; Thomalla, Sandy J Date: Feb 2020 Optical particle measurements are emerging as an important technique for understanding the ocean carbon cycle, including contributions to estimates of their downward flux, which sequesters carbon dioxide (CO2) in the deep sea. Optical instruments ... Read more
Supporting drivable region detection by minimising salient pixels generated through robot sensors

Author: Falola, O ; Osunmakinde, I ; Bagula, A Date: Nov 2010 The role of robots, automatically guided machines able to perform tasks on their own cannot be over emphasized. In particular, if robotic vehicles are to work effectively, the way they are required to perform their jobs and their ability to ... Read more
Uncertainty quantification for the extraction of informal roads from remote sensing images of South Africa

Author: Thiede, RN ; Fabris-Rotelli, IN ; Stein, A ; Debba, Pravesh ; Li, M Date: Nov 2019 Informal unpaved roads in developing countries arise naturally through human movement without government authorities being informed. These roads are not authorized nor maintained by council, nor reliably mapped in quality-controlled online ... Read more
Using satellite imagery to evaluate land-based camouflage assets

Author: Baumbach, J ; Lubbe, M Date: Feb 2006 A camouflage field trial experiment was conducted. For the experiment several targets were deployed along tree lines and in an open field. Some of the vehicles were deployed with a variety of camouflage nets, while others were left uncovered. ... Read more
Video processing project

Author: Globisch, R ; Ferguson, K Date: Mar 2009 Video processing source code for algorithms and tools used in software media pipelines (e.g. image scalers, colour converters, etc.) The currently available source code is written in C++ with their associated libraries and DirectShow- Filters. Read more
Visual surveying platform for the automated detection of road surface distresses

Author: Naidoo, T ; Joubert, D ; Chiwewe, T ; Tyatyantsi, A ; Rancati, B ; Mbizeni, A Date: Mar 2014 Road distresses, such as potholes and edge cracks, are not only a source of frustration to drivers but also negatively impact the economy due to damage to motor vehicles and costly road repairs. Regular and rapid pavement inspection and ... Read more

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