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Browsing by Author "Nicolls, Fred"

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3D model reconstruction using photoconsistency

Author: Joubert, Kirk Michael Date: 2007 Model reconstruction using photoconsistency refers to a method that creates a photohull, an approximate computer model, using multiple calibrated camera views of an object. The term photoconsistency refers to the concept that is used to ... Read more
Aircraft state estimation using cameras and passive radar

Author: De Charmoy, Benjamin Date: 2018 Multiple target tracking (MTT) is a fundamental task in many application domains. It is a difficult problem to solve in general, so applications make use of domain specific and problem-specific knowledge to approach the problem by solving ... Read more
Automated 3D reconstruction of Lodox Statscan images for forensic application

Author: Bolton, Frank Date: 2011 The main objectives of this project are to perform tomographic reconstruction with manually scanned projection data from a Lodox Statscan full body digital radiography system, and to produce tools to allow automated generation of information ... Read more
Automatic 2D-to-3D conversion of single low depth-of-field images

Author: Reddy, Serendra Date: 2017 This research presents a novel approach to the automatic rendering of 3D stereoscopic disparity image pairs from single 2D low depth-of-field (LDOF) images. Initially a depth map is produced through the assignment of depth to every delineated ... Read more
Automatic detection and segmentation of brain lesions from 3D MR and CT images

Author: Mokhomo, Molise Date: 2014 The detection and segmentation of brain pathologies in medical images is a vital step which helps radiologists to diagnose a variety of brain abnormalities and set up a suitable treatment. A number of institutes such as iThemba LABS still ... Read more
Automation of region specific scanning for real time medical systems

Author: Wong, Denis Kow Son Date: 2012 X-rays have played a vital role in both the medical and security sectors. However, there is a limit to the amount of radiation a body can receive before it becomes a health risk. Modern low dose x-ray devices operate using a c-arm which moves ... Read more
Calibration, recognition, and shape from silhouettes of stones

Author: Forbes, Keith Date: 2007 Multi-view shape-from-silhouette systems are increasingly used for analysing stones. This thesis presents methods to estimate stone shape and to recognise individual stones from their silhouettes. Calibration of two image capture setups is ... Read more
The characterisation and automatic classification of transmission line faults

Author: Minnaar, Ulrich Date: 2014 A country's ability to sustain and grow its industrial and commercial activities is highly dependent on a reliable electricity supply. Electrical faults on transmission lines are a cause of both interruptions to supply and voltage dips. These ... Read more
Coded aperture and coded exposure photography : an investigation into applications and methods

Author: Wilson, Martin Date: 2011 This dissertation presents an introduction to the field of computational photography, and provides a survey of recent research. Specific attention is given to coded aperture and coded exposure theory and methods, as these form the basis for ... Read more
Designing hypothesis tests for digital image matching

Author: Cox, Gregory Sean Date: 2000 Image matching in its simplest form is a two class decision problem. Based on the evidence in two sensed images, a matching procedure must decide whether they represent two views of the same scene, or views of two different scens. Previous ... Read more
Digital video moving object segmentation using tensor voting: A non-causal, accurate approach

Author: Guest, Ian Date: 2009 Motion based video segmentation is important in many video processing applications such as MPEG4. This thesis presents an exhaustive, non-causal method to estimate boundaries between moving objects in a video clip. It make use of tensor voting ... Read more
Evaluation of optimal control-based deformable registration model

Author: Matjelo, Naleli Jubert Date: 2014 The deformable image registration is central to many challenges in medical imaging applications. The basic idea of the deformable image registration problem is to find an approximation of a reasonable deformation which transforms one image ... Read more
Gesture recognition with application to human-robot interaction

Author: Mangera, Ra'eesah Date: 2015 Gestures are a natural form of communication, often transcending language barriers. Recently, much research has been focused on achieving natural human-machine interaction using gestures. This dissertation presents the design of a gestural ... Read more
Image and video segmentation using graph cuts

Author: Kulkarni, Mayuresh Date: 2010 Includes abstract. Includes bibliographical references (leaves 67-71). Read more
Image registration and its application to computer vision : mosaicing and independant motion detection

Author: Nkanza, Ntana Date: 2005 Image registration enables the geometric alignment of two images and is widely used in various applications in the fields of remote sensing, medical imaging and computer vision. This thesis explores each of the stages, and looks at two ... Read more
Investigation into the use of the Microsoft Kinect and the Hough transform for mobile robotics

Author: O'Regan, Katherine Date: 2014 The Microsoft Kinect sensor is a low cost RGB-D sensor. In this dissertation, its calibration is fully investigated and then these parameters are compared to the parameters given by Microsoft and OpenNI. The parameters found were found to be ... Read more
Locating facial features with active shape models

Author: Milborrow, Stephen Date: 2007 This dissertation focuses on the problem of locating features in frontal views of upright human faces. The dissertation starts with the Active Shape Model of Cootes et al. [19] and extends it with the following techniques: 1. Selectively using ... Read more
Proceedings of the Fifteenth Annual Symposium of the Pattern Recognition Association of South Africa

Author: Nicolls, Fred Date: 2004 This paper describes an attempt to reconstruct a 3-D object from a set of 35 images captured using a scanning electron microscope. Point matching over overlapping triples of views is used to obtain an initial reconstruction, which is refined ... Read more
Reducing the Burden of Aerial Image Labelling Through Human-in-the-Loop Machine Learning Methods

Author: Razzak, Muhammed T Date: 2021 This dissertation presents an introduction to human-in-the-loop deep learning methods for remote sensing applications. It is motivated by the need to decrease the time spent by volunteers on semantic segmentation of remote sensing imagery. ... Read more
Shape from Shading Using MRF Optimization with Gibbs Sampling with Quadruplet Cliques

Author: Louw, Markus ; Nicolls, Fred Date: 2008 This paper extends the MRF formulation approach developed solving the shape from shading problem. Our method extends the Gibbs sampling approach to solve an MRF formulation which characterizes the Shape from Shading (SFS) problem under ... Read more