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Browsing Other Publications by Department "Department of Electrical Engineering"

Now showing items 1-13 of 13

A comparison of three class separability measures

Author: Mthembu, N S ; Greene, J R Date: 2004 Measures of class separability can provide valuable insights into data, and suggest promising classification algorithms and approaches in data mining. We compare three simple class separability measures used in supervised machine learning. ... Read more
A simple method for visualizing labelled and unlabelled data in high-dimensional spaces

Author: Greene, J R Date: 2004 The low-dimensional visualisation of highdimensional data is a valuable way of detecting structure (such as clusters, and the presence of outliers) in the data, and avoiding some of the pitfalls of blind data manipulation. Projection based ... Read more
Benefits and requirements of interworking between wirelessLAN and 3G wireless

Author: Chan, H Anthony Date: 2004 The IEEE 802.11 family of WirelessLAN enable broadband wireless access at low cost but has limited distance range. The 3G Wireless network enable wireless data access over much longer distance of cellular sites and with the handover and roaming ... Read more
Electricity for all in South Africa: The need and the means

Author: Dingley, C E Date: 1990 Read more
Evaluating microphone arrays for a speaker identification task

Author: Zulu, Nicholas ; Mashao, Daniel Date: 2004 Abstract—Microphone array systems have been an area of active research for several years. The potential for high quality hands-free speech acquisition in noisy and reflecting environments makes microphone arrays an attractive alternative to ... Read more
Increased diphone recognition for an Afrikaans TTS system

Author: Rousseau, Francois ; Mashao, Daniel Date: 2004 In this paper we discuss the implementation of an Afrikaans TTS system that is based on diphones. Using diphones makes the system flexible but presents other challenges. A previous effort to design an Afrikaans TTS system was done by SUN. ... Read more
Inverse synthetic aperture imaging using 140 kHz ultrasonic laboratory sonar

Author: Wilkinson, A J ; Mukhopadhyay, P K ; Lewitton, N ; Inggs, M R Date: 2004 A sonar system operating at 40 kHz in air has been developed to allow the capture of acoustic data in a laboratory environment. The system can serve as a teaching tool for students in seismology, sonar and radar, as well as a useful tool for ... Read more
Matching feature distributions for the Robust Speaker Verification

Author: Mashao, D J Date: 2004 In this work we improve the performance of a speaker verification system by matching the feature vector distributions obtained when training and testing the system. In particular, we perform experiments using speech that has been degraded by ... 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
Texture measures for improved watershed segmentation of froth images

Author: Nicolls, F (Editor) Date: 2004 Luc Vincent’s fast watershed algorithm has been successfully applied to determine the bubble size distribution in an image of froth when the bubbles are all of similar size [1]. This technique fails to work successfully when the image contains ... Read more
The detection and tracking of GSM portable handsets using a 5-element circular array

Author: Lambert-Porter, J R ; Wilkinson, A J Date: 2004 Direction Finding (DF) is a process that involves estimating the directions of the arrival (DOA) for propagating wavefronts impinging on an antenna array from arbitrary directions relative to that antenna array. GSM, the Global System for ... Read more
Using high-level feature concentration for speaker identification

Author: Appana, Brodwyn L ; Skosan, Marshalleno ; Mashao, Daniel J Date: 2004 Traditional and current speaker recognition systems primarily use low-level (physiological) features of speech that model the physical dimensions of the vocal tract. The popular MFCC is such a feature vector. There is a growing trend in the ... Read more
Visual hull surface estimation

Author: Milne, Phillip ; Nicolls, Fred ; De Jager, Gerhard Date: 2004 This paper describes a technique used to approximate the surface of an object’s visual hull. The hull’s basic structure is initially represented by a partitioned 3D space using voxels. The marching cubes algorithm then assigns polygonal patches ... Read more