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Browsing by Author "Nicolls, F"

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Active object recognition using vocabulary trees

Author: Govender, Nicolin ; Claassens, J ; Nicolls, F ; Warrell, J Date: Jan 2013 For mobile robots to perform certain tasks in human environments, fast and accurate object classification is essential. Actively exploring objects by changing viewpoints promises an increase in the accuracy of object classification. This paper ... Read more
Alternative confidence measure for local matching stereo algorithms

Author: Ndhlovu, T ; Nicolls, F Date: Nov 2009 The authors present a confidence measure applied to individual disparity estimates in local matching stereo correspondence algorithms. It aims at identifying textureless areas, where most local matching algorithms fail. The confidence measure ... Read more
Cascading neural networks for upper-body gesture recognition

Author: Mangera, R ; Senekal, F ; Nicolls, F Date: 2014 Gesture recognition has many applications ranging from health care to entertainment. However for it to be a feasible method of human-computer interaction it is essential that only intentional movements are interpreted and that the system can ... Read more
Cross-dataset performance evaluation of deep learning distracted driver detection algorithms

Author: Zandamela, Frank ; Ratshidaho, Terence ; Nicolls, F ; Stoltz, George G Date: Nov 2022 Deep learning has gained traction due its supremacy in terms of accuracy and ability to automatically learn features from input data. However, deep learning algorithms can sometimes be flawed due to many factors such as training dataset, ... Read more
Effects of lens distortion calibration patterns on the accuracy of monocular 3D measurements

Author: De Villiers, J ; Wilson, F ; Nicolls, F Date: Nov 2011 A variety of lens distortion modelling techniques exist. Since they make use of different calibration metrics it is difficult to select one over the others. This work aims to compare lens distortion modelling techniques and calibration patterns ... Read more
Implementation of adaptive coded aperture imaging using a digital micro-mirror device for defocus deblurring

Author: Chiranjan, Ashill ; Duvenhage, Bernardt ; Nicolls, F Date: Dec 2016 Digital image processing (DIP) and computational photography are ever growing fields with new focuses on coded aperture imaging and its real world applications. Traditional coded aperture imaging systems consisted of statically coded masks ... Read more
An Optical tracker for the maritime environment

Author: Bachoo, AK ; Le Roux, F ; Nicolls, F Date: Apr 2011 Optical (visual) tracking is an important research area in computer vision with a wide range of useful and critical applications in defence and industry. The tracking of targets that pose a threat or potential threat to a country's assets and ... Read more
Probabilistic active recognition of multiple objects using Hough-based geometric matching features

Author: Govender, Natasha ; Warrell, J ; Keaikitse, M ; Torr, P ; Nicolls, F Date: 2015 Bayesian methods have proved effective in many active sensing scenarios, including object recognition from a mobile platform, tracking and medical diagnostics. Despite its importance though, models for active object recognition have concentrated ... Read more
Probabilistic models for 2D active shape recognition using Fourier descriptors and mutual information

Author: Govender, Natasha ; Warrell, J ; Torr, P ; Nicolls, F Date: Aug 2014 Shape recognition is essential for robots to perform tasks in both human and industrial environments. Many algorithms have been developed for shape recognition with varying results. However, few of the proposed methods actively look for ... Read more
Probabilistic object and viewpoint models for active object recognition

Author: Govender, Natasha ; Warrell, J ; Torr, P ; Nicolls, F Date: Sep 2013 For mobile robots to perform certain tasks in human environments, fast and accurate object verification and recognition is essential. Bayesian approaches to active object recognition have proved effective in a number of cases, allowing ... Read more
Quantitative analysis of the improvement in high zoom maritime tracking due to real-time image enhancement

Author: Bachoo, AK ; De Villiers, JP ; Nicolls, F ; Le Roux, Francois PJ Date: Apr 2011 This work aims to evaluate the improvement in the performance of tracking small maritime targets due to real-time enhancement of the video streams from high zoom cameras on pan-tilt pedestal. Due to atmospheric conditions these images can ... Read more
Range and intensity vision for rock-scene segmentation

Author: Mkwelo, Simpiwe ; Nicolls, F ; De Jager, G Date: Nov 2007 This paper presents another approach to segmenting a scene of rocks on a conveyor belt for the purposes of measuring rock size. Rock size estimation instruments are used to monitor, optimize and control milling and crushing in the mining ... Read more
Range sections as rock models for intensity rock scene segmentation

Author: Mkwelo, Simpiwe ; De Jager, G ; Nicolls, F Date: Nov 2007 This paper presents another approach to segmenting a scene of rocks on a conveyor belt for the purposes of measuring rock size. Rock size estimation instruments are used to monitor, optimize and control milling and crushing in the mining ... Read more
A study of the sensitivity of long-range passive ranging techniques to atmospheric scintillation

Author: De Villiers, J ; Wilson, F ; Nicolls, F Date: Apr 2012 This work aims to quantify and improve the sensitivity of monocular passive ranging techniques in sequences that are degraded by the the quasi-periodic inter frame motion and localised blurring associated with atmospheric scintillation. Ranges ... Read more
A study on the effect of different image centres on stereo triangulation accuracy

Author: De Villiers, J ; Jermy, R ; Nicolls, F Date: Nov 2015 This paper evaluates the effect of mixing the distortion centre, principal point and arithmetic image centre on the distortion correction, focal length determination and resulting real-world stereo vision triangulation. A robotic arm is used ... Read more
A study on the sensitivity of photogrammetric camera calibration and stitching

Author: De Villiers, J ; Nicolls, F Date: Nov 2014 This paper presents a detailed simulation study of an automated robotic photogrammetric camera calibration system. The system performance was tested for sensitivity with regard to noise in the robot movement, camera mounting and image processing ... Read more
Using temporal seeding to constrain the disparity search range in stereo matching

Author: Ndhlovu, T ; Nicolls, F Date: Nov 2011 In a stereo image sequence, finding feature correspondences is normally done for every frame without taking temporal information into account. Reusing previous computations can add valuable information. A temporal seeding technique is developed ... Read more
A versatile photogrammetric camera automatic calibration suite for multi-spectral fusion and optical helmet tracking

Author: De Villiers, J ; Jermy, R ; Nicolls, F Date: May 2014 This paper presents a system to determine the photogrammetric parameters of a camera. The lens distortion, focal length and camera six degree of freedom (DOF) position are calculated. The system caters for cameras of different sensitivity ... Read more

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