Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 47 for “"field of view (FOV)"”.
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An Expected Entropy Reduction (EER) Approach to Target Tracking in Maritime Environment for On-board Camera
… piracy assault. On-board camera provides a way of monitoring suspicious activities at a low cost. However, the maritime environment poses challenges in detecting mobile targets because the water background is highly dynamic. This thesis addresses the problem of detecting and tracking mobile …
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Roughness Effects on Super Structures in Turbulent Boundary Layer Flows
This study investigates the influence of wall roughness on large-scale structures within turbulent boundary layers, using wall-parallel stereoscopic Particle Image Velocimetry (PIV) at a Reynolds number of 1.3 × 106m−1. The data was collected at a distance of = 2.8 from the wall under adverse = …
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A study of the thermal and optical characteristics of radiometric channels for earth radiation budget applications
… is then used to accurately simulate two types of dynamic solar observation: the solar calibration and the so-called pitchover maneuver. Using a second model, the nonscanner active cavity radiometer (ACR) thermal noise is studied. This study reveals that radiative emission and scattering by the …
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Design of a photonic crystal planar Luneburg lens for optical beam steering
… is an increasing demand for LIDAR in a variety of applications including autonomous vehicles, unammaned aerial vehicles (UAVs), robotics, and remote sensing. Ideal solutions are small in size, weight, and power consumption (SWaP) while maintaining long range, high resolution, and large field of …
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System Design and Implementation of the Virginia Tech Optical Satellite Tracking Telescope
… Telescope (VTOST) aims to test the feasibility of a commercial off-the-shelf (COTS) designed tracking system for Space Situational Awareness (SSA) data contribution. A novel approach is considered, combining two COTS systems, a high-powered telescope, built for astronomy purposes, and a larger …
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Stereo visual simultaneous localisation and mapping for an outdoor wheeled robot: a front-end study
… dependent on the context in which it is applied, often using heuristic and special cases to provide efficiency and robustness. It is thus crucial to identify the important parameters and factors regarding a particular context as this heavily influences the necessary algorithms, processes, and …
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Resolution improvement in optical microscopy by use of multi-beam interferometric illumination
… optical microscopy, the numerical aperture (NA) of the objective lens intrinsically links the resolution, depth of field (DOF), working distance (WD) and field of view (FOV). In a diffraction-limited system, changing the NA to improve resolution is not possible without degrading the other optical …
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Universal Usability of Virtual Reality
… and enjoyable for all users irrespective of their differences. This dissertation addresses two research themes that are concerned with the universal usability of VR.In the first theme, the gap in user experience quality between high-end VR platforms (PC VR) and low-end VR platforms (mobile …
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Theoretical and Experimental Evaluation of Spatial Resolution in a Variable Resolution X-Ray Computed Tomography Scanner
… tomography (CT) scanner can image objects of various sizes with greatly improved spatial resolution. The scanner employs an angulated discrete detector and achieves the resolution boost by matching the detector angulation to the scanner field of view (FOV) determined by the size of an …
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Design and Analysis of Telescope Receiver Systems for Future Far-Infrared Missions
The main topic of this thesis is the design and analysis of the Cosmic ORigins Explorer (CORE) telescope, a proposed mission for the ESA M5 mission call. Its focus was the study of the Cosmic Microwave Background (CMB), particularly its polarisation. An ambitious space mission, it would endeavour …
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Monte Carlo Simulations of Novel Scintillator Detectors and Dosimetry Calculations
… production and understanding the mechanisms of the radioresponse of tumor cells "in vitro" is of crucial importance as a first step before "in vivo" studies. The dosimetry of 188Re, used to target different lines of cancer cells, has been evaluated by the MC code GEANT4. The simulations …
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Computing Two-Dimensional Unambiguous Horizontal Wave Number Spectra From OH Airglow Images
… horizontal wave number spectrum from images of gravity wave perturbations in OH emission intensities is presented. The technique involves computing the $(\omega,\ k,\ l)=(\omega,\ h, \phi)$ spectrum of OH images collected over a period of several hours, where k is the zonal wave number, l is …
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Head mounted display architectures for 3D augmented reality
Augmented reality (AR) is the enhancement of our perception of the world around us. It promises the ability to simultaneously interact with a virtual environment and real objects, providing an intuitive method to interact with data. However, AR displays must be lightweight and compact, and be able …
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Coexistence of directional and non-directional technologies in 6G wireless dense networks
… networks are characterized by the prevalence of wireless access points (APs) in close proximity to a population of user devices on a similar scale. By increasing AP density, the aggregate data consumption of a system can be dramatically increased. In this dissertation we consider dense …
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Inverted compound eye camera for second generation MRI compatible SPECT system
In this work, we will evaluate a novel design of the second-generation MRI compatible SPECT system, MRC-SPECT-II, based on an inverted compound eye (ICE) gamma camera concept inspired by compound eyes often found in small invertebrates. The MRC-SPECT II system is constructed with a total of 24 …
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Visualisation and manipulation of 3D patient-specific bone geometry using augmented reality
… rehabilitation. Augmented reality (AR), a form of computer-mediated reality, uses an electronic display or projection module to add a hologram in the user's field of view (FOV). For intra-operative guidance, AR could aid in reducing the cognitive overload experienced by clinicians due to …
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On the role of warm rain clouds in the tropics
… that have been deconvolved to the 19-GHz field-of-view (FOV) to retrieve cloud liquid water path (LWP), total precipitable water, and wind speed. Resampling the TMI measurements to a common FOV is found to decrease retrieved LWP by 30%. These deconvolved brightness temperatures are …
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Machine Learning Methods and Computationally Efficient Techniques in Digital Rock Analysis
… at each step, primarily: (1) the resolution and Field of View (FOV), (2) bias and accuracy of identification and segmentation, and (3) the accuracy and computational intensity of direct simulation. These limitations are surpassed with machine learning and efficient simulation techniques. Super …
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Polarizing Optical Devices Based on Embedded One-Dimensional Subwavelength-Structured Photonic-Crystal Layers
… total internal reflection (TIR) and interference of light in a transparent thin-film coating at the base of a prism are presented. Explicit equations that guide the optimal design are provided. The optimal refractive index and normalized thickness of QWR coatings on glass and ZnS prisms are …
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Polymer-Based Microfluidic Devices for High Throughput Single Molecule Detection: Applications in Biological and Drug Discovery
The realization of high throughput sample processing has become a primary ambition in many research applications with an example being high throughput screening (HTS), which represents the first step in the drug discovery pipeline. Microfluidics is a viable platform for parallel processing of …
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