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.
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Showing 1 to 20 of 36 for “"Scale-space"”.
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Macro-scale space systems for geoengineering
… resources of Earth. This thesis sets out several space-based scenarios that can be implemented to reduce these pressures, namely space-based geoengineering to offset the effect of a warming climate and the use of orbiting reflectors to reduce the challenges of human exploration of the Moon. …
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Nonlinear scale space analysis in image processing
… to overcome certain shortcomings of Gaussian scale spaces [72]. These existing techniques are reviewed in a background chapter. SIDEs are then described and experimentally shown to suppress noise while sharpening edges present in the input image. Their application to the detection of abrupt …
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Materials for small-scale space propulsion systems
… (iEPS), a compact, efficient, and scalable space propulsion system for use in a wide range of space missions. The increasing utilization of small, cheap, easy-to-launch satellites known as CubeSats has spurred demand for a propulsion system which exists at the nexus of high power efficiency, …
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Contour Extraction of Drosophila Embryos Using Active Contours in Scale Space
… on the connected components in the gaussian scale space of an embryonic image. The active contour model is applied on the images to refine embryo contours. Data cleaning methods are applied to smooth the jaggy contours caused by blurred embryo boundaries. The scale space theory is applied to …
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An Automatic Framework for Embryonic Localization Using Edges in a Scale Space
… of connected components of edge pixels in a scale space. We propose criteria to select optimal scales for embryonic localization. Furthermore, we propose a scale mapping strategy to compress the range of a scale space in order to improve the efficiency of the localization framework. The …
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Technoeconomic Assessment of a Gossamer, Planar, Gigawatt-Scale Space-Based Solar Power System
This thesis aims to analyze space-based solar power (SBSP) from both technical and financial standpoints. While the analysis is mainly purposed to validate the findings of existing literature on SBSP, it also seeks to identify the problems that need to be addressed for SBSP to become technically …
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Multi-scale and multi-spectral shape analysis: from 2d to 3d
… is demanded for the researchers to construct the scale space directly on the 3D shape.</p> <p>To address these research issues, in this dissertation, in order to find the multiscale processing for the 3D shape, we start with shape vector image diffusion framework using the geometric mapping. …
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Dynamic impact induced by tornadoes through simulations based on two-way wind-structure interactions
… civil structures. First, wind effects on large-scale space structures induced by straight-line winds are investigated to fully understand the current building code against wind loads. Then, a real-world tornado is numerically simulated and verified based on full-scale radar-measured data. Based …
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Fast Waveform Pattern Matching With Significant-Point Frames
The basic technique of scale-space filtering has been modified to render it suitable for detecting instances of short-duration "patterns" in one-dimensional waveform data. Scale-space filtering involves convolving a signal with a parametric kernel, such as the Gaussian function. The contour plot …
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Robust and flexible multi-scale medial axis computation
The principle of the multi-scale medial axis (MMA) is important in that any object is detected at a blurring scale proportional to the size of the object. Thus it provides a sound balance between noise removal and preserving detail. The robustness of the MMA has been reflected in many existing …
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Morphometric Otolith Analysis
… standardised encoding method (MPEG7 - Curvature-Scale-Space) and with a recent addition to shape modelling techniques (time-series shapelets) to determine which performs best. An investigation is carried out into transform methods that retain size-information, and whether the boundary encoding …
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Building a model of "spatial ability" : an analysis of grade 5 and 6 learners' strategies for solving "spatial" activities
… Certain questions related to interaction in space arising from the literature review are noted in this model. Three aspects of this interaction are the focus of the empirical study. The results of the research are used to shed light on the preliminary model of "spatial ability". The three …
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Spatial Mapping in Wild White -Faced Capuchin Monkeys (Cebus Capucinus)
… exploit home ranges that vary on spatial scales ranging from less than one hectare to several hundred hectares. However, little is known concerning how nonhuman primates internally store spatial information. Two primary forms of spatial memory have been hypothesized for primates. First, it …
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A preliminary formalization of scale in topology optimization
… enforces a minimum feature size, also known as a scale, to avoid instability and inaccuracy in the optimized result. This is usually done by applying a discretized convolution kernel on either the density or the sensitivity values. It is not well-established, however, exactly how this filtering …
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A parking assistant system
… are extracted in each image using a Curvature Scale Space (CSS) based corner detector. Corresponding feature points are then matched between consecutive frames and tracked through the entire sequence. Using the motion parameters of the vehicle obtained from measuring the angular moment of the …
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Cognitively-inspired direction giving
… and organize their knowledge of large-scale space, to create a system that generates written route overviews. Route overviews provide a big picture description of a route, and are intended to supplement the information in turn-by-turn directions. Our route overviews are based on …
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Computational Analysis and Design of the Electrothermal Energetic Plasma Source Concept
… sources can be used in everything from small scale space propulsion thrusters to large scale material deposition systems for use in a manufacturing setting. The sheer number of different types of ET sources means that there is always additional scientific research and characterization studies …
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Adaptive and autonomous protocol for spectrum identification and coordination in ad hoc cognitive radio network
… an algorithm comprising of the Wavelet-based Scale Space Filtering (WSSF) algorithm and the Otsu's multi-threshold algorithm to form an Adaptive and Autonomous WaveletBased Scale Space Filter (AWSSF) for Primary User (PU) sensing in CR. These combined algorithms produced an enhanced algorithm …
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Anisotropic variational models and PDEs for inverse imaging problems
… operator splitting techniques. We study their scale-space properties and show their efficiency in processing large images. Moreover, we generalise the osmosis equation to accommodate suitable directional information: this modification turns out to be useful to correct for the well-known …
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Theoretical and experimental investigation of Hall thruster miniaturization
Interest in small-scale space propulsion continues to grow with the increasing number of small satellite missions, particularly in the area of formation flight. Miniaturized Hall thrusters have been identified as a candidate for lightweight, high specific impulse propulsion systems that can extend …
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