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 98 for “"structure from motion"”.
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Robotic 3D Reconstruction Utilising Structure from Motion
… the challenges of recovering 3D information from an environment using vision alone. There is a well-established literature on the principles of doing this, and some impressive demonstrations; but this thesis explores the practicality of doing vision-based 3D reconstruction using multiple, …
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Structure from Motion Using Optical Flow Probability Distributions
Several novel structure from motion algorithms are presented that are designed to more effectively manage the problem of noise. In many practical applications, structure from motion algorithms fail to work properly because of the noise in the optical flow values. Most structure from motion …
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LOW-COST PHOTOGRAMMETRY SYSTEM FOR GEOREFERENCED STRUCTURE FROM MOTION
… objects and terrain, which is referred to as the structure from motion (SFM) solution. The re-constructed model has three-dimensional colorized surfaces. Integration of geo-referenced data into SFM allows for precise geo-registration, scaling and orienting of the object. Today, industrial users of …
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Large scale structure from motion for autonomous underwater vehicle surveys
… and backscatter. Generating a composite view from multiple overlapping images is usually the most practical and flexible way around this limitation. In this thesis we look at the general constraints associated with imaging from underwater vehicles for scientific applications - low overlap, …
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Fast and Scalable Structure-from-Motion for High-precision Mobile Augmented Reality Systems
… and purely derived by comparing images from the user's mobile device to a 3D point cloud model generated from a set of pre-collected photographs. A further challenge of mobile augmented reality is creating 3D cyber-information and associating it with real-world physical objects, …
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A Continuous-Time Nonlinear Observer for Estimating Structure from Motion from Omnidirectional Optic Flow
… insect species utilize certain types of self-motion to perceive structure in their local environment, a process known as <italic>active vision</italic>. This dissertation presents the development of a continuous-time formulated observer for estimating structure from motion that emulates the …
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Estimating Floodplain Vegetative Roughness using Drone-Based Laser Scanning and Structure from Motion Photogrammetry
… high-resolution drone laser scanning (DLS) and structure from motion (SfM) photogrammetry-derived vegetation heights at the Virginia Tech StREAM Lab to determine Manning's roughness coefficient. We utilized two calibrated approaches and a calculated approach to estimate roughness from the two …
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Assessing the quantitative and qualitative differences between 3D point clouds produced from lidar and structure from motion
… clouds and digital elevation products derived from Unmanned Aerial System (UAS) acquired Structure from Motion (SfM) as compared to those obtained from lidar data. If the accuracy of UAS SfM proves to be on the same order as lidar, the technique could be used more often in lieu of or in …
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A comparative analysis of terrestrial laser scanning (TLS) and structure from motion (SfM) photogrammetry for measuring fluvial sediments
… over a broad range of scales, with Structure from Motion (SfM) techniques enabling production of precise DEMs based on point-clouds analogous to, and even denser than, those produced by LiDAR, at significantly reduced cost and convolution during post-processing. This study has …
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A structure from motion photogrammetric method for continuously measuring and tracking the deformations of soils during triaxial testing
… the air phase.</p> <p>This research presents a structure from motion photogrammetric method for continuously measuring the 3-D deformations of both saturated and unsaturated soils during triaxial testing. The proposed method has the following advantages: (a) it can continuously measure and track …
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3D Geologic Mapping and Characterization Using Digital Outcrop Models Generated from Uninhabited Aerial Vehicles and Structure-from-Motion Photogrammetry
… teaching, training, and research. Observations from outcrop exposures provide opportunities to directly characterize detailed sedimentological composition, architectural characteristics, and link observations across various scales. Conventional field mapping techniques have remained largely …
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Modeling Ozark Caves with Structure-from-Motion Photogrammetry: An Assessment of Stand-Alone Photogrammetry for 3-Dimensional Cave Survey
<p>Nearly all aspects of karst science and management begin with a map. Yet despite this fact, cave survey is largely conducted in the same archaic way that is has been for years - with a compass, tape measure, and a sketchpad. Traditional cave survey can establish accurate survey lines quickly. …
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Examination of the Potential of Structure-from-Motion Photogrammetry and Terrestrial Laser Scanning for Rapid Nondestructive Field Measurement of Grass Biomass
… Terrestrial Laser Scanning (TLS) and Structurefrom- Motion (SfM), in the development of rapid nondestructive AGB estimation of grassland plots. TLS and SfM volume metrics generated using a rasterized surface differencing method were linearly related to destructively measured total AGB …
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Development of a high temporal resolution rockfall database using structure-from-motion photogrammetry and analyses of seasonal- and weather-rockfall relationships
… that consistently impacts human lives and infrastructure. Understanding the relationship between rockfall and weather and seasonal patterns in rockfall activity can aid in developing hazard management and mitigation plans. Numerous studies have been performed to investigate these trends in a …
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Investigating rates and mechanisms of lateral erosion in a small bedrock river using erosion pins, structure-from-motion photogrammetry, and optically stimulated luminescence dating: Konza Prairie, northeast Kansas
… of lateral bedrock erosion. Erosion pins and structure from motion (SfM) were used to determine annual lateral erosion rates and spatio-temporal patterns of erosion along bedrock channel banks. Single-grain optically stimulated luminescence (OSL) dating of fluvial deposits overlying a strath …
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Rockslope and landslide monitoring using high temporal resolution terrestrial structure from motion photogrammetry: a case study of a landslide in Majes zone, Peru using multi-epoch photogrammetric techniques
… injury of persons or damage to property or infrastructure. There has been extensive research into the processes that drive slope movements, but most have been based on monitoring data that is either limited in temporal resolution or limited in spatial resolution. Point clouds created from lidar …
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Enhanced image-based 3D reconstruction with 2D-to-3D constraints
… discusses an improvement to the Mesh-Assisted Structure from Motion algorithm. Mesh-Assisted Structure from Motion is an improvement over the original Structure from Motion algorithm, which generates a 3D reconstruction of a scene based on a set of 2D images depicting the scene. Mesh-Assisted …
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