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 73 for “"3D geometry"”.
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From Discrete to Continuous: Learning 3D Geometry from Unstructured Points by Random Continuous Space Queries
… methods and building well-behaved point-cloud 3D shape features to achieve more robust, invariant, and versatile implicit neural representations (INR) of 3D shapes. In recent efforts to explore point-cloud based learning methods to improve 3D shape analysis, there has been much attention paid …
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Neural Feature Fields for Language-Guided Robot Manipulation
… however, require a detailed understanding of 3D geometry, which is often lacking in 2D image features. This work bridges this 2D-to-3D gap for robotic manipulation by leveraging distilled feature fields to combine accurate 3D geometry with rich semantics from 2D foundation models. We present a …
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Exploring neural responses in the human brain to real-world face size and distance
In natural binocular vision, three-dimensional (3D) geometry provides information about physical facial size and egocentric distance that can inform social behaviours. Yet most neuroimaging studies present two-dimensional stimuli at fixed distances and overlook 3D spatial cues. In this fMRI study, …
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Computational Modeling of Total Temperature Probes
… were completed using 2D axisymmetric and 3D geometry of stagnation total temperature probes using ANSYS Fluent. The geometric effects explored include comparisons of shielded and unshielded probes, the effect of leading edge curvature on near-field flow, and the influence of freestream …
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Numerical Analysis of Multiphase Flow in Bubble Columns and Applications for Microbial Fuel Cells
… al. were then applied to a three-dimensional (3D) geometry. It was demonstrated that the increase in accuracy from 2D to 3D is negligible compared to the increase in CPU required to simulate the entire 3D domain. Additionally, the reaction chamber of a microbial fuel cell (MFC) was modeled and …
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Online Acquisition of Simulatable Rigid Object Models
… We explore two methods for reconstructing the 3D geometry of objects and test their performance in simulation and in real-world experiments. Our results demonstrate that a learned depth model enables 3D reconstruction of unknown objects and their successful integration into simulation …
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On Disentangled Analysis-by-Synthesis Shape Representations
… requires forming internal representations of its 3D geometry, often through visual perception. Hence, in this thesis, we investigate the representation learning of 3D shape via computer vision (CV). In particular, we explore the Analysis-by-Synthesis (AbS) paradigm, which postulates perceptual …
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A Computational Fluid Dynamics Study on the Aerodynamic Performance of Ram-Air Parachutes
… challenges in the prediction of the inflight geometry, as there is a strong interaction between the flow field and parachute structure. This thesis presents the development of a CAD design and CFD methodology to the simulation of ram-air parachutes in steady-state conditions. Starting from a …
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A Computational Model of Aneurysmal Flow at the Abdominal Aorta
… element Windkessel model was coupled to the 3D geometry model of the disease in order to couple inlet flow with outlet pressure. This model resulted in more precise hemodynamic conditions for pulsatile flow: 1- in terms of realistic wall pressure values and pressure curves, 2- realistic …
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DESIGN AND ANALYSIS OF THE ROTOR OF A FULLY SUPERCONDUCTING MACHINE
… The model developed includes a realistic 3D geometry representation and is based on parametric design methods. COMSOL MultiPhysics has been used to validate the mechanical calculations including the thermal stress, strain, displacement and torque induced stress and deformation. This …
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Acquisition and modeling of material appearance
… scenes requires a precise description of surface geometry, lighting, and material appearance. While 3D geometry scanning and modeling have advanced significantly in recent years, measurement and modeling of accurate material appearance have remained critical challenges. Analytical models are the …
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Volumetric Attribute Compression for 3D Point Clouds using Feedforward Network with Geometric Attention
We study 3D point cloud attribute compression using a volumetric approach: given a target volumetric attribute function $f : \mathbb{R}^3 \rightarrow \mathbb{R}$, we quantize and encode parameter vector $\theta$ that characterizes $f$ at the encoder, for reconstruction $f_{\hat{\theta}}(\x)$ at …
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Motion sculptures : automating artistic visualization of shape and time
… visualizing complex human and object motion via 3D motion sculptures -- a representation that conveys the 3D structure swept by the human's body as it moves through space. Given only a monocular RGB video as input, our algorithm computes the motion sculpture by estimating the object's 3D geometry …
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Efficient data structures for distributed and mobile geometry processing
3D geometry data is now establishing as a new digital multimedia data type after text and sound in 1980' and images and video in 1990'. One of the major advantages of 3D data is that it enables users to actually interact with the displayed contents, which has embraced more and enhanced interactive …
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Probabilistic Methods for Monocular 3D Human Reconstruction
Remarkably, humans can infer the approximate 3D surface geometry and appearance of complex articulated objects, such as people and animals, given but a single 2D RGB image. In fact, we can reason about the whole range of 3D poses and body shapes, surface colours and textures that can plausibly …
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3D face modeling with a consumer depth camera
Modeling the 3D geometry of the face is an important research topic in computer graphics and computer vision. The applications for face models include computer animation and facial analysis. Over the past few decades, several face modeling techniques have been developed using both active and …
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Real-time dense simultaneous localization and mapping using monocular cameras
… SLAM solution capable of reconstructing dense 3D geometry online without the aid of a graphics processing unit (GPU). The key contribution is a multi-resolution depth estimation and spatial smoothing process that exploits the correlation between low-texture image regions and simple planar …
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Origami nanofabrication of three-dimensional electrochemical energy storage devices
The Nanostructured (TM) 3D Fabrication and Assembly Process was developed as a novel method of creating three-dimensional (3D) nanostructured devices using two- dimensional micro- and nanopatterning tools and techniques. The origami method of fabrication is a two-part process in which …
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Integration of photonic and passive microfluidic devices into lab-on-chip with femtosecond laser materials processing
… method for the integration of high resolution, 3D structures into Lab-On-Chip (LOC) systems. One major application of femtosecond laser materials processing is waveguide fabrication in glass via index modification. We demonstrate the ability to fabricate couplers and Mach-Zehnder Interferometers …
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Materials and designs for 3D conformal electronics with capabilities in cardiac mapping and stimulation
… both basic and clinical cardiology. The complex 3D geometry and time-dynamic deformations of the heart, however, create difficulties in establishing intimate, non-constraining interfaces between medical electronics and cardiac structures. Here we present advanced materials, mechanical designs and …
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