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 20 for “"shape reconstruction"”.
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Shape Reconstruction with Topological Priors
… important role in solving the inverse problem of shape reconstruction. We classify the applications into 1D, 2D, and 3D cases:</p><p>In 1D, we show that the persistent extrema of the curvature function of a closed curve are useful for shape simplication. In 2D, we study how to label a scene into …
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Underwater shape reconstruction in two dimensions
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1994.
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Photometric stereo for micro-scale shape reconstruction
… proposes an approach for 3D micro-scale shape reconstruction using photometric stereo (PS) with surface normal integration (SNI). Based on the proposed approach, a portable cost-effective stationary system is developed to capture 3D shapes in the order of micrometer scale. The PS with SNI …
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Vision-based shape reconstruction and control of soft continuum arms
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-08-01
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Resilient Object Perception for Robotics
… a test-time adaptation method for both object shape reconstruction and pose estimation without the need for CAD models. Throughout the thesis, we demonstrate that by using a variety of tools from optimization and learning, we can develop resilient object perception systems that perform reliably …
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A GEOMETRIC VARIATIONAL APPROACH TO SHAPE INVERSION FOR RADAR
… this thesis, we develop a novel method for dense shape reconstruction of scenes using radar. For a given scene and antennas taking measurements from the scene, our method iteratively estimates the scene shape using the measurements. To this end, we use a deformable shape evolution approach which …
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From objects to worlds: scalable learning of 3D assets
… the development of robust 3D generation and reconstruction systems is hindered by the scarcity of high-quality 3D data. This thesis aims to address this scaling challenge along several dimensions. First, we introduce ShapeClipper, which leverages semantic consistency from unlabeled 2D images …
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Computational light transport using space, time, and polarization
… on seeing around corners; and (3) proof of shape reconstruction from polarimetric measurements. The thesis also contributes new applications that span: (a) micron-scale 3D cameras; (b) real-time object tracking around corners; and (c) single-shot computational relighting of images. Future …
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Captured open book image de-warping and shading correction using 3D depth information
… to correct the distortion due to the curved shape of the pages of an open book in captured images using of depth information. This work is relevant to camera-based capture devices that can use a projector to cast structured light patterns to provide depth information. In order to improve the …
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Asymptotic methods in applied waveguide problems
… in waveguides caused by targets of elaborate shape. The complexity of the resulting scattered field depends on the geometry of the scatterer, and exact solutions exist only for the simple geometries. The asymptotic methods developed in this dissertation give the approximate solutions for the …
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Local Shape Estimation Using Mechanochromic Structurally-Colored Tactile Sensors
… such as pressure, contact position, or contact shape. This thesis introduces a novel method for measuring and reconstructing the shape of an object based on a tactile imprint, and describes the framework for this method, the fabrication of the necessary materials, and the subsequent testing and …
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Registration of pre-operative lung cancer PET/CT scans with post-operative histopathology images
… on tissue-mimicking phantoms, to test different shape reconstruction methods. The choice of interpolator and slice thickness were found to affect the algorithm's output, in terms of overall volume and local feature recovery. In the second phase of the study, nine lung cancer patients referred for …
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Efficient sketch-based 3D character modelling.
… several research groups have developed 3D shape databases to retrieve 3D models from sketched inputs. Unfortunately, the current state of the art in sketch-based organic modelling (3D character modelling) contains a lot of gaps and limitations. To bridge the gaps and improve the current …
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Reconstruction from image correspondences
… contained in every single image. Visual reconstruction methods confront with the formidable, and still unanswered, challenge of delivering a comprehensive representation of structure, motion and appearance of a scene from visual information. Multi-view visual reconstruction deals with the …
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Modeling and algorithms for sensorimotor control of a soft continuum arm
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01
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Parametric curve and Partial Differential Equation-based parametric surface reconstruction from point clouds
… data. In the context of parametric curve reconstruction from point sets, two key objectives are to approximate the underlying structure of the point sets as accurately as possible while minimising the num- ber of curves used. Existing methods often struggle to balance these two factors …
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On Distributed and Acoustic Sensing for Situational Awareness
… to reconstruct a 2-D convex polygonal room shape.</p> <p>For spectrum sensing, we study the optimality of energy detection that has been widely used in the literature. This thesis studies the potential optimality (or sub-optimality) of the energy detector in spectrum sensing. With a single …
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Accumulator-based three dimensional building boundary reconstruction framework for satellite images
… (3D) building boundary detection and reconstruction from satellite images has various applications in computer vision such as 3D city modelling, radio network planning, urban planning, mapping, and navigation. Traditionally, 3D building models have been produced from multiview …
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Numerical Prediction of Drag Reduction and Interfacial Shapes Over Superhydrophobic Surfaces
… and its capability to predict equilibrium shapes over both structured and realistic rough surfaces is demonstrated. The solid boundaries are user-prescribed; to enable a Gibbs energy minimization for a real surface, a method was developed that allows implicit nonparametric shape …