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 84 for “"Image resolution"”.
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Improvements in ultrasound image resolution
U of I Only Restriction set for Item 117773 on 2021-06-02T16:15:14Z with date by madinag@illinois.edu.
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Micro laser personal projector
… the effect of flickering while projecting an image. The use of a single lens to focus all lasers will save the complexity of collimating each laser independently. At the moment, the Micro Laser Personal Projector is displaying an image of 50 x 480 pixels. A DC brushless motor is used to steer …
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Influence of antenna pattern on synthetic aperture radar (SAR) imaging and complex permittivity extraction from images of multilayered media
… of a SAR imaging system, factors including image production time, image quality, and capability to get quantitative information from a produced SAR image are commonly investigated. Implementation of SAR imaging usually requires two steps, namely; image data collection, and post processing of …
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Fluid flow in porous media : NMR imaging and numerical simulation
… (NMR) imaging to obtain a three-dimensional image of the pore structure in a limestone core, 4.5 mm in diameter and 10 mm in length, with a resolution of 40 [mu]m. This image is converted into boundary conditions for simulation of fluid flow through the rock using the lattice gas method. The …
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The state of the art time-domain wavefield imaging using a discontinuous Galerkin forward-backward time-stepping method
… a robust noise performance, generating higher-resolution results than the two FD methods. The DGM-FBTS formulation is also modified for quantitative ultrasound imaging with preliminary results presented, as a foundation for future experimental work in this area. This ultrasound imaging …
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Reliable image reconstruction techniques : enforcing measurement consistency in deep learning methods
… (MRI) scan, where a detailed internal body image is constructed from radio and magnetic waves, to calculating Earth’s density from measurements of the gravitational field. Traditional methods to solve LIPs typically involve optimization algorithms, which have been rigorously studied for …
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Generalist 3D Cell Phenotyping for All-Type Tissues
… information, producing large amount of image data needs to be analyzed. Hundreds of heterogeneous cell types were detected through the data obtained across species and types of tissues. We developed a novel approach that is generally applicable to a wide range of cell types in the …
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Strawberry Detection Under Various Harvestation Stages
… Computational efficiency is defined in terms of image resolution as testing on a smaller dimensional image is much quicker than larger dimensions. The CNN based implementation obtained the best results with an 88% accuracy at the highest level of efficiency as well (600x800). LBP generated …
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Image Processing Considerations for High Resolution Diffusion Tensor Imaging of the Human Brainstem
… brainstem to other regions of the brain. High resolution DTI of the brainstem may be helpful in understanding diseases that implicate brainstem nuclei. There are technical challenges for DTI which must be addressed to provide the most sensitive and meaningful measurements. Some of these …
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The influence of micro-porosity on drainage relative permeability using digital core analysis
High resolution images acquired from X-ray micro-tomography provide 3D pore geometry on which flow and transport properties can be computed. However, these images exhibit limited resolution in particular if field of view needs to be optimised at the same time. Constrained by the image resolution, …
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PSF Sampling in Fluorescence Image Deconvolution
… imaging is largely affected by inherent resolution limitations because of out-of-focus light and diffraction effects. The traditional approach to restoring the image resolution is to use a deconvolution algorithm to “invert” the effect of convolving the volume with the point spread …
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Double resolution microwave holography
… the possibility of significant improvements in image resolution. Practical experiment has determined that, under ideal conditions, the resolution performance of this system approaches very closely the theoretical maximum. Design aspects of the Q-band microwave source/receiver have been …
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Understanding and predicting where people look in images
… the way people look at different types of images and provides methods of predicting where they look in new scenes. We describe a new way to model where people look from ground truth eye tracking data using techniques of machine learning that outperforms all existing models, and provide a …
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NPS TINYSCOPE program management
… spacecraft that can produce tactically relevant imagery data. Tactical requirements in this context would emphasize "good enough" image resolution with a rapid-response tasking loop and high revisit rate. The TINYSCOPE project intends to demonstrate the utility of small, risk tolerant spacecraft …
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Stochastic Space-Charge in Projection Electron Lithography and High Resolution Transmission Electron Microscopy
… a specific effect, the degradation in image resolution, as observed in two advanced technologies: SCattering with Angular Limitation Projection Electron Lithography (SCALPEL) and High-Resolution Transmission Electron Microscopy (HRTEM). These particular technologies were chosen for …
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Design Distributed Control and Learning Algorithms for a Team of UAVs for Optimal Field Coverage
… adjust their altitude to increase the image resolution of the border of the wildfire, while the whole team tries to maintain a complete view of it. In the second part, we utilized a model-free learning algorithm to solve a problem of optimal coverage for a static field of arbitrary …
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The development and demonstration of a practical methodology for fine particle shape characterisation in minerals processing
… the response of various shape descriptors to image resolution, and measurement with different devices and image processing routines. The most widely used shape descriptor in minerals processing, circularity, was found to be highly dependent on both image resolution and image processing …
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A machine learning based method for sensitivity estimation for accelerated magnetic resonance spectroscopy imaging using phased array coils
… a poor trade-off between imaging speed and image resolution has stunted development of MRSI applications. A combination of many technological advancements is necessary to bring MRSI to its full potential; one advancement is an accelerated imaging technique known as parallel imaging. Parallel …
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Development of the multi-scale dynamic modeling techniques for multi-modal brain recordings
… limit (~200 nm), we need an in-vivo super-resolution microscopy to achieve our goal. As a super-resolution imaging method, stimulated emission depletion (STED) microscopy has unraveled fine intracellular structures and provided insights into nanoscale organizations in cells. Although image …
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