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 14 of 14 for “"Spatial filters"”.
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Spatial filter performance on point-target detection in various clutter conditions using visible images
… point targets in clutter is a challenge because spatial noise in an image can be much greater than temporal noise. Suppression of clutter uses a spatial filter matched to the target size. The goal of filtering is to reduce the spatial noise to the temporal noise limit. In this thesis, the …
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Distributed-effect modal domain optical fiber sensors for flexible structure control
… sensors can be fabricated with spatially varying sensitivity to the distributed measurand and act as spatial filters. The spatial variation in the sensor sensitivity, known as the sensor's weighting function, determines the measurement provided by the spatial filter. Spatial …
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Stabilization of POD-ROMs
… ROM (EF-ROM). Both Reg-ROMs use explicit POD spatial filtering to regularize (smooth) some of the terms in the standard G-ROM. I propose two different POD spatial filters: one based on the POD projection and a novel POD differential filter. These two new Reg-ROMs and the two spatial filters …
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Commutation Error in Reduced Order Modeling
We investigate the effect of spatial filtering on the recently proposed data-driven correction reduced order model (DDC-ROM). We compare two filters: the ROM projection, which was originally used to develop the DDC-ROM, and the ROM differential filter, which uses a Helmholtz operator to attenuate …
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Information theoretic design of breast sonography
… variability improves the performance of spatial filters. We also studied the limitation of these filtering methods as key assumptions are violated.
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Development of a new Infrared Pyramid Wavefront Sensor
… modulation and non-common path aberrations and spatial filters and their effects on the sensor have been analyzed in this way. The results were then directly applied in the design of PYRAMIR.
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Frequency selective surface-based sensing: Theory and applications
… been utilized for different applications such as spatial filters, reflectors, lenses, radomes, and more recently, as sensors. FSS-based sensors have shown potential for numerous applications in structural health monitoring such as crack detection, concurrent strain and temperature sensing, normal …
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Spatial dynamics modeling for data-poor species using examples of longline seabird bycatch and endangered white abalone
Spatial analysis of species for which there is limited quantity of data, termed as the data-poor species, has been challenging due to limited information, especially lack of spatially explicit information. However, these species are frequently of high ecological, conservation and management …
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Segmentation of textured images
… Mapping Approach (LSM) and the Multichannel Spatial Filtering Approach (MSF). In the LFS approach, a multiresolution scheme for extracting texture features is introduced. This scheme produces features which can describe texture characteristics at different resolution levels. The gradient …
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Using active contours for automated tracking of UV and EUV solar flare ribbons
… basics of image processing, such as applying spatial filters. We also look at the different approaches to image segmentation including a more in depth study of active contours. The role of image processing in solar physics and the driving forces for image processing development in solar …
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Probabilistic finite-difference time-domain simulations using stochastic electromagnetic macro-models
… design and manufacturing variations of disparate spatial scales, the method of sub-gridding is utilized, with the stochastic macro-model implemented in the sub-gridded region. To enable the insertion of the high spatial-resolution stochastic macro-model inside the FDTD grid, a class of isotropic …
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Synthesis Technique of Thickness-Customizable Multilayered Frequency Selective Surface for Plasma-Based Electromagnetic Structures
… implementation capability of high-order FSS filters using various dielectric spacers with arbitrary thicknesses. Such technique enables the realization of spatial filters with variable size, while maintaining the desired filter response. To highlight the significance of the proposed synthesis …
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Self-navigated prospective motion correction of repeated 3D-EPI acquisitions for functional MRI applications
… and better signal quality at higher spatial resolution. As such, 3D-EPI would be beneficial for fMRI if it could be made more motion robust. Various prospective and retrospective motion correction techniques have been developed to minimize subject motion or its effects during MR …