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 40 for “"sub-pixel"”.
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Scanning-free compressive reconstruction of object motion with sub-pixel accuracy
Sub-pixel movement detection is an under-sampling problem. The basic idea for successful detection is to spread out the information over a larger sampling region. Diffraction provides a natural way to spread out the information; however, conventional digital holographic methods are not effective …
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Sub-pixel Registration In Computational Imaging And Applications To Enhancement Of Maxillofacial Ct Data
… the form of bright regions, flares and erroneous pixels due to dental bridges, metal braces, etc. Currently, removing and cleaning up the data from acquisition backscattering imperfections and unwanted artifacts is performed manually, which is as good as the experience level of the technician. On …
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An Investigation Of Sub-Pixel Cloud/clear-Sky Contamination Using Hyper-Spectral AVIRIS Data
<p>Cloud and clear sky contamination due to sub-pixel clouds remains as a troubling issue for scientific applications that rely on remotely sensed data. Sub-pixel level clouds may not be detected by a standard cloud filtering process, and thus can cause uncertainties in satellite-based …
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Thermal-infrared radiosity and heat-diffusion model for estimating sub-pixel radiant temperatures over the course of a day
… assumption is that scene elements represented by pixels in fact have a single emissivity spectrum and are isothermal. Thus, estimated temperatures and emissivities are the effective values that would be found if these simplified assumptions were met. In reality, the physical scene is neither …
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Sub-Pixel Classification of Historical and Current Marsh Habitat For the Eastern Mississippi Gulf Coast Using Remotely Sensed Images
… of this project was to complete a historical sub-pixel prediction land use classification map for six land classes: water estuarine emergent wetlands, fresh water wetlands, forests, low intensity developed areas and high intensity developed areas using high spatial resolution imagery and …
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Monitoring vegetation dynamics in Zhongwei, an arid city of Northwest China
… processes (1990-2011) through a unified sub-pixel measure of vegetation cover. Research strategies included: (1) Conduct sub-pixel vegetation mapping (1990, 1996, 2004, and 2011) with Random Forest (RF) algorithm by integrating high (OrbView-3) and medium spatial resolution (Landsat TM) …
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Novel Pixel-Level and Subpixel-Level Registration Algorithms for Multi-Modal Imagery Data
… images acquired from dissimilar sensors) and sub-pixel image registration (i.e. registering two images at sub-pixel accuracy) are highly challenging and no satisfactory solutions exist.This dissertation introduces novel techniques to solve the image registration problem both at the pixel-level …
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Burst Imaging with Learned Continuous Kernels
… to local image information and take advantage of sub-pixel sample location information to demosaic, denoise and merge the burst into a high quality output.
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Computational photography with novel camera sensors
… image super-resolution with its non-conventional pixel design. It is shown that recording multiple images with a sensor of asymmetric sub-pixel layout increases the spatial sampling capability compared to a conventional sensor. Both proposed camera designs are the combination of novel imaging …
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High-Frame-Rate Oil Film Interferometry
… interferogram images in only a few minutes with sub-pixel error in fringe spacing. The skin friction was calculated using the oil film height history allowing for the direct measurement of skin friction in time dependent flows. </p>
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Monitoring Property Boundaries for the Appalachian National Scenic Trail Using Satellite Images
… encroachments can be detected. Detection of sub-pixel vegetation index decreases identifies specific locations for field inspection. Assuming low cost multispectral Landsat imagery is available, simple NDVI difference calculation allows this technique to be applied to the entire AT one or …
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An investigation into the design of a satellite based stereo imaging sensor and the use of automatic image matching in the production of digital elevation models
… of 535 mm. Furthermore, it was found that a sub-pixel accuracy matching requirement can be met and that a matching reliability of 89.6 can be achieved. Finally, it was found that the best matching results are obtained in areas of high image variance and low disparity variance.
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Resolution improvement in optical microscopy by use of multi-beam interferometric illumination
… by a single photodetector (e.g., a single pixel of a CCD), encodes the target's sub-pixel contrast pattern. Fourier domain components at spatial frequencies contained in the probing illumination patterns can be recovered from the pixel brightness sequence by solving a set of over-determined …
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Revealing and analyzing imperceptible deviations in images and videos
… However, both the baby and the roof can deviate subtly from their ideal models of perfect stillness and perfect straightness. These deviations can reveal important information like whether the baby is breathing normally or whether the house's roof is sagging. In this dissertation, we make the …
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Hybrid And Hierarchical Image Registration Techniques
… parameters could be first estimated. Subsequently, the robust gradient-based estimation algorithm is incorporated into the proposed hybrid approach using a multi-resolution scheme. Several novel and effective initial matching algorithms have been proposed for the first stage. The …
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Fuzzy Filters for depth map smoothing
… together with an established method of measuring sub-pixel disparities in stereo pairs of images. The noise in the disparity map associated with this matcher is investigated. The conjecture is made that a fuzzy inferencing system can be trained to perform a nonlinear filtering process which is …
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