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 “"sharpening"”.
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Data-driven Automatic Edge Sharpening
Sharpening is a powerful image transformation because sharp edges can bring out image details. Sharpness is achieved by increasing local contrast and reducing edge widths. We present a method that enhances sharpness of images and thereby their perceptual quality. Most existing enhancement …
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Nanowire sharpening : application to field ionization
… and discuss their consequences. As we will see, sharpening a cylindrical-post nanowire of height H = 1um, starting radius of curvature r₀ = 100nm, and base size b = 2 · r₀ = 200nm can enhance the field further by an order of 100. In addition, the dielectrophoretic (DEP) force present due to …
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Effect of Image Sharpening on Radiographic Image Quality
… using the most common type of filter; sharpening. Four imaging modalities (2 CMOS, 1 PSP, 1 conventional film) were used to radiograph a DDQA imaging phantom (Digital Dental Quality Assurance phantom) and to create a flat field radiograph. Contrast resolution, spatial resolution, …
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Sharpening the Boundaries of the Sequential Probability Ratio Test
<p>In this thesis, we present an introduction to Wald’s Sequential Probability Ratio Test (SPRT) for binary outcomes. Previous researchers have investigated ways to modify the stopping boundaries that reduce the expected sample size for the test. In this research, we investigate ways to further …
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Pulse Sharpening Effects of Thin Film Ferroelectric Transmission Lines
<p>Advances in material science have resulted in the development of electrically nonlinear high dielectric thin film ferroelectrics, which have led to new opportunities for the creation of novel devices. This dissertation investigated one such device: a low voltage nonlinear transmission line …
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Automated image sharpening via supervised learning with human preferences
We propose an automatic method for image sharpening that maximizes the perceptual sharpness while preserving naturalness and original colors of a given image. We hypothesize a set of image properties to model the context for selection of sharpening parameters. We hypothesize and then verify that …
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Parallel Plasma Field Directed Sputter Sharpening of Field Emitters
… in conjunction with field directed sputter sharpening methodology. With field directed sputter sharpening, a positive voltage bias is applied to the field emitter and impinging ions are repelled away from the apex of the tip to the shank of the tip. This produces a very sharp tip with radius …
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Scanning tunneling microscopy studies of fluorinated graphene films and field-directed sputter sharpening
… we develop the novel field-directed sputter sharpening (FDSS) technique for producing sharp metal probes with 1 – 5 nm radii of curvature, a prerequisite for high-resolution scanning tunneling microscopy (STM) imaging and nanolithography. We show that FDSS offers significant improvements in …
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Preferred levels of image sharpness and their relation to image structure in thermal dye transfer prints
… scales found that higher levels of image sharpening (filter levels 1.5x to 2.5x) were generally preferred. However, for some conditions, particularly the portrait, lower levels of sharpening were generally preferred. While it appears that the preferred level of image sharpness may be …
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Edge-Preserving Image Upsampling and Image Warping
… roundup filter, with the former excels at edge sharpening and the latter finds a better balance between edge sharpening and fine-detail preservation. Moreover, we propose a pixel migration idea that relocates pixels in the image plane. We implemented pixel migration using a mass-spring physics …
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Multimedia mathematics intervention for math-delayed middle school students
The purpose of this study is to determine if the Sharpening Math Skills Lab technology-mediated mathematics instructional practices for math-delayed middle school students have positive effects on their mathematics achievement and spatial visualization ability and to gauge student engagement in …
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Two photon parametric conversion of Moessbauer gamma rays
… cross section. We then discuss the signal sharpening which occurs for coherent parametric conversion near a Bragg angle and, finally, make a specific calculation of the expected counting rate from a crystal of Ytterbium 171.
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A multimodal program of identification and remediation for intermediate students with learning disabilities in the area of written expression
… those who have established a delaying routine of sharpening pencils, losing materials, or making trip to the wastebasket; (6) those who work while the teacher is beside them and stop working when the teacher goes away form them.</p>
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Assessing Satellite Image Data Fusion with Information Theory Metrics
… of certain data fusion algorithms (pan-sharpening, principal component analysis (“PCA”) based, and high-pass filter (“HPF”) based) but not others.</p>
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Formation of uniform particles: Morphology and colloidal stability, and stable particle growth during precipitation from titanium alkoxides
… suspension throughout the reaction and a self sharpening growth mechanism to provide narrow size distribution. Factors that control particle morphology in the absence and presence of shear and the mechanisms of growth of colloidally stable suspensions are discussed. Two factors are identified …
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A feedback analysis of outer hair cell dynamics
… lead to a membrane time constant speedup and a sharpening of the mechanical response.
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Constraint-Based Interpolation
… smoothing model that smooths "jaggies" and a sharpening model that alleviates blurring. This thesis describes the three models, their methods and constraints. The effects of the various models and constraints are also shown, as well as a human observer test. A variation of a previous …
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Aristotle on Practical Reasoning: Perception, Reason and Action in Aristotle’s Thought
… and how philosophy is indispensable in not only sharpening practical reason but also transcending its limitations.</p>
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