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 201 for “"raster"”.
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Vectorization of Raster Images Using B-Spline Surfaces
A system has been developed for converting raster images into vector images. Raster images are made of pixels, while vector images are made of smoother shapes. The image is first segmented, and the segments are layered. The boundary of each segment is approximated with a periodic B-Spline curve. …
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Web-based management of time-series raster data
… to organizations that manage huge archives of raster datasets such as those generated by satellite remote sensing. Satellite remote sensing produces a regular stream of raster datasets used in many applications including environmental and agricultural monitoring. This thesis presents a system …
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A study of four raster-based data generalization procedures
Strategies for generalizing raster-based land cover data were investigated. Generalization strategies were studied as part of the U.S. Geological Survey's (USGS) Federal Land Information System (FLIS). Area filtering, category aggregation, resampling, and modal search and replace comprised the …
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Unitary suprathreshold color-difference metrics of legibility for CRT raster imagery
… color contrast and legibility for digital raster video imagery. CIE colorimetric components were combined into three-dimensional color coordinate systems whose coordinates map one-to-one with the physical energy parameters of all colors. The distance between any two colors' coordinates in …
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Surface modification of ceramic and metallic alloy substrates by laser raster-scanning
… the feasibility of continuous wave laser-raster scanprocessing under controlled atmospheric conditions as employed in three distinct surface modification processes: (a) surface roughness reduction of indirect-Selective Laser Sintered 420 martensitic stainless steel–40 wt. % bronze …
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A color spatial display based on a Raster framebuffer and varifocal mirror
… monitor is driven with signals from a 24-bit raster graphics framebuffer. In total, this is a remarkably inexpensive spatial display, and the first of its kind to incorporate multicolor imagery. This paper surveys much of the work in 30 that has led to the techniques employed in the project …
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Raum-zeitliche Abbildungen von Stromfilamenten in p-Germanium mit Hilfe eines Tieftemperatur-Raster-Laser-Mikroskops
… können, wurde ein selbstgebautes Tieftemperatur-Raster-Laser-Mikroskop aufgebaut. Anhand der Ergebnisse läßt sich das dynamische Verhalten des Halbleiters anhand von Strom-Spannungs-Kennlinien, zeitlicher (spontane Oszillationen des Probenwiderstandes) als auch räumlicher(räumlich inhomogene …
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Estimating toner usage with laser electrophotographic printers, and object map generation from raster input image
… of the predictions.^ In Part 2, we describe a raster-input-based object map generation algorithm (OMGA) for laser, electrophotographic (EP) printers. The object map is utilized in the object-oriented halftoning approach, where different halftone screens and color maps are applied to different …
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The effects of raster structure suppression on visual thresholds, target acquisition performance, and image quality
… by a series of parallel luminous lines called a raster. The visual prominence of the raster structure interferes with the extraction of information from the image. The raster may be suppressed experimentally by a deflection process called spot wobble. Experiments were conducted to determine the …
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Development of a system to digitally store, display, and allow manipulation of a raster scan video frame
Thesis. 1977. B.S.--Massachusetts Institute of Technology. Dept. of Interdisciplinary Science.
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The effects of luminance contrast, raster modulation, and ambient illumination on text readability and subjective image quality
… examined the effects of luminance contrast, raster modulation, and ambient illumination on readability and image quality of text presented on a CRT display. Participants read a Tinker Speed of Reading text passage on the monitor and then responded when they found the out-of-context word in …
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Using Accumulation Based Network Identification Methods to Identify Hill Slope Scale Drainage Networks in a Raster GIS
… network identification method (ANIM) in a raster Geographic Information System (GIS) posed by O'Callaghan and Mark (1984) has been criticized for producing a spatially uniform drainage density (Tarboton 2002) at the watershed scale. This criticism casts doubt on the use of ANIMs for …
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Design of a slurry layer forming station and improved fluid handling system for raster processes in 3DP®
… spreading dry powder and prints binder using a rastering scheme with a continuous-jet printhead. For smaller parts and greater accuracy, a variation on the process called slurry 3DPTM (s3DPTM) uses raster-built slurry layers and a vector-printing scheme with a drop on demand (DoD) printhead. …
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Evaluating the accuracy of line thinning algorithms after processing scanned line data
… layer removal process are evaluated. Seven raster images are thinned using these methods. The raster results are compared based on the number of pixels deleted and on the number of retained pixels that fall either on or off the medial axis of the original matrix. The four algorithms that …
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Cartographic visualization of Saskatchewan’s population using dasymetric mapping.
… of regression analysis. Different file formats (raster and vector) were considered when producing the dasymetric maps. It was observed that, due to the regular sizes of raster cells, dasymetric maps using raster data are generally more accurate than dasymetric maps using vector data. In the …
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A One Pass Line-Following Algorithm for Linear Feature Extraction
… paper presents a new algorithm for converting raster-scanned maps to vector format. By exploiting local geometric symmetries of multi-pixel-width line features in raster format, the algorithm follows the center of a line feature by maintaining an equal distance to the exterior of the feature in …
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The design and evaluation of a Java image analysis tool for componentizing lines from digitial architectural floor plans
… format conversion by vectorizing the lines in a raster image of an architectural floor plan. The tool aimed to apply a method that was previously used in another field (mechanical engineering) to Architectural floor plans. The method used had to overcome the problems associated with raster …
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