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 30 for “"subpixel"”.
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Subpixel Resolution Schemes for Multiphase Flows
… of the apparent particle image diameter and the subpixel position. The new methods significantly reduce the bias error due to pixel discretization, thus reducing the total error in the position and sizing measurement compared to the classic three point and least squares Gaussian estimators. In …
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Subpixel multiframe registration for formation flying spacecraft
This thesis develops a multiframe image registration algorithm to accurately estimate the motion parameters of a sequence of images with constant linear translation between frames. The algorithm is developed with formation flying applications in mind, where such motion is common. The algorithm is …
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Fast subpixel registration of 3-D images
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Subpixel motion estimation from sequences of video images
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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Novel Pixel-Level and Subpixel-Level Registration Algorithms for Multi-Modal Imagery Data
Image registration is an important pre-processing operation to be performed before many image exploitation and processing functions such as data fusion, and super-resolution frame. Given two image frames, obtained from the same sensor or from different sensors, the registration problem involves …
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GIS-based urban land use characterization and population modeling with subpixel information measured from remote sensing data
This dissertation provides deeper understanding on the application of Vegetation-Impervious Surface-Soil (V-I-S) model in the urban land use characterization and population modeling, focusing on New Orleans area. Previous research on the V-I-S model used in urban land use classification emphasized …
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Image understanding and feature extraction for applications in industry and mapping
… conjunction with area-based methods to 'obtain subpixel accuracy. A subpixel pattern recognition based method is also proposed and an investigation into improved area-based subpixel matching methods is undertaken. An algorithm for determining relative orientation parameters incorporating the …
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Advanced Computational Holography for Perceptual Enhancement and Application in HUDs
… the optimal system performance, we introduce a subpixel-level optimization method that accounts for practical issues such as fringing effects. The core advantage lies in simulating subpixel behaviour through a frequency-domain shift principle without altering the computational grid size, which …
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Detecting anomalies in remotely sensed hyperspectral signatures via wavelet transforms
An automated subpixel target detection system has been designed and tested for use with remotely sensed hyperspectral images. A database of hyperspectral signatures was created to test the system using a variety of Gaussian shaped targets. The signal-to-noise ratio of the targets varied from -95dB …
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Improvements in digital image correlation and application in material mechanical test
… guess for all points of interest with semi-subpixel level accuracy in cases with small or large translation, deformation, or rotation. The bisection searching strategy is presented to automatically adjust the frame step for varying practical circumstances.</p> <p>The improved DIC algorithm …
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Scanning-free compressive reconstruction of object motion with sub-pixel accuracy
… between reconstructions for consecutive subpixel movements, sub-pixel movement was successfully detected.
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A three dimensional vision system for industrial surface topography measurement
… and processed so that, in certain cases, subpixel resolution of the centre of the laser spot can be obtained. Expansion of the laser spot and varying the parameters of the optical system are examined to assess their effect over different target materials and estimates of the possible range …
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Computation & design for nanophotonics
… each of these issues in turn by developing novel subpixel smoothing methods that markedly improve the accuracy of simulations, demonstrate the failure of perfectly matched layers (PML) in several important cases and propose a workaround, develop a simple procedure to determine the validity of any …
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Development of Robust Correlation Algorithms for Image Velocimetry using Advanced Filtering
… Correlation (GTPC): designed to optimize the subpixel interpolation, and the Spectral Phase Correlation (SPC): estimates the image shift directly from the phase content of the correlation. While these estimators are designed for DPIV, the methodology described here provides a universal …
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Volcanology from space: applications of infrared remote sensing
… are used to constrain sizes and temperatures of subpixel resolution hot spots. Analysis of a 1989 TM scene of Lonquimay volcano suggests a cooling from 250 to 170°C of the crust of an active lava flow down 1.5 km of its length. Estimates of the summed radiative and convective heat losses from the …
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Quantifying Magnetic Moments And Susceptibilities Of Small Cylindrical And Spherical Objects In Mri
… able to determine the center of the object with subpixel precision. By rewriting those equations, the effective magnetic moment or susceptibility of the object becomes the only unknown to be solved. The uncertainty of quantified effective magnetic moment and susceptibility of the object is …
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Towards Interactive Landscape Visualization
… Das erhöht den Realismus, ohne Aliasing durch Subpixel- Strukturen einzuführen. Weiterhin zeigen wir wie physikalisch basiertes Shading die Wahrnehmung der Tiefenkomplexität verbessert. In einem letzten Schritt zeigen wir die Nachbearbeitung der erzeugten Bilder über Deferred Shading. Hier …
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