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 17 of 17 for “"multiresolution analysis"”.
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Applications of smoothness-increasing accuracy-conserving filtering to particle-in-cell data denoising, enhanced multiresolution analysis, and entropy-correction schemes
… procedure can be viewed within the framework of multiresolution analysis (MRA), making it a natural candidate for application in mesh adaptive DG schemes, where it provides a means of providing more accurate approximations with reduced degrees of freedom as compared to uniformly refined data. To …
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Elimination of Edge Effects Using Spline Wavelets Which Maintain a Uniform Two-Scale Relation
… error near boundaries, called edge effects. For multiresolution analysis on a finite interval which employ the piecewise linear B-wavelet the present research provides a frontal approach to decomposition which avoids truncation of weight sequences, experiences no error at boundaries, and which …
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A wavelet-based technique for reducing noise in audio signals
… literature, as a new method of signal analysis. This marks a transition in wavelet study from theoretical investigation to application-driven research. In this paper, wavelets and wavelet transformations are presented in a context intended to be appropriate as a first exposure to the …
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The Nonexistence of Shearlet-Like Scaling Multifunctions that Satisfy Certain Minimally Desirable Properties and Characterizations of the Reproducing Properties of the Integer Lattice Translations of a Countable Collection of Square Integrable Functions
… function and those regarding dependencies on the multiresolution analysis defining properties—to the composite case. Two corollaries of these results are the nonexistence of composite scaling multifunctions of Haar-type, when the composite dilation group is infinite, and the nonexistence of …
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Stochastic Processes and Multi-Resolution Analysis: A Trigonometric Moment Problem Approach and an Analysis of the Expenditure Trends for Diabetic Patients
… processing questions) using tools in wavelet analysis, functional analysis (we use in particular the trigonometric moment problem), the theory of realization of rational functions, and reproducing kernel Hilbert spaces. A novel form of multiresolution analysis is formulated in the discrete …
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Quality control tools for interactive rendering of 3D triangle meshes
… build, evaluate and improve on the field of multiresolution analysis through decimation. We evaluate the quality of models generated through various simplification algorithms to develop efficient measures of image quality. We develop an application for selective, progressive and …
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Wavelet-Based Multiresolution Surface Approximation from Height Fields
… of representing three-dimensional surfaces, and multiresolution analysis (MRA) is often used to obtain compact representations of dense input data, as well as to allow surface approximations at varying spatial resolution. Multiresolution approaches, particularly those moving from coarse to fine …
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The discrete wavelet transform as a precursor to leaf area index estimation and species classification using airborne hyperspectral data
… has remained a critical challenge for effective analysis of hyperspectral data for vegetation applications. Discrete wavelet transform (DWT), through multiresolution analysis, offers oppurtunities both to reduce dimension and convey information at multiple spectral scales. In this study, we …
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Wavelet adaptive and predictive control with applications to chemical looping system
… state and output feedback control, based on multiresolution analysis, is proposed for a class of nonlinear uncertain dynamical system. The robust control technique has been introduced to attenuate the effects of external disturbances. To meet transient performance requirements, wavelet …
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Image Compression Using Balanced Multiwavelets
… The discrete wavelet transform (DWT) performs a multiresolution analysis of a signal; this enables an efficient representation of smooth and detailed signal regions. Furthermore, computationally efficient algorithms exist for computing the DWT. For these reasons, recent image compression …
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Feature extraction and knowledge discovery in process operation analysis
… signal by identifying the extrema from wavelet multiresolution analysis. The method is able to reduce the dimensionality of the data and removes noise components in a single step as well as capturing the most significant components of the dynamic response. A modified version of the unsupervised …
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Multiscale analysis of financial volatility
… to enjoy the advantages of both forms of analysis. The thesis is divided into three sections. First, after briefly outlining the Fourier methods, a more exible technique that allows for the study of time-scale dependent phenomena (motivated from a discussion on Heisenberg's uncertainty …
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Systemic Network-Level Approaches for Identifying Locations with High Potential for Wet and Hydroplaning Crashes
… with only crash counts by applying a spatial multiresolution analysis (SMA). Results indicate that SMA performs better than current hazardous-road segments identification (HRSI) methods based on crash counts by consistently identifying sites during several years for selected 0.1 km sections. A …
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Multisensor Multitemporal Fusion for Remote Sensing using Landsat and MODIS Data
… Earth observation. Landsat's role in scientific analysis has increased dramatically in recent years as a result of the open-access policy of the U.S. Geological Survey (USGS). However, this rich data record suffers from relatively low temporal resolution due to the 16-day revisit period of each …
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Robust Statistical Radio Interferometric Methods for the Detection of the Epoch of Reionization
… for whole multi-day datasets. Lastly, I use multiresolution analysis with wavelets to better characterize the 21cm signal, as it is non-stationary across redshifts due to the light-cone effect. I also show how the wavelet transform can be used for error detection by inspecting frequency-delay …
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3D multiresolution statistical approaches for accelerated medical image and volume segmentation
… medical volume which are multi-resolution analysis and statistical modeling. Multi-resolution analysis has been mainly employed in this research for extracting the features. Higher dimensions of discontinuity (line or curve singularity) have been extracted in medical images using a modified …
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Image Approximation using Triangulation
… images. With the help of the wavelet-based analysis, triangular meshes can be efficiently constructed to approximate the image data. In this thesis, this study will focus on local image enhancement and mesh simplification operations, which try to minimize the total error of the reconstructed …