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 742 for “"Wavelet"”.
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Wavelet analysis of temporal data
This thesis considers the application of wavelets to problems involving multiple series of temporal data. Wavelets have proven to be highly effective at extracting frequency information from data. Their multi-scale nature enables the efficient description of both transient and long-term signals. …
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Wavelet Factorization and Related Polynomials
… for efficient implementation of the discrete wavelet transform (DWT) for the algorithms of Daubechies and Sweldens and Mallat. Nearest neighbor lifting is a specific form of the general lifting scheme that improves the lifting algorithm by optimizing the number of efficient memory accesses. …
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Wavelet Transforms for Stereo Imaging
… especially when a new mathematical tool such as wavelet analysis becomes mature.<br/><br/>The aim of the thesis is to investigate the stereo matching approach using wavelet transform with a view to producing efficient and dense disparity map outputs. After the shift invariance property of various …
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WAVELET-BASED NETWORK TRAFFIC MODELING
… of network traffic have been discovered and wavelet-based models have been proposed to capture these characteristics. Before adopting wavelet models, their strengths and weaknesses have to be studied. The wavelet models require more parameters (2 + log2N parameters, where N is the number of …
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Image Compression by Wavelet Transform.
… <p>This thesis studies image compression with wavelet transforms. As a necessary background, the basic concepts of graphical image storage and currently used compression algorithms are discussed. The mathematical properties of several types of wavelets, including Haar, Daubechies, and …
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Wavelet analysis of geomagnetic jerks
… core (through a so-called geo-dynamo process). A wavelet tool was programmed in MATLAB and a wavelet analysis applied to detect and characterize singular events, or jerks, in the time series made of monthly mean values of the east component of the geomagnetic field from 45 selected worldwide …
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Wavelet transform analysis of seismic data
Not available
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Wavelet analysis of ULF magnetospheric waves
<p>Wavelet analysis is used to analyze magnetometer data and is compared to the traditional spectrogram technique, in particular, with respect to structured Pc 1--2 emissions. This results in the conclusion that the frequency modulation evident in Pearl pulsations is not continuous, but is …
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A wavelet model of seismic noise
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1955.
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Wavelet packet based transient signal classification
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.
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Wavelet Scattering Transforms Applied to Whale Vocalisations
… papers, we investigate the application of wavelet scattering transforms to whale vocalisations. We first consider how wavelet transforms can provide an alternative time-frequency decomposition for use in signal detectors. Detectors typically utilise the short-time Fourier transform (STFT), …
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Wavelet Thresholding for Non (Necessarily) Gaussian Noise
Soon after the discovery of orthonormal wavelets, in particular the <br>compactly supported ones, <br>these wavelets have been used for non-parametric function estimation. <br>In the literature, two main models are present. In the first model, <br>the target functions are members of some smoothness …
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Wavelet dönüşümüne dayalı dinamik güç spektrumu eldesi
… Bu çalışmada, Foster'ın Morlet dalgacıklarına (wavelet) dayanan ağırlıklandırılmış dalgacık z-dönüşümü (WWZ) algoritması için yeni bir Python programı geliştirilmiştir. Programın sonuçları, bazı X-ışın çift yıldızlarının RXTE/ASM verileri üzerinde test edilmiştir ve literatürdeki LS …
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Fast computation tools for adaptive wavelet schemes
… years, a new algorithmic paradigm for adaptive wavelet schemes was developed. First approaches covered elliptic problems, but meanwhile, the class of feasible problems could be significantly enlarged, including even certain nonlinear problems. This thesis will present and analyze routines for …
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Analysis of Wavelet Based Alternatives for OFDM
The objective of this thesis is to analyze wavelet based alternatives for orthogonal frequency division multiplexing (OFDM) and find whether a better system performance is achieved when compared to the discrete Fourier transform (DFT)-based OFDM. We analyze DFT, discrete wavelet transform (DWT), …
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Wavelet-Based Statistical Modeling and Image Estimation
… practice that a translation invariant (TI) wavelet transform enhances estimation performance. We analyze the conventional complete wavelet transform and the TI wavelet transform from the viewpoints of approximation and estimation theory. First, we show that the TI expansion produces smaller …
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