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 127 for “"Wavelet-based"”.
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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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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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Target Detection Using a Wavelet-Based Fractal Scheme
… detection technique using a rotational invariant wavelet-based scheme is presented. The technique is evaluated on Synthetic Aperture Rader (SAR) imaging and compared with a previously developed fractal-based technique, namely the extended fractal (EF) model. Both techniques attempt to exploit the …
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A wavelet-based CMAC for enhanced multidimensional learning
… parameter. A more general CMAC is derived using wavelet-based receptive fields and a controllable decimation scheme, that is capable of convergence at any frequency within the Nyquist limits. The flexible decimation structure facilitates the optimization of computation for complex …
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A wavelet-based numerical scheme for stochastic mechanics
… techniques. This work studies a biorthogonal wavelet framework for the representation of random fields. It is shown that such a representation scheme leads to significantly decorrelated wavelet coefficients. The amount of decorrelation obtained is an improvement over that achieved with …
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Wavelet based design of digital multichannel communications systems
… scheme exploiting the mathematical theory of wavelets. Such a theory, developed recently, has had a great impact in many fields of engineering and of other scientific disciplines. In particular, wavelet theory has become very popular in the signal processing area; in fact it is a flexible …
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Hierarchical wavelet-based numerical models for digital data
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
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Wavelet based similarity measurement algorithm for seafloor morphology
… deal with these problems, we propose to use the Wavelet transform for similarity detection. Wavelets have been widely used during the last three decades in image processing. Since the Wavelet transform allows a multi-resolution decomposition, it is easier to identify the similarities between two …
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Wavelet-Based Multiresolution Surface Approximation from Height Fields
… This dissertation concerns the use of wavelet-based MRA methods to produce a triangular-mesh surface approximation from a single height field dataset. The goal of this study is to obtain a fast surface approximation for a set of height data, using a small number of approximating …
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Fast algorithms for wavelet-based analysis of hyperspectral signatures
… efficient manner. It has been proposed that wavelet-based methods may be superior to currently used methods for the analysis of hyperspectral signatures. In this thesis, a wavelet-based method, as well as traditional analytical methods, was implemented and applied to hyperspectral images. The …
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On Wavelet-Based Methods for Scalar-on-Function Regression
… done on three projects which extend and employ wavelet-based functional linear regression. In the first project, we propose a wavelet-based approach to functional mixture regression. In our approach, the functional predictor and the unknown component-specific coefficient functions are projected …
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Wavelet-based adaptive video coding for packet-switching networks
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Wavelet-based Image Compression Using Human Visual System Models
Recent research in transform-based image compression has focused on the wavelet transform due to its superior performance over other transforms. Performance is often measured solely in terms of peak signal-to-noise ratio (PSNR) and compression algorithms are optimized for this quantitative metric. …
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A hierarchical wavelet-based framework for pattern analysis and synthesis
… areas of statistical signal processing, current wavelet-based image models are inadequate for modeling patterns in images, due to the presence of unknown transformations inherent in most pattern observations. In this thesis we introduce a hierarchical wavelet-based framework for modeling patterns …
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A near-optimal wavelet-based estimation technique for video sequences
… and then performing a two-dimensional discrete wavelet transform on each of the resulting frames. Thresholding is then implemented, and the inverse transform is applied in order to recover an estimate of the original signal. It is shown that this scheme is e ective in improving signal-to-noise …
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Wavelet-based inversion of seismo-acoustic waves in arctic ice
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995.
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Wavelet-based multi-resolution techniques for two-dimensional data analysis
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.
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Wavelet-based multiresolution data representations for scalable distributed GIS services
… types of multiresolution data representations based on wavelet theories have been put forward. The designed Wavelet Image (WImg) data format helps us to achieve dynamic zooming and panning of compressed image maps in a prototype GIS viewer. The Wavelet Digital Elevation Model (WDEM) format is …
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