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 248 for “"Wavelet Transform"”.
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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 transform analysis of seismic data
Not available
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Adaptive magnetic resonance imaging by wavelet transform encoding
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1993.
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Identifying multiscale statistical models using the wavelet transform
Thesis (Elec. E.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1991.
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Image interpolation and denoising in discrete wavelet transform domain
… and processing time, manipulating images in the transform domain, which is possible, is an efficient solution; The uniform wavelet thresholding is one of the most widely used methods for image denoising in the Discrete Wavelet Transform (DWT) domain. This method, however, has the drawback of …
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Wavelet transform methods for identifying onset of SEMG activity
… (sEMG) activity. Applying methods from wavelet theory developed in the past decade to digitized signals, a robust algorithm has been designed for use with sEMG collected during reaching tasks executed with the less-affected arm of stroke patients. The method applied both Discretized …
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Analysis of protein secondary structure via the discrete wavelet transform
… prediction approach that uses the discrete wavelet transform. In order to use the wavelet technique, we convert the primary amino acid sequence of the protein to a numerical signal using the hydrophobic tendencies associated with the amino acids. The data used in this project consists of …
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Applications of Continuous Wavelet Transform in Hydraulic Fracturing and Reservoir Management
… explores the application of Continuous Wavelet Transform (CWT) in fracture diagnostics and reservoir management, offering an in-depth analysis of various methods and their effectiveness. It addresses key aspects of hydraulic fracturing diagnostics, including fracture closure …
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Wavelet transform-based multi-resolution techniques for tomographic reconstruction and detection
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1994.
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Basic spline wavelet transform and pitch detection of a speech signal
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Time-frequency analysis of Lamb waves using the Morlet wavelet transform
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2000.
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Multifractal analysis of heart rate variability using wavelet-transform modulus-maxima method
… In this study, the main objective is to use the wavelet-transform modulus-maxima method for the multifractal analysis of the heart rate time senes. The degree of the multifractality is defined by the singularities (a point in time series where a mathematical function is not differentiable). For …
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An FPGA-based Run-time Reconfigurable 2-D Discrete Wavelet Transform Core
… description of a two-dimensional discrete wavelet transform (DWT) core using the JBits run-time reconfigurable FPGA design tool suite. Several aspects of the design process are discussed, including implementation, simulation, debugging, and hardware interfacing to a reconfigurable computing …
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Optimal, Multiplierless Implementations of the Discrete Wavelet Transform for Image Compression Applications
The use of the discrete wavelet transform (DWT) for the JPEG2000 image compression standard has sparked interest in the design of fast, efficient hardware implementations of the perfect reconstruction filter bank used for computing the DWT. The accuracy and efficiency with which the filter …
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PROCESSING AND CLASSIFICATION OF PHYSIOLOGICAL SIGNALS USING WAVELET TRANSFORM AND MACHINE LEARNING ALGORITHMS
… waves i.e. P, QRS, and T, are described. A wavelet-based method is implemented to facilitate and enhance the detection process. The method not only provides high detection accuracy, but also efficient in regards to memory and execution time. In addition, the method is robust against noise …
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Trend Analysis of Belief-State History with Discrete Wavelet Transform for Improved Intention Discovery
… model and to analyze its trend with discrete wavelet transformation (DWT). Accordingly, a new algorithm is developed to improve the accuracy of intention discovery with trend analysis, and to reduce the dialog length by switching POMDP policies between contextual control modes according to the …
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Application of Wavelet Transform to Endurance Time Analysis Method for Performance-based Seismic Design
… motions in the frequency domain using Fourier Transform (FT) allows only the frequency content to be extracted. The temporal aspect of the dominant frequency and the range of frequencies that are considered the most important in affecting system response is lost.</p> <p>In this dissertation, …
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A comparison of discrete cosine transform and discrete wavelet transform algorithm in watermarking against common attacks
… documented done between Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT). In this report, the DCT watermarking algorithms and DWT watermarking algorithms were compared based on robustness and imperceptibility criteria. With DCT, the watermark bits were embedded into …
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