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 55 for “"Decorrelation"”.
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Co -Channel Speech Separation Based on Adaptive Decorrelation Filtering
Finally, to further improve the separation performance achieved by the previous direct-form ADF as well as to facilitate modular and easy implementation of ADF in hardware, a lattice-ladder structure for ADF is developed based on the joint forward and backward linear predictions. Experimental …
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Decorrelation time of speckle targets observed with a heterodyne-reception optical radar
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1982.
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The Signal in the Noise: Understanding and Mitigating Decorrelation in Particle Image Velocimetry
Particle image velocimetry (PIV) has become one of the most important tools for experimentally investigating the physics of fluid flows. In PIV, image-processing algorithms estimate flow velocity by measuring the displacements of flow-tracer particles suspended in a fluid. The fundamental operation …
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The Decorrelation Length and Time Scale - Diagnostic Tools to Visualize Spatial and Temporal Variability in Geophysical Fields
… spatial variability. This thesis presents the Decorrelation Length Scale (DCLS and Decorrelation Time Scale (DCTS), novel techniques to characterize and visualize spatial and temporal variability in geophysical fields at a grid-point level, that is able to investigate this impact. The main …
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Effect of Vibration of Unconsolidated Sand on the Performance of Interferometric Vibration Sensors
… Doppler vibrometer output and cause speckle decorrelation in digital speckle pattern interferometry (referred to as digital shearography). An experimental investigation of the effect of varying the grain size and the vibration amplitude of sand is conducted. The experiments are two-fold: the …
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Recoverable resources calculation using non-linear methods: a comparative study
… limitations are accounted for by also requiring decorrelation to be used in instances where the data are considered in a multivariate sense. A novel method for decorrelation of geostatistical datasets, Independent Components Analysis (ICA), is compared against the more common method of …
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An Investigation of Differential Power Analysis Attacks on FPGA-based Encryption Systems
… exists between the amount of space required for decorrelation versus the amount of decorrelation that is desired, allowing a designer to determine the amount of correlation that can be removed for available space. Filtering of glitches on CLB output signals slightly reduced the amount of …
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Parameters affecting interferometric coherence and implications for long-term operational monitoring of mining-induced surface deformation
… nature of the area implied that signal decorrelation effects were expected. Consequently, four sources of data, captured at three wavelengths by earth-orbiting satellites were obtained. This provided the opportunity to investigate different phase decorrelation effects on data from …
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Hyperspectral Image Compression Using a Two-Stage KLT
… the standard JPEG 2000 technology. The component decorrelation of the JPEG 2000 (extension 2) is replaced with a two-stage Karhunen-Loeve Transformation (KLT) operation resulting in a reduction in the computational complexity. At the first stage the spectral data is partitioned into sets of …
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Fine-grained artworks classification
… of convolutional feature maps. With the decorrelation regularization, we further improve the classification accuracy of the proposed architecture.
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Synthetic aperture radar image simulator for interferometry
… a terrain classification map and temporal decorrelation factors. Output images include the following images: radar cross section, power, total coherence, temporal cohernece factor, geometrical coherence factor, absolute phase, interferograms and flattened interferograms.
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A portfolio of electroacoustic and live electronic compositions with research into stochastic synthesis
… convolution, spatialisation, as well as decorrelation from one to many channels, sample accurate looping and various sample accurate control systems, is also included in this thesis. Pieces: In a Cage Spinning Plates Poly |Kroðn| BlckWnd River Fields Immortal Lithium
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Random-vortex-particle methods applied to broadband fan interaction noise
… as Liepmann and von Karman spectra. The temporal decorrelation present in turbulent flows is modelled using Langevin Equations. A standard Langevin equation and a second-order Langevin model are derived in details and validated for fan interaction noise. In contrast with classical methods to …
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Optimised Mammogram Displays for Improved Breast Cancer Detection
… subtended by the fovea, was much lower. Thus, decorrelation by the visual system was ineffective and performance for the detection of a blob in the paired images was also ineffective. This thesis suggests that, whilst animated displays can be a powerful tool for the identification of …
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A wavelet-based numerical scheme for stochastic mechanics
… decorrelated wavelet coefficients. The amount of decorrelation obtained is an improvement over that achieved with orthonormal wavelet basis functions. It is shown that a biorthogonal dual wavelets with sufficient number of vanishing moments and corresponding to a low primal order perform better …
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Characterizing the perceptual diffusion of auditory lateralization images
… It was hoped that by varying the degree of decorrelation in these comparison stimuli, one could simulate different stages in the transition from two source images to one merged image observed in the target stimuli. The experiments failed to produce the expected results, but strategies for …
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Across-frequency processing in convolutive blind source separation
… using the criterion of Amplitude Modulation Decorrelation across different frequency channels. This enables separation of the sources' spectral components and their consistent order in all frequencies in a single processing step. It is shown that separation is close to the theoretical optimum …
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Nonlinear transform coding with lossless polar coordinates
… ability to achieve redundancy reduction beyond decorrelation without limitation to orthogonal linear transformations of the original variables. A high resolution analysis is given, and for source models inspired by a sensor network application and by image compression, simulations show …
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Cell-type specific cholinergic modulation of the cortex
… neurons as a dominant player in driving decorrelation and information processing through its intimate interactions with parvalbumin-expressing and pyramidal neurons. Chapter 3 highlights astrocytes and their interactions with pyramidal neurons as important drives for stimulus-specific …
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