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 105 for “"Gabor"”.
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Gabor frames with trigonometric spline dual windows
A Gabor system is a collection of modulated and translated copies of a window function. If we have a signal in $L^2(\mathbb{R})$, it can be analyzed with a Gabor system generated by a certain window $g$ and then synthesized with a Gabor system generated by another window $h$. If this leads us to a …
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Color Face Recognition using Quaternionic Gabor Filters
… extracted from application of a family of Gabor filters can be extended to use with color. A particular method of defining a filter appropriate for color images is used; the usual complex Gabor filter is adapted to the domain of quaternions.. Four alternative approaches to the extension of …
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Image Classification using Gabor Filters and Machine Learning
… we propose a classification methodology based on Gabor feature space representation of aerial imagery, where the two object classes may be well separated. We evaluate two different distance metrics to discern class separation and use the receiver operating characteristic curve to determine an …
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Entropy aided RF-DNA fingerprint learning from Gabor-based images
The number of devices connected to the internet have been increasing and shape Internet of Things (IoT). The security of IoT is an issue due to the use of weak or no encryption. Specific Emitter Identification (SEI) was introduced to overcome this issue by introduce RF-DNA fingerprinting exploring …
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Robust Unconstrained Face Detection and Lip Localization Using Gabor Filters
… Following face detection, a lip-specific Gabor filter-based feature space is utilized to extract facial features and localize lips within the frame. Results indicate a 75% lip localization overall success rate despite the demands of the visually noisy environment.
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On the performance of convolutional neural networks initialized with Gabor filters.
… convolutional layer closely resembles the Gabor filters. Gabor filters have existed for a long time, and researchers have been using them for texture analysis. Given the nature and purpose of the receptive layer of CNN, Gabor filters could act as a suitable replacement strategy for the …
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Robust speech recognition based on spectro-temporal processing
… Menschen hin. Daher werden Sigma-pi Zellen und Gabor Filter als Methoden zur Extraktion sekundärer Merkmale auf Basis einer spektro-temporalen Repräsentation evaluiert. Insbesondere die Gabor Merkmale beinhalten das Cepstrum sowie eine rein zeitliche Filterung als Spezialfälle, wobei darüber …
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Feature extraction in image processing and deep learning
… on deriving proper representations of data using Gabor transform in this thesis. A novel neural network with proven approximation properties dependent on its size is developed using Gabor system. In quantum energy regression, invariant representation of chemical molecules using electron densities …
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Investigation of new feature descriptors for image search and classification
… image search and classification. Based on the Gabor wavelet transformation, whose kernels are similar to the 2D receptive field profiles of the mammalian cortical simple cells, a series of new image descriptors is developed. Specifically, first, a new color Gabor-HOG (GHOG) descriptor is …
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Robust speech recognition based on spectro-temporal processing
… speech perception. Therefore, sigma-pi cells and Gabor filter functions are investigated as secondary feature extraction methods based on spectro-temporal representation. Especially the Gabor features are versatile enough to include cepstral features and purely temporal filtering as special cases, …
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The Hologram and its Antecedents 1891–1965: The Illusory History of a Three–Dimensional Illusion
… the three-dimensional hologram. However, Dennis Gabor (1900-1979) in his original publications on the hologram of 1948 and 1949 did not cite Lippmann’s work. This thesis explores how the hologram that featured in Gabor’s original theory, as an imaging technique to improve the electron-microscope, …
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Constant Amplitude Zero Autocorrelation Sequences and Single Pixel Camera Imaging
… to CAZAC sequences. We then apply them to Gabor frames and prove a condition for checking when Gabor systems generated by a CAZAC sequence are tight frames. We also construct multiple examples using this condition. Finally, we explore natural generalizations of CAZAC sequences to the torus …
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Filter-bank transforms with exact inverses
… signal processing. It is shown that the Gabor and continuous wavelet transforms are special cases of the continuous-time extension. The methods introduced in the discrete-time case are used to derive all the linear time-invariant synthesis functions of these two transforms. A …
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Top-down and bottom-up interactions for cortical bursting
… of awake mice while presenting a battery of Gabor (bottom-up) and inverse (top-down) visual stimuli. We report widespread high-frequency bursts in L2/3 and L5 pyramidal neurons. Contrary to expectation, bursts exhibited extremely short response latencies, and were most strongly recruited by …
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New contributions on image fusion and compression based on space-frecuency representations = Nuevas contribuciones en fusión y compresión de imágenes basadas en representaciones espacio-frecuenciales
… one of them concerns the present work: the log-Gabor multiresolution transform proposed in [70, 68]. Its low spectral overlapping, high selectivity in orientation and scalability, shift-invariance, self-invertibility and complex de_nition confers e_ciency, versatility and robustness against …
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Adapting Seismic Processing Techniques for Data Preconditioning in Radar Imaging of Highly Dissipative and Dispersive Media
… of severe waveform distortion. Second, we adapt Gabor nonstationary deconvolution to accurately estimate the subsurface reflectivity in the presence of severe attenuation and dispersion due to EM wave propagation in highly lossy dispersive biological tissues at microwave frequencies. Third, we …
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Wave Propagation and Damage Characterization in Natural Fiber Hemp and LLDPE Composite
… from a thin disc-like specimen using the Gabor Wavelet Transform (GWT) so as to characterize the material. Detection of defect is also established using the generated waves and GWT. Using Gabor wavelet coefficients, the dispersion and attenuation of the specimen are determined in different …
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