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 21 for “"Gabor Filter"”.
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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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Appearance Based Stage Recognition of Drosophila Embryos
… method using orientation histograms and Gabor filter. Furthermore, we apply Principal Component Analysis to reduce the dimension of the low-level features, aiming to accelerate the speed of recognition. With the experiments on BDGP images, we show the promise of the proposed method.
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Ocular Biometrics: Human Recognition in Challenging Conditions
… (SIFT) and a fusion method utilizing SIFT and Gabor filter encoding.
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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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Facial Expression Recognition: Fusion of A Human Vision System Model and A statistical framework
… of local methods with an efficient encoding of Gabor filter outputs and a combination of classifiers based on PCA and FLD. In addition, the sensitivity of existing expression recognition algorithms to facial identity and its variations is overcome by a novel composite orthonormal basis that …
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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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Retinal vessel segmentation using textons
… method employs textons. We propose a new filter bank (MR11) that includes bar detectors for vascular feature extraction and other kernels to detect edges and photometric variations in the image. The k-means clustering algorithm is adopted for texton generation based on the vessel and …
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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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Designing a Visual Front End in Audio-Visual Automatic Speech Recognition System
… three algorithms are studied and compared: the Gabor filter algorithm, the lip enhancement algorithm, and the modified Viola-Jones algorithm for lip features. Finally, to increase detection rate, a modified Viola-Jones algorithm and lip enhancement algorithms are cascaded based on the results of …
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RGB and NIR Image Registration for Proximal Multiband Imaging
… baseline distances. The Census transform, Gabor filter, and Color Index of Vegetation Extraction (CIVE) vegetation index were used as preprocessing filters to minimize radiometric differences and enhance cross-spectral comparability. It was found that metrics using the Gabor and CIVE …
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Novel Pixel-Level and Subpixel-Level Registration Algorithms for Multi-Modal Imagery Data
… scheme based on minimizing the latency of a Gabor filter bank by exploiting certain biological considerations is presented. The dissertation also introduces an extension of using local frequency to solve the sub-pixel image registration problem. The new algorithm is based on using the scaled …
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Machine learning methods for discriminating natural targets in seabed imagery
… methods on sonar waterfall imagery show that Gabor filter banks yield some of the best results. A further empirical investigation into the filter bank features created on sonar mosaic imagery leads to the identification of a useful configuration and filter parameter ranges for discriminating …
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Improved Intermittent Clutter Filtering For Wind Profiler Radar
… therefore especially deal with the problem of filtering of these unwanted contributions, to avoid associated measurement errors. A specific difficulty are clutter echoes from various airborne objects, such as aircraft or birds, which generate strong, intermittent contributions to the received …
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Tsunami monitoring using airglow imaging systems
Tsunamis generate internal gravity waves (IGWs) that propagate vertically into the atmosphere and can create detectable signatures in the ionosphere. These signatures have consistently been observed in the presence of a tsunami for over a decade in the total electron content and for over 5 years in …
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On the performance of convolutional neural networks initialized with Gabor filters.
… have found that the pattern on the kernel filters (convolution window) of the receptive 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 …
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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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Intelligent Road Control System Using Advanced Image Processing Techniques
… In the vehicle tracking part, SVM trained by Gabor and edge features is involved to segment the first frame of a given video, which captured by an in-car camera. Another Wavelet feature based SVM is utilized to tracking this specific vehicle. In the collision warning part, the Time to …
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Estimation of the vertical wavelength of atmospheric gravity waves from airglow imagery
Abstract In the summer of 2010, two imagers were installed in New Mexico with the objective of making stereoscopic observations of atmospheric gravity waves (AGWs). As AGWs propagate vertically, they spatially perturb the airglow emission layers in all three dimensions. Estimates of the vertical …
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Spatio-temporal localization of canonical dynamic stall flow scales across varying Reynolds numbers
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01
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