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Theses/Dissertations

1995

Communications and signal processing

Articles 1 - 4 of 4

Full-Text Articles in Engineering

Image Fusion Using Multi-Resolution Decomposition And Lmmse Filter , Jaewon Yim Jan 1995

Image Fusion Using Multi-Resolution Decomposition And Lmmse Filter , Jaewon Yim

Retrospective Theses and Dissertations

The subject of data fusion utilizing heterogeneous sensors has received significant attention in recent years. Each of the sensors provides a limited perspective of the desired information. A heterogeneous sensor environment combined with a procedure for synergistically combining data from each of the transducers can potentially lead to a more comprehensive and accurate estimate of the desired information. An example of a field that can profit from the application of data fusion techniques is the area of nondestructive evaluation (NDE);This dissertation is concerned with developing efficient image fusion techniques for NDE applications. This dissertation begins with a brief description ...


Automated Image Inspection Using Wavelet Decomposition And Fuzzy Rule-Based Classifier , Zhong Zhang Jan 1995

Automated Image Inspection Using Wavelet Decomposition And Fuzzy Rule-Based Classifier , Zhong Zhang

Retrospective Theses and Dissertations

A general purpose image inspecting system has been developed for automatic flaw detection in industrial applications. The system has a general purpose image understanding architecture that performs local feature extraction and supervised classification. Local features of an image are extracted from the compactly supported wavelet transform of the image. The features extracted from the wavelet transform provide local harmonic analysis and multi-resolution representation of the image. Image segmentation is achieved by classifying image pixels based on features extracted within a local area near each pixel. The supervised classifier used in the segmentation process is a fuzzy rule-based classifier which is ...


Modeling Of The Head-Related Transfer Functions For Reduced Computation And Storage , Charles Duncan Lueck Jan 1995

Modeling Of The Head-Related Transfer Functions For Reduced Computation And Storage , Charles Duncan Lueck

Retrospective Theses and Dissertations

The synthesis of three-dimensional sound via headphones generally requires the implementation of rather complex filters based on the head-related transfer functions (HRTFs), direction-specific transfer functions which simulate the transformation of sound pressure between a sound source and the eardrums of the listener. Current implementations generally rely on FIR filtering techniques, resulting in high computational complexity. The main objective of this work was to develop a set of computationally efficient filters which would be capable of emulating the head-related transfer functions. To accomplish this objective, a modification of conventional system modeling techniques through the application of psychoacoustic principles has been applied ...


Nde Data Fusion Using Phenomenological Approaches , Kai Sun Jan 1995

Nde Data Fusion Using Phenomenological Approaches , Kai Sun

Retrospective Theses and Dissertations

Data fusion techniques are beginning to attract considerable attention. In the NDE context, such techniques can be used to combine information from two or more NDE test methods to improve the probability of detection and enhance characterization results. An example of such an application involves the fusion of eddy current and ultrasonic NDE data. The eddy current phenomena relies on the diffusion process to propagate energy. Ultrasonic phenomena, in contrast, rely on wave propagation. The manner in which the energy interacts with the material under test is fundamentally different. It can therefore be argued that each test method provides a ...