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 8 of 8 for “"median filters"”.
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Weighted median filters and related nonlinear filters with applications in image processing
In the last few decades, a number of nonlinear filters were presented, especially in the electrical engineering literature. One of the most popular nonlinear filters is weighted median filtering. The main objective of this thesis is to analyse the statistical and deterministic properties of the …
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Improvements on conventional VSP processing and the use of spatial median filters
Includes bibliographical references.
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Boolean Weightless Neural Network Architectures
… is investigated through simulation of digital filters using a Type 1 Neuroram neuro-filter. Simulations have been performed using MATLAB to compare the results to a conventional median filter. Type 1 Neuroram has been tested on an extended collection of noise types. The importance of the …
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Median filtering for target detection in an airborne threat warning system
… and noise. The use of unsharp masking with median filter masking operators is recommended. Experiments involving simulated imagery are described, and the performance of median filter unsharp masking is found to be superior to that of the Laplacian filter, the linear point detection filter, …
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Tilt-Compensated Magnetic Field Sensor
… and implementation. Finite impulse response filters are designed and implemented in hardware to filter the acquired magnetic signals. Various designs of median filters are simulated and tested for smoothing inclination signal irregularities and noise. Trigonometric conversions necessary for …
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Seismic Site Characterization for the Deep Science and Engineering Laboratory (DUSEL) at Kimballton, Virginia
… constrain near surface velocities, the use of 2D median filters to remove ground roll, and stacking only offsets exceeding 500 m. Interpretation of seismic data supports a triplicated stratigraphic section caused by the stacking of the the St. Clair and Narrows thrust sheets. The St. Clair and …
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Signal estimation techniques using Lp-norm optimal stack filters with applications to image and video processing
The class of median-related operators called the stack filters are well-known for outperforming linear filtering in many applications which involve restoration of signals corrupted with impulsive noise, when sharp edges are to be preserved. Various subclasses of stack filters, such as the rank …
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Motion picture restoration
… has been traditionally achieved by the use of median filter structures. A new three dimensional multilevel median structure is presented in this work with the additional use of a detector which limits the distortion caused by the filters . This technique is found to be extremely effective in …