Prof. William J. Williams Profile

Prof. William J. Williams

Professor Emeritus at Univ of Michigan

SPIE Involvement:

Conference Program Committee | Author

Publications (26)

PROCEEDINGS ARTICLE | August 25, 2006

Application of time-frequency analysis methods to speaker verification

Proc. SPIE. 6313, Advanced Signal Processing Algorithms, Architectures, and Implementations XVI

KEYWORDS: Biometrics, Databases, Mouth, Lung, Tongue, Signal processing, Analytical research, Algorithm development, Speaker recognition, Time-frequency analysis

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PROCEEDINGS ARTICLE | December 24, 2003

Scale and translation invariant shape and signal classification and detection

Proc. SPIE. 5205, Advanced Signal Processing Algorithms, Architectures, and Implementations XIII

KEYWORDS: Radar, Doppler effect, Backscatter, Image processing, Fourier transforms, Ocean optics, Image classification, Oceanography, Signal detection, Time-frequency analysis

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PROCEEDINGS ARTICLE | December 6, 2002

Time-frequency-guided quadratic filters

Proc. SPIE. 4791, Advanced Signal Processing Algorithms, Architectures, and Implementations XII

KEYWORDS: MATLAB, Fourier transforms, Interference (communication), Linear filtering, Electronic filtering, Electrical engineering, Signal detection, Filtering (signal processing), Time-frequency analysis, Quantum computing

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PROCEEDINGS ARTICLE | November 20, 2001

Renyi information for extracting features from TFDs

Proc. SPIE. 4474, Advanced Signal Processing Algorithms, Architectures, and Implementations XI

KEYWORDS: Information fusion, Tissues, Video, Fourier transforms, Computer science, Signal processing, Electrical engineering, Signal detection, Time-frequency analysis, Epilepsy

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PROCEEDINGS ARTICLE | November 20, 2001

Time-frequency analysis of laser weld signature

Proc. SPIE. 4474, Advanced Signal Processing Algorithms, Architectures, and Implementations XI

KEYWORDS: Infrared sensors, Sensors, Ultraviolet radiation, Laser welding, Signal processing, Gas lasers, Infrared radiation, Acoustic emission, Signal analyzers, Time-frequency analysis

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PROCEEDINGS ARTICLE | November 20, 2001

Minimum entropy approach to denoising time-frequency distributions

Proc. SPIE. 4474, Advanced Signal Processing Algorithms, Architectures, and Implementations XI

KEYWORDS: Signal to noise ratio, Visualization, Wavelets, Denoising, Fourier transforms, Interference (communication), Smoothing, Probability theory, Time-frequency analysis, Image information entropy

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PROCEEDINGS ARTICLE | November 13, 2000

Application of time-frequency analysis to high-power microwave devices

Proc. SPIE. 4116, Advanced Signal Processing Algorithms, Architectures, and Implementations X

KEYWORDS: Electron beams, Waveguides, Dispersion, Magnetism, Fourier transforms, Frequency modulation, High power microwaves, Microwave radiation, Pulsed power, Time-frequency analysis

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PROCEEDINGS ARTICLE | November 13, 2000

Optimal warping function design for discrete time-warped Fourier transforms

Proc. SPIE. 4116, Advanced Signal Processing Algorithms, Architectures, and Implementations X

KEYWORDS: Fourier transforms, Transform theory, Numerical analysis, Signal processing, Solids, System identification, Signal generators, Information theory, Optimization (mathematics), Probability theory

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PROCEEDINGS ARTICLE | November 13, 2000

Discrete scale vectors and decomposition of time-frequency kernels

Proc. SPIE. 4116, Advanced Signal Processing Algorithms, Architectures, and Implementations X

KEYWORDS: Matrices, Wavelets, Fourier transforms, Computer science, Signal processing, Electrical engineering, Space operations, Signal analyzers, Time-frequency analysis, Lead

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PROCEEDINGS ARTICLE | July 14, 2000

Experiments on slotted coaxial high-power gyrotrons

Proc. SPIE. 4031, Intense Microwave Pulses VII

KEYWORDS: Electron beams, Oscillators, Magnetism, Diagnostics, Diodes, High power microwaves, Medium wave, Microwave radiation, S band, Plasma

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PROCEEDINGS ARTICLE | November 2, 1999

Minimal-window time-frequency distributions

Proc. SPIE. 3807, Advanced Signal Processing Algorithms, Architectures, and Implementations IX

KEYWORDS: Radon, Matrices, Wavelets, Fourier transforms, Computer science, Signal processing, Smoothing, Electrical engineering, Time-frequency analysis, Algorithms

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PROCEEDINGS ARTICLE | November 2, 1999

Discrete implementations of scale transform

Proc. SPIE. 3807, Advanced Signal Processing Algorithms, Architectures, and Implementations IX

KEYWORDS: Error analysis, Image restoration, Fourier transforms, Signal processing, Solids, Discretization errors, Image filtering, Biological research, Algorithm development, Signal analyzers

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PROCEEDINGS ARTICLE | November 2, 1999

Generalized scale transforms

Proc. SPIE. 3807, Advanced Signal Processing Algorithms, Architectures, and Implementations IX

KEYWORDS: Nickel, Fourier transforms, Computer science, Transform theory, Signal processing, Information technology, Convolution, Electronic filtering, Electrical engineering, Time-frequency analysis

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PROCEEDINGS ARTICLE | October 2, 1998

Cross Hilbert time-frequency distributions

Proc. SPIE. 3461, Advanced Signal Processing Algorithms, Architectures, and Implementations VIII

KEYWORDS: Surface plasmons, Fourier transforms, Computer science, Signal processing, Mathematics, Convolution, Electrical engineering, Signal analyzers, Time-frequency analysis, Algorithms

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PROCEEDINGS ARTICLE | October 2, 1998

New signal adaptive approach for the reduction of interference terms in quadratic time-frequency distributions

Proc. SPIE. 3461, Advanced Signal Processing Algorithms, Architectures, and Implementations VIII

KEYWORDS: Nickel, Interference (communication), Linear filtering, Frequency modulation, Signal processing, Smoothing, Spectral resolution, Electrical engineering, Time-frequency analysis, Correlation function

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PROCEEDINGS ARTICLE | October 24, 1997

Pattern recognition under translation and scale changes

Proc. SPIE. 3162, Advanced Signal Processing: Algorithms, Architectures, and Implementations VII

KEYWORDS: Image segmentation, Pattern recognition, Interference (communication), Feature extraction, Signal processing, Solids, Image classification, Raster graphics, Signal detection, Time-frequency analysis

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PROCEEDINGS ARTICLE | October 24, 1997

Wavelet windowed time-frequency distribution decompositions

Proc. SPIE. 3162, Advanced Signal Processing: Algorithms, Architectures, and Implementations VII

KEYWORDS: Radar, Wavelet transforms, Doppler effect, Backscatter, Matrices, Wavelets, Fourier transforms, Signal analyzers, Time-frequency analysis, Algorithms

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PROCEEDINGS ARTICLE | October 22, 1996

Separating desired image and signal invariant components from extraneous variations

Proc. SPIE. 2846, Advanced Signal Processing Algorithms, Architectures, and Implementations VI

KEYWORDS: Contamination, Image segmentation, Matrices, Image processing, Pattern recognition, Signal processing, Image classification, Raster graphics, Optical character recognition, Time-frequency analysis

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PROCEEDINGS ARTICLE | October 22, 1996

Kalman filtering and time-frequency distribution of random signals

Proc. SPIE. 2846, Advanced Signal Processing Algorithms, Architectures, and Implementations VI

KEYWORDS: Signal to noise ratio, Error analysis, Interference (communication), Temporal resolution, Smoothing, Electronic filtering, Detection theory, Stochastic processes, Filtering (signal processing), Time-frequency analysis

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PROCEEDINGS ARTICLE | October 22, 1996

Statistics for Cohen's class distribution of white Gaussian noise

Proc. SPIE. 2846, Advanced Signal Processing Algorithms, Architectures, and Implementations VI

KEYWORDS: Radon, Statistical analysis, Fourier transforms, Interference (communication), Computer simulations, Signal processing, Signal analysis, Convolution, Electrical engineering, Time-frequency analysis

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PROCEEDINGS ARTICLE | June 7, 1995

Time-frequency analysis of radar target backscatter

Proc. SPIE. 2563, Advanced Signal Processing Algorithms

KEYWORDS: Radar, Optical spheres, Doppler effect, Backscatter, Scattering, Error analysis, Signal analyzers, Electromagnetism, Electromagnetic scattering, Time-frequency analysis

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PROCEEDINGS ARTICLE | June 7, 1995

Decomposition of time-frequency distributions using scaled-window spectrograms

Proc. SPIE. 2563, Advanced Signal Processing Algorithms

KEYWORDS: Visualization, Matrices, Wavelets, Fourier transforms, Computer science, Mathematics, Electrical engineering, Algorithm development, Yield improvement, Time-frequency analysis

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PROCEEDINGS ARTICLE | November 30, 1992

Decomposition of time-frequency distribution kernels

Proc. SPIE. 1770, Advanced Signal Processing Algorithms, Architectures, and Implementations III

KEYWORDS: Surface plasmons, Fourier transforms, Computer science, Signal processing, Spectral resolution, Analytical research, Electrical engineering, Signal analyzers, Optical correlators, Time-frequency analysis

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PROCEEDINGS ARTICLE | November 30, 1992

High-spectral-resolution time-frequency distribution kernels

Proc. SPIE. 1770, Advanced Signal Processing Algorithms, Architectures, and Implementations III

KEYWORDS: Statistical analysis, Matrices, Fourier transforms, Linear filtering, Spectral resolution, Electronic filtering, Electrical engineering, Autoregressive models, Time-frequency analysis, Amplitude modulation

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PROCEEDINGS ARTICLE | December 1, 1991

Uncertainty, information, and time-frequency distributions

Proc. SPIE. 1566, Advanced Signal Processing Algorithms, Architectures, and Implementations II

KEYWORDS: Wavelet transforms, Particles, Fourier transforms, Computer science, Signal processing, Signal analysis, Quantum mechanics, Electrical engineering, Signal detection, Time-frequency analysis

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