Prof. Ahmed H. Tewfik Profile

Prof. Ahmed H. Tewfik

at Univ of Minnesota/Twin Cities

SPIE Involvement:

Author

Publications (27)

Proceedings Article | 11 March 2011 Paper

Real-time cardiac surface tracking from sparse samples using subspace clustering and maximum-likelihood linear regressors

Vimal Singh, Ahmed Tewfik

Proceedings Volume 7962, 796213 (2011) https://doi.org/10.1117/12.877602

KEYWORDS: Spherical lenses, 3D modeling, Surgery, 3D image processing, Shape analysis, Image segmentation, Data modeling, Atrial fibrillation, Echocardiography, Visualization

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Proceedings Article | 29 April 2002 Paper

Adaptive watermarking using successive subband quantization and perceptual model based on multiwavelet transform

Ki Kwon, Ahmed Tewfik

Proceedings Volume 4675, (2002) https://doi.org/10.1117/12.465291

KEYWORDS: Digital watermarking, Wavelets, Image compression, Quantization, Stochastic processes, Image quality, Visibility, Transparency, Matrices, Filtering (signal processing)

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Proceedings Article | 26 November 2001 Paper

Optimal simplex beam-forms for radar target localization

Ayman Abdel-Samad, Ahmed Tewfik

Proceedings Volume 4473, (2001) https://doi.org/10.1117/12.492750

KEYWORDS: Radar, Signal to noise ratio, Receivers, Optical spheres, Transmitters, Sensors, Matrices, Computer engineering, Mathematical modeling, Data processing

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Proceedings Article | 1 August 2001 Paper

Techniques for data embedding in image using wavelet extrema

Mohamed Mansour, Ahmed Tewfik

Proceedings Volume 4314, (2001) https://doi.org/10.1117/12.435414

KEYWORDS: Wavelets, Visualization, Digital watermarking, Distortion, Wavelet transforms, Signal processing, Reconstruction algorithms, Linear filtering, Digital filtering, Filtering (signal processing)

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Proceedings Article | 1 January 2001 Paper

Wipe transition detection using polynomial interpolation

Jeho Nam, Ahmed Tewfik

Proceedings Volume 4315, (2001) https://doi.org/10.1117/12.410932

KEYWORDS: Video, Image filtering, Wavelets, Linear filtering, Detection and tracking algorithms, Radon transform, Sensors, Image resolution, Semantic video, Video compression

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Proceedings Article | 12 June 2000 Paper

Acoustic emission classification for failure prediction due to mechanical fatigue

Vahid Emamian, Mostafa Kaveh, Ahmed Tewfik

Proceedings Volume 3986, (2000) https://doi.org/10.1117/12.388094

KEYWORDS: Sensors, Signal detection, Acoustic emission, Principal component analysis, Neural networks, Metals, Time-frequency analysis, Data centers, Neurons, Signal generators

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Proceedings Article | 9 May 2000 Paper

Geometric distortion correction in image watermarking

Masoud Alghoniemy, Ahmed Tewfik

Proceedings Volume 3971, (2000) https://doi.org/10.1117/12.385011

KEYWORDS: Wavelets, Digital watermarking, Cameras, Factor analysis, Wavelet transforms, Image restoration, Image filtering, Linear filtering, Image analysis, Receivers

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Proceedings Article | 31 May 1999 Paper

Fault monitoring using acoustic emissions

Danlu Zhang, Gopal Venkatesan, Mostafa Kaveh, Ahmed Tewfik, Kevin Buckley

Proceedings Volume 3670, (1999) https://doi.org/10.1117/12.349752

KEYWORDS: Sensors, Signal detection, Interference (communication), Data modeling, Signal to noise ratio, Acoustic emission, Signal processing, Wave propagation, Inspection, Ultrasonics

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Proceedings Article | 14 October 1998 Paper

Optimal sequential search technique for radar target localization

Ayman Abdel-Samad, Ahmed Tewfik

Proceedings Volume 3462, (1998) https://doi.org/10.1117/12.326748

KEYWORDS: Radar, Binary data, Transmitters, Receivers, Target acquisition, Target detection, Signal to noise ratio, Data communications, Internet, Computer engineering

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SPIE Journal Paper | 1 July 1998

Fast progressively refined image retrieval

Mitchell Swanson, Ahmed Tewfik

JEI, Vol. 7, Issue 03, (July 1998) https://doi.org/10.1117/12.10.1117/1.482611

KEYWORDS: Image retrieval, Image compression, Databases, Prototyping, Associative arrays, Image quality, Wavelets, Wavelet transforms, Image segmentation, Image storage

Proceedings Article | 9 January 1998 Paper

Motion-based video object indexing using multiresolution analysis

Jeho Nam, Ahmed Tewfik

Proceedings Volume 3309, (1998) https://doi.org/10.1117/12.298380

KEYWORDS: Video, Wavelet transforms, Wavelets, Databases, Motion analysis, Multimedia, Image analysis, 3D image processing, 3D modeling, Cameras

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Proceedings Article | 6 October 1997 Paper

Video data hiding for video-in-video and other applications

Mitchell Swanson, Bin Zhu, Ahmed Tewfik

Proceedings Volume 3229, (1997) https://doi.org/10.1117/12.290362

KEYWORDS: Video, Data hiding, Video compression, Error control coding, Data modeling, Visualization, Quantization, Video coding, Signal to noise ratio, Computer security

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Proceedings Article | 6 October 1997 Paper

Multiresolution image retrieval using B-splines

Mitchell Swanson, Ahmed Tewfik

Proceedings Volume 3229, (1997) https://doi.org/10.1117/12.290358

KEYWORDS: Image retrieval, Databases, Associative arrays, Image compression, Prototyping, Wavelet transforms, Wavelets, Image segmentation, Content based image retrieval, Image quality

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Proceedings Article | 27 February 1996 Paper

Efficient coding of wavelet trees and its applications in image coding

Bin Zhu, En-hui Yang, Ahmed Tewfik, John Kieffer

Proceedings Volume 2727, (1996) https://doi.org/10.1117/12.233266

KEYWORDS: Wavelets, Image compression, Associative arrays, Wavelet transforms, Image filtering, Image information entropy, Binary data, Aluminum, Protactinium, Linear filtering

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Proceedings Article | 27 February 1996 Paper

Wavelet domain textual coding of Ottoman script images

Oemer Gerek, Enis Cetin, Ahmed Tewfik

Proceedings Volume 2727, (1996) https://doi.org/10.1117/12.233272

KEYWORDS: Image compression, Stereolithography, Wavelets, Computer programming, Image filtering, Nonlinear filtering, Chromium, Databases, Wavelet transforms, Image resolution

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Proceedings Article | 27 February 1996 Paper

Image coding for content-based retrieval

Mitchell Swanson, Srinath Hosur, Ahmed Tewfik

Proceedings Volume 2727, (1996) https://doi.org/10.1117/12.233177

KEYWORDS: Image compression, Image retrieval, Image segmentation, Databases, Image transmission, Quantization, Image storage, Wavelet transforms, Image processing algorithms and systems, Associative arrays

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Proceedings Article | 25 April 1995 Paper

Wavelets: a passing wave or a truly useful tool?

A. Tewfik

Proceedings Volume 10279, 102790A (1995) https://doi.org/10.1117/12.204215

KEYWORDS: Wavelets, Wavelet transforms, Signal processing, Stochastic processes, Discrete wavelet transforms

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Proceedings Article | 6 April 1995 Paper

Low bit rate near-transparent image coding

Bin Zhu, Ahmed Tewfik, Oemer Gerek

Proceedings Volume 2491, (1995) https://doi.org/10.1117/12.205384

KEYWORDS: Quantization, Wavelets, Image compression, Visual process modeling, Visualization, Image quality, Wavelet transforms, Distortion, Data modeling, Linear filtering

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Proceedings Article | 6 April 1995 Paper

Multiple target class adaptive wideband radar imaging

Sameh Sowelam, Ahmed Tewfik

Proceedings Volume 2491, (1995) https://doi.org/10.1117/12.205400

KEYWORDS: Reflectivity, Radar, Detection and tracking algorithms, Wavelets, Radar imaging, Wavelet transforms, Sensors, Reconstruction algorithms, Matrices, Library classification systems

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SPIE Journal Paper | 1 August 1994

Recent progress in the application of wavelets in surveillance systems

Ahmed Tewfik, Srinath Hosur, Sameh Sowelam

OE, Vol. 33, Issue 08, (August 1994) https://doi.org/10.1117/12.10.1117/12.176505

KEYWORDS: Wavelets, Doppler effect, Radar, Synthetic aperture radar, Image resolution, Radar imaging, Algorithm development, Reconstruction algorithms, Matrices, Surveillance systems

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Proceedings Article | 15 March 1994 Paper

Perfect reconstruction filter banks with arbitrary regularity

Ahmed Tewfik

Proceedings Volume 2242, (1994) https://doi.org/10.1117/12.170081

KEYWORDS: Wavelets, Linear filtering, Matrices, Mirrors, Electronic filtering, Electrical engineering, Fourier transforms, Radon

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Proceedings Article | 15 March 1994 Paper

Recent progress in the application of wavelets in surveillance systems

Ahmed Tewfik, Srinath Hosur

Proceedings Volume 2242, (1994) https://doi.org/10.1117/12.170033

KEYWORDS: Wavelets, Radar, Image resolution, Doppler effect, Algorithm development, Synthetic aperture radar, Reconstruction algorithms, Radar imaging, Fourier transforms, Wavelet transforms

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Proceedings Article | 15 March 1994 Paper

Real-time implementation of second generation of audio multilevel information coding

Murtaza Ali, Ahmed Tewfik, V. Viswanathan

Proceedings Volume 2242, (1994) https://doi.org/10.1117/12.170026

KEYWORDS: Wavelets, Wavelet transforms, Computer programming, Linear filtering, Compact discs, Digital signal processing, Discrete wavelet transforms, Signal analyzers, Signal processing, Error analysis

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Proceedings Article | 13 April 1993 Paper

Fast wavelet-based magnetic resonance imaging

Ahmed Tewfik, Hichem Garnaoui, Xiaoping Hu

Proceedings Volume 1838, (1993) https://doi.org/10.1117/12.142787

KEYWORDS: Wavelets, Magnetic resonance imaging, Fourier transforms, Linear filtering, Machine vision, Computer vision technology, Scanners, Signal to noise ratio, Wavelet transforms, Magnetism

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Proceedings Article | 1 November 1990 Paper

Filtered fractals and texture analysis

Ahmed Tewfik, M. Deriche

Proceedings Volume 1349, (1990) https://doi.org/10.1117/12.23535

KEYWORDS: Autoregressive models, Motion models, Visual process modeling, Fractal analysis, Image processing, Electronic filtering, Signal processing, Digital image processing, Gaussian filters, Electrical engineering

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Proceedings Article | 1 November 1990 Paper

Multiscale signal detection in fractional Brownian motion

Ahmed Tewfik, Myoungjin Kim

Proceedings Volume 1348, (1990) https://doi.org/10.1117/12.23499

KEYWORDS: Signal detection, Motion models, Optimal filtering, Linear filtering, Detection and tracking algorithms, Interference (communication), Sensors, Algorithm development, Atmospheric modeling, Physics

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Proceedings Article | 1 June 1990 Paper

Comparison of parametric and nonparametric edge-detection algorithms

Afshin Amini, Ahmed Tewfik

Proceedings Volume 1244, (1990) https://doi.org/10.1117/12.19531

KEYWORDS: Sensors, Autoregressive models, Detection and tracking algorithms, Edge detection, Image processing, Image segmentation, Data modeling, Visual process modeling, Image filtering, Image processing algorithms and systems

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Showing 5 of 27 publications

Conference Committee Involvement (2)

Storage and Retrieval for Media Databases 2003

22 January 2003 | Santa Clara, CA, United States

Security and Watermarking of Multimedia Contents V

21 January 2003 | Santa Clara, CA, United States

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