Prof. William Clem Karl Profile

Prof. William Clem Karl

Research Scientist at Boston Univ

SPIE Involvement:

Author

Publications (45)

Proceedings Article | 1 May 2017 Paper

Performance estimation for threat detection in CT systems

Trent Montgomery, W. Clem Karl, David Castañón

Proceedings Volume 10187, 101870M (2017) https://doi.org/10.1117/12.2276654

KEYWORDS: Sensors, Statistical analysis, Error analysis, Photodetectors, Signal attenuation, X-rays, Photon counting, Information theory, Reconstruction algorithms, Inspection

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Proceedings Article | 7 March 2014 Paper

Joint metal artifact reduction and material discrimination in x-ray CT using a learning-based graph-cut method

Limor Martin, Ahmet Tuysuzoglu, Prakash Ishwar, W. Clem Karl

Proceedings Volume 9020, 902007 (2014) https://doi.org/10.1117/12.2048873

KEYWORDS: Metals, Signal attenuation, Image segmentation, Data modeling, X-ray computed tomography, X-rays, Homeland security, Security technologies, Binary data, Image analysis

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Proceedings Article | 23 May 2013 Paper

Joint reconstruction of interrupted SAR imagery for persistent surveillance change detection

Ivana Stojanovic, Les Novak, W. Karl

Proceedings Volume 8746, 87460L (2013) https://doi.org/10.1117/12.2020653

KEYWORDS: Synthetic aperture radar, Charge-coupled devices, Reconstruction algorithms, Surveillance, Target detection, Image processing, Data processing, Reflectivity, Data modeling, Image filtering

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Proceedings Article | 14 February 2013 Paper

Joint reconstruction and segmentation of electron tomography data

Ahmet Tuysuzoglu, W. Karl, David Castanon, M. Selim Unlu

Proceedings Volume 8657, 86570T (2013) https://doi.org/10.1117/12.2013232

KEYWORDS: Image segmentation, Tomography, Electron tomography, Binary data, Image filtering, Digital filtering, Chemical elements, Reconstruction algorithms, Fusion energy, Signal to noise ratio

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Proceedings Article | 3 May 2012 Paper

Reconstruction of interrupted SAR imagery for persistent surveillance change detection

Ivana Stojanovic, W. Karl, Les Novak

Proceedings Volume 8394, 839408 (2012) https://doi.org/10.1117/12.925069

KEYWORDS: Synthetic aperture radar, Point spread functions, Charge-coupled devices, Data modeling, Radar, Reflectivity, CCD image sensors, Reconstruction algorithms, Image filtering, Surveillance

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Proceedings Article | 16 March 2011 Paper

High-order noise analysis for low dose iterative image reconstruction methods: ASIR, IRIS, and MBAI

Synho Do, Sarabjeet Singh, Mannudeep Kalra, W. Clem Karl, Thomas Brady, Homer Pien

Proceedings Volume 7961, 79610I (2011) https://doi.org/10.1117/12.878222

KEYWORDS: IRIS Consortium, Scanners, Image restoration, Medical imaging, Modulation transfer functions, Visualization, Statistical analysis, Image filtering, Sensors, Computed tomography

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Proceedings Article | 8 February 2011 Paper

Classification-aware dimensionality reduction methods for explosives detection using multi-energy x-ray computed tomography

Limor Eger, Prakash Ishwar, W. Karl, Homer Pien

Proceedings Volume 7873, 78730Q (2011) https://doi.org/10.1117/12.888064

KEYWORDS: Explosives, Signal attenuation, X-ray computed tomography, Explosives detection, X-rays, Statistical analysis, Feature extraction, Receivers, Photons, Databases

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Proceedings Article | 23 March 2010 Paper

Clinical low dose CT image reconstruction using high-order total variation techniques

Synho Do, W. Clem Karl, Mannudeep Kalra, Thomas Brady, Homer Pien

Proceedings Volume 7622, 76225D (2010) https://doi.org/10.1117/12.844307

KEYWORDS: Systems modeling, Image restoration, Imaging systems, Data modeling, CT reconstruction, Image quality, 3D modeling, Computed tomography, Medical imaging, In vivo imaging

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Proceedings Article | 24 February 2010 Paper

Compressed sensing in optical coherence tomography

Nishant Mohan, Ivana Stojanovic, W. Karl, Bahaa Saleh, Malvin Teich

Proceedings Volume 7570, 75700L (2010) https://doi.org/10.1117/12.844217

KEYWORDS: Optical coherence tomography, Compressed sensing, Chemical elements, Charge-coupled devices, Medicine, CCD image sensors, Sensors, Photodiodes, Detector arrays, Speckle

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Proceedings Article | 29 April 2009 Paper

Compressed sensing of mono-static and multi-static SAR

Ivana Stojanovic, W. Clem Karl, Mujdat Cetin

Proceedings Volume 7337, 733705 (2009) https://doi.org/10.1117/12.818808

KEYWORDS: Synthetic aperture radar, Compressed sensing, Receivers, Transmitters, Reconstruction algorithms, Electroluminescence, Sensors, Chemical elements, Antennas, Scattering

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Proceedings Article | 13 March 2009 Paper

Noise properties of iterative reconstruction techniques in low-dose CT scans

Synho Do, Mannudeep Kalra, Zhuangli Liang, W. Clem. Karl, Thomas Brady, Homer Pien

Proceedings Volume 7258, 725829 (2009) https://doi.org/10.1117/12.811597

KEYWORDS: Reconstruction algorithms, Computed tomography, Image resolution, Angiography, X-ray computed tomography, Scanners, Medical imaging, Visualization, Signal to noise ratio, Tissues

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Proceedings Article | 15 April 2008 Paper

Joint space aspect reconstruction of wide-angle SAR exploiting sparsity

Ivana Stojanovic, Mujdat Cetin, William Karl

Proceedings Volume 6970, 697005 (2008) https://doi.org/10.1117/12.786288

KEYWORDS: Reconstruction algorithms, Reflectivity, Synthetic aperture radar, Scattering, Signal to noise ratio, Image processing, Composites, Detection and tracking algorithms, Spatial frequencies, Error analysis

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Proceedings Article | 18 March 2008 Paper

A projection-driven pre-correction technique for iterative reconstruction of helical cone-beam cardiac CT images

Synho Do, Zhuangli Liang, William Clem Karl, Thomas Brady, Homer Pien

Proceedings Volume 6913, 69132U (2008) https://doi.org/10.1117/12.770187

KEYWORDS: Reconstruction algorithms, Tomography, Computed tomography, In vivo imaging, Electrocardiography, Sensors, Iterative methods, Image resolution, Image processing, Heart

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Proceedings Article | 18 March 2008 Paper

Cardiac CT artifact mitigation through decomposition-based image reconstruction

Zhuangli Liang, Synho Do, W. Clem Karl, Thomas Brady, Homer Pien

Proceedings Volume 6913, 69131X (2008) https://doi.org/10.1117/12.770436

KEYWORDS: Calcium, Image processing, Computed tomography, Tissues, Arteries, Scanners, Data modeling, Image acquisition, Angiography, Image restoration

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Proceedings Article | 12 March 2008 Paper

A new deconvolution approach to perfusion imaging exploiting spatial correlation

Burkay Orten, W. Clem Karl, Dushyant Sahani, Homer Pien

Proceedings Volume 6916, 69160M (2008) https://doi.org/10.1117/12.770425

KEYWORDS: Deconvolution, Tissues, Surface conduction electron emitter displays, Tumors, Data modeling, Calcium, Blood, Convolution, Mathematical modeling, Blood circulation

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SPIE Journal Paper | 1 January 2006

Feature-preserving regularization method for complex-valued inverse problems with application to coherent imaging

Mujdat Çetin, William Karl, Alan Willsky

OE, Vol. 45, Issue 01, 017003, (January 2006) https://doi.org/10.1117/12.10.1117/1.2150368

KEYWORDS: Coherence imaging, 3D image reconstruction, Synthetic aperture radar, Ultrasonography, Image restoration, Data modeling, Speckle, Optical engineering, Inverse problems, Digital holography

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Proceedings Article | 24 March 2005 Paper

Using out-of-focus light to improve image acquisition time in confocal microscopy

Brynmor Davis, William Karl, Bennett Goldberg, Anna Swan, M. Selim Unlu

Proceedings Volume 5701, (2005) https://doi.org/10.1117/12.590640

KEYWORDS: Confocal microscopy, Image acquisition, Point spread functions, Optical transfer functions, Microscopes, Image processing, Signal to noise ratio, Sensors, Microscopy, Charge-coupled devices

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Proceedings Article | 2 November 2004 Paper

Design of a high-definition imaging (HDI) analysis technique adapted to challenging environments

Sophie Laurent, William Karl, Janusz Konrad, Jody Wilson, Jeffrey Baumgardner, Michael Mendillo

Proceedings Volume 5558, (2004) https://doi.org/10.1117/12.581739

KEYWORDS: Information operations, Mercury, Image quality, Image registration, Space telescopes, Telescopes, Point spread functions, Signal to noise ratio, Atmospheric optics, Adaptive optics

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Proceedings Article | 13 July 2004 Paper

Reconstruction of objects with a limited number of non-zero components in fluorescence microscopy

Brynmor Davis, William Karl, Anna Swan, Bennett Goldberg, M. Selim Unlu, Marcia Goldberg

Proceedings Volume 5324, (2004) https://doi.org/10.1117/12.527800

KEYWORDS: Point spread functions, Microscopy, Reconstruction algorithms, Luminescence, Confocal microscopy, Deconvolution, Algorithm development, Image resolution, Image processing, Data modeling

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Proceedings Article | 21 May 2004 Paper

Using shape distributions as priors in a curve evolution framework

Andrew Litvin, William Karl

Proceedings Volume 5299, (2004) https://doi.org/10.1117/12.525410

KEYWORDS: Visualization, Visual process modeling, Image segmentation, Data modeling, Distance measurement, Solids, Shape analysis, Feature extraction, Machine vision, Computer vision technology

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Proceedings Article | 18 January 2004 Paper

Multiple motion and occlusion segmentation with a multiphase level set method

Yonggang Shi, Janusz Konrad, William Karl

Proceedings Volume 5308, (2004) https://doi.org/10.1117/12.525144

KEYWORDS: Image segmentation, Video, Motion models, Algorithm development, Image processing algorithms and systems, Binary data, Motion estimation, Motion analysis, Video compression, Image analysis

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Proceedings Article | 1 July 2003 Paper

Tomographic reconstruction of dynamic objects

Yonggang Shi, William Karl

Proceedings Volume 5016, (2003) https://doi.org/10.1117/12.483902

KEYWORDS: 3D modeling, Tomography, Distance measurement, Data modeling, Algorithm development, Autoregressive models, Motion models, Reconstruction algorithms, Affine motion model, Optimization (mathematics)

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Proceedings Article | 15 May 2003 Paper

Curve evolution methods for dynamic tomography with unknown dynamic models

Yonggang Shi, William Karl, David Castanon

Proceedings Volume 5032, (2003) https://doi.org/10.1117/12.481883

KEYWORDS: Tomography, Data modeling, Autoregressive models, Affine motion model, Distance measurement, Reconstruction algorithms, Inverse problems, Single photon emission computed tomography, 3D modeling, Signal to noise ratio

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Proceedings Article | 7 May 2003 Paper

Probabilistic video stabilization using Kalman filtering and mosaicing

Andrey Litvin, Janusz Konrad, William Karl

Proceedings Volume 5022, (2003) https://doi.org/10.1117/12.476436

KEYWORDS: Video, Cameras, Motion models, Motion estimation, Affine motion model, Filtering (signal processing), Electronic filtering, Optical filters, Video processing, Digital filtering

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Proceedings Article | 1 August 2002 Paper

Analysis of the impact of feature-enhanced SAR imaging on ATR performance

Mujdat Cetin, William Karl, David Castanon

Proceedings Volume 4727, (2002) https://doi.org/10.1117/12.478673

KEYWORDS: Synthetic aperture radar, Automatic target recognition, Image classification, Target recognition, Reflectivity, Image resolution, Super resolution, Matrices, Signal to noise ratio, Image restoration

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Proceedings Article | 1 August 2002 Paper

Formation of HRR profiles by nonquadratic optimization for improved feature extraction

Mujdat Cetin, William Karl, David Castanon

Proceedings Volume 4727, (2002) https://doi.org/10.1117/12.478678

KEYWORDS: Feature extraction, Super resolution, Target recognition, Radar, Automatic target recognition, Synthetic aperture radar, Target acquisition, Data acquisition, Objectives, Chemical elements

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Proceedings Article | 15 May 2002 Paper

High-resolution spectral self-interference fluorescence microscopy

Anna Swan, Lev Moiseev, Yunjie Tong, Samuel Lipoff, William Karl, Bennett Goldberg, M. Selim Unlu

Proceedings Volume 4621, (2002) https://doi.org/10.1117/12.467834

KEYWORDS: Luminescence, Microscopy, Silicon, Mirrors, Image resolution, Data modeling, Spectral resolution, Objectives, Dielectrics, Microscopes

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Proceedings Article | 18 October 2001 Paper

Approaches to underground imaging for object localization

Vincenzo Galdi, William Karl, David Castanon, Leopold Felsen

Proceedings Volume 4394, (2001) https://doi.org/10.1117/12.445436

KEYWORDS: Interfaces, General packet radio service, Scattering, Dielectrics, Receivers, Statistical analysis, Gaussian beams, Data modeling, Reflection, Ground penetrating radar

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Proceedings Article | 24 August 2000 Paper

Evaluation of a regularized SAR imaging technique based on recognition-oriented features

Mujdat Cetin, William Karl, David Castanon

Proceedings Volume 4053, (2000) https://doi.org/10.1117/12.396369

KEYWORDS: Synthetic aperture radar, Image segmentation, Image acquisition, Speckle, Image resolution, Automatic target recognition, Super resolution, Image enhancement, Image restoration, Reflectivity

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Proceedings Article | 22 August 2000 Paper

GPR imaging approaches for buried plastic land mine detection

Haihua Feng, David Castanon, William Karl, Eric Miller

Proceedings Volume 4038, (2000) https://doi.org/10.1117/12.396236

KEYWORDS: Mining, General packet radio service, Receivers, Land mines, Data modeling, Tomography, Algorithm development, Reconstruction algorithms, Interfaces, Information operations

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Proceedings Article | 4 August 2000 Paper

Ultrasound analysis of vascular structure and deformation

Ray Chan, John Kaufhold, Robert Lees, William Karl

Proceedings Volume 4037, (2000) https://doi.org/10.1117/12.395046

KEYWORDS: Tissues, Ultrasonography, Image processing, Arteries, Motion estimation, Finite element methods, Optical flow, Injuries, Blood pressure, Matrices

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Proceedings Article | 21 December 1999 Paper

Land mine detection through GPR and EMI sensor fusion

Robert Weisenseel, David Castanon, William Karl

Proceedings Volume 3853, (1999) https://doi.org/10.1117/12.372869

KEYWORDS: Sensors, Land mines, General packet radio service, Electromagnetic coupling, Sensor fusion, Mining, Monte Carlo methods, Statistical modeling, Soil science, Statistical analysis

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Proceedings Article | 13 August 1999 Paper

Markov random field segmentation methods for SAR target chips

Robert Weisenseel, William Karl, David Castanon, Gregory Power, Phil Douville

Proceedings Volume 3721, (1999) https://doi.org/10.1117/12.357662

KEYWORDS: Image segmentation, Synthetic aperture radar, Target recognition, Target acquisition, Tin, Image processing, Statistical modeling, Data modeling, Automatic target recognition, Optimization (mathematics)

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Proceedings Article | 2 August 1999 Paper

Statistical fusion of GPR and EMI data

Robert Weisenseel, William Karl, David Castanon, Eric Miller, Carey Rappaport, Charles DiMarzio

Proceedings Volume 3710, (1999) https://doi.org/10.1117/12.356998

KEYWORDS: Sensors, Land mines, General packet radio service, Electromagnetic coupling, Mining, Sensor fusion, Signal detection, Monte Carlo methods, Statistical modeling, Statistical analysis

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Proceedings Article | 13 July 1999 Paper

Ultrasound tissue analysis and characterization

John Kaufhold, Ray Chan, William Karl, David Castanon

Proceedings Volume 3712, (1999) https://doi.org/10.1117/12.353013

KEYWORDS: Ultrasonography, Image processing, Tissues, Biomedical optics, Image segmentation, Image enhancement, Speckle, Medical imaging, Matrices, Image quality

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Proceedings Article | 10 February 1999 Paper

Statistical sensor fusion analysis of near-IR polarimetric and thermal imagery for the detection of minelike targets

Robert Weisenseel, William Karl, David Castanon, Charles DiMarzio

Proceedings Volume 3534, (1999) https://doi.org/10.1117/12.339013

KEYWORDS: Land mines, Polarization, Sensors, Mining, Target detection, Reflectivity, Polarimetry, Data modeling, Statistical analysis, Sensor fusion

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Proceedings Article | 4 September 1998 Paper

Statistical approach to multichannel spatial modeling for the detection of minelike targets

Robert Weisenseel, William Karl, David Castanon, Charles DiMarzio

Proceedings Volume 3392, (1998) https://doi.org/10.1117/12.324152

KEYWORDS: Land mines, Mining, Target detection, Polarization, Sensors, Statistical modeling, Statistical analysis, Data modeling, Detection and tracking algorithms, Thermography

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Proceedings Article | 4 September 1998 Paper

Detection of buried mines from array inductive measurements

Eric Miller, William Karl, Stephen Norton

Proceedings Volume 3392, (1998) https://doi.org/10.1117/12.324141

KEYWORDS: Mining, Land mines, Data modeling, Sensors, Filtering (signal processing), Electromagnetic coupling, Receivers, Electromagnetism, Scattering, Interference (communication)

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Proceedings Article | 11 October 1994 Paper

Wavelet-packet-based multiple-access communication

Rachel Learned, A. Hamid Krim, Bernhard Claus, Alan Willsky, William Karl

Proceedings Volume 2303, (1994) https://doi.org/10.1117/12.188775

KEYWORDS: Wavelets, Sensors, Receivers, Signal to noise ratio, Algorithm development, Telecommunications, Time-frequency analysis, Signal detection, Detection and tracking algorithms, Computing systems

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Proceedings Article | 30 June 1994 Paper

Statistical multiscale approach to mapping altimetric data

Paul Fieguth, William Karl, Alan Willsky

Proceedings Volume 2304, (1994) https://doi.org/10.1117/12.179217

KEYWORDS: Error analysis, Statistical analysis, Data modeling, Statistical modeling, Associative arrays, Oceanography, Data processing, Satellites, Process modeling, Atmospheric modeling

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Proceedings Article | 1 November 1993 Paper

Multiscale method for tomographic reconstruction

Mickey Bhatia, William Karl, Alan Willsky

Proceedings Volume 2034, (1993) https://doi.org/10.1117/12.162088

KEYWORDS: Reconstruction algorithms, Tomography, Data modeling, Wavelets, Stochastic processes, Wavelet transforms, Detection and tracking algorithms, Aluminum, Image quality, Point spread functions

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Proceedings Article | 29 July 1993 Paper

Dynamic estimation of left-ventricular ejection fraction

Seema Jaggi, William Karl, Alan Willsky

Proceedings Volume 1905, (1993) https://doi.org/10.1117/12.148635

KEYWORDS: 3D modeling, Data modeling, Heart, Matrices, Performance modeling, Computer simulations, Error analysis, Process modeling, Modeling, Image processing

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Proceedings Article | 8 April 1993 Paper

Square-root filtering in time-sequential estimation of random fields

Toshio Chin, William Karl, Arthur Mariano, Alan Willsky

Proceedings Volume 1903, (1993) https://doi.org/10.1117/12.143140

KEYWORDS: Filtering (signal processing), Image processing, Electronic filtering, Matrices, Image filtering, Video processing, Chemical elements, Digital filtering, Optimal filtering, Information operations

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Proceedings Article | 16 December 1992 Paper

Statistical approaches to the tomographic reconstruction of finitely parameterized geometric objects

Peyman Milanfar, William Karl, Alan Willsky

Proceedings Volume 1766, (1992) https://doi.org/10.1117/12.130884

KEYWORDS: Signal to noise ratio, Reconstruction algorithms, Binary data, Stochastic processes, Signal processing, Tomography, Image processing, Data modeling, Numerical analysis, Interference (communication)

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