Dr. James G. Nagy Profile

Dr. James G. Nagy

at Emory Univ

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Author

Publications (15)

Proceedings Article | 18 October 2022 Open Access

Effect of attenuation model on iodine quantification in contrast-enhanced breast CT

Mikhail Mikerov, Koen Michielsen, James Nagy, Ioannis Sechopoulos

Proceedings Volume 12304, 123042T (2022) https://doi.org/10.1117/12.2646452

KEYWORDS: Iodine, Breast, X-ray computed tomography

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Proceedings Article | 6 July 2018 Paper

Dose reduction in breast CT by spectrum switching

Koen Michielsen, Christian Fedon, James Nagy, Ioannis Sechopoulos

Proceedings Volume 10718, 107180J (2018) https://doi.org/10.1117/12.2318425

KEYWORDS: Breast, Reconstruction algorithms, Monte Carlo methods, Switching, Copper, X-ray computed tomography, Computed tomography, Image quality

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Proceedings Article | 25 October 2013 Paper

High-resolution imaging through strong atmospheric turbulence

Stuart Jefferies, Douglas Hope, Michael Hart, James Nagy

Proceedings Volume 8890, 88901C (2013) https://doi.org/10.1117/12.2028193

KEYWORDS: Turbulence, Wavefronts, Atmospheric modeling, Atmospheric turbulence, Point spread functions, Image processing, Adaptive optics, Imaging systems, Spatial frequencies, Telescopes

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Proceedings Article | 25 August 2006 Paper

High-resolution iris image reconstruction from low-resolution imagery

R. Barnard, V. Pauca, T. Torgersen, R. Plemmons, S. Prasad, J. van der Gracht, J. Nagy, J. Chung, G. Behrmann, S. Mathews, M. Mirotznik

Proceedings Volume 6313, 63130D (2006) https://doi.org/10.1117/12.681930

KEYWORDS: Cameras, Iris recognition, Image resolution, Sensors, Image registration, Image quality, Imaging systems, Prototyping, Charge-coupled devices, Point spread functions

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Proceedings Article | 26 October 2004 Paper

Quasi-Newton methods for image restoration

James Nagy, Katrina Palmer

Proceedings Volume 5559, (2004) https://doi.org/10.1117/12.561060

KEYWORDS: Image restoration, Iterative methods, Signal processing, Filtering (signal processing)

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Proceedings Article | 24 December 2003 Paper

Anti-reflective boundary conditions and fast 2D deblurring models

Marco Donatelli, Claudio Estatico, James Nagy, Lisa Perrone, Stefano Serra-Capizzano

Proceedings Volume 5205, (2003) https://doi.org/10.1117/12.503944

KEYWORDS: Reflectivity, Point spread functions, Matrices, Image processing, Image restoration, Convolution, Chemical elements, Computing systems, Mathematical modeling, Numerical simulations

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Proceedings Article | 24 December 2003 Paper

Kronecker products in image restoration

James Nagy, Lisa Perrone

Proceedings Volume 5205, (2003) https://doi.org/10.1117/12.512082

KEYWORDS: Point spread functions, Image restoration, Iterative methods, Matrices, Image filtering, Fourier transforms, MATLAB, Interference (communication), Optical filters, Filtering (signal processing)

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Proceedings Article | 4 October 2000 Paper

Enforcing nonnegativity in image reconstruction algorithms

James Nagy, Zdenek Strakos

Proceedings Volume 4121, (2000) https://doi.org/10.1117/12.402439

KEYWORDS: Expectation maximization algorithms, Image restoration, Iterative methods, Reconstruction algorithms, Point spread functions, Data modeling, Positron emission tomography, Chemical elements, Algorithm development, Computer science

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Proceedings Article | 2 October 1998 Paper

Kronecker product and SVD approximations for separable spatially variant blurs

Julie Kamm, James Nagy

Proceedings Volume 3461, (1998) https://doi.org/10.1117/12.325696

KEYWORDS: Point spread functions, Image restoration, Matrices, Image processing, Hubble Space Telescope, Fourier transforms, Berkelium, Medical imaging, Mathematical modeling, Data modeling

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Proceedings Article | 24 October 1997 Paper

Fast iterative image restoration with a spatially varying PSF

James Nagy, Dianne O'Leary

Proceedings Volume 3162, (1997) https://doi.org/10.1117/12.279513

KEYWORDS: Point spread functions, Image restoration, Convolution, Image processing, Matrices, Signal to noise ratio, Medical imaging, Image quality, Image storage, Imaging arrays

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Proceedings Article | 28 October 1994 Paper

Fast restoration of atmospherically blurred images

James Nagy, Robert Plemmons, Todd Torgersen

Proceedings Volume 2296, (1994) https://doi.org/10.1117/12.190866

KEYWORDS: Deconvolution, Stars, Convolution, Iterative methods, Imaging systems, Atmospheric turbulence, Matrices, Point spread functions, Algorithms, Image filtering

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Proceedings Article | 28 October 1994 Paper

Fast algorithms for the regularization of banded Toeplitz least squares problems

James Nagy

Proceedings Volume 2296, (1994) https://doi.org/10.1117/12.190868

KEYWORDS: Matrices, Tolerancing, Computing systems, Condition numbers, Algorithms, Signal processing, Image processing, Radon, Fourier transforms, Mathematics

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Proceedings Article | 1 February 1994 Paper

Image restoration using fast Fourier and wavelet transforms

William Harrod, James Nagy, Robert Plemmons

Proceedings Volume 2093, (1994) https://doi.org/10.1117/12.172516

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Proceedings Article | 30 November 1992 Paper

Block circulant preconditioners for 2D deconvolution

Raymond Chan, James Nagy, Robert Plemmons

Proceedings Volume 1770, (1992) https://doi.org/10.1117/12.130917

KEYWORDS: Image restoration, Matrices, Deconvolution, Fourier transforms, Radon, Point spread functions, Image processing, Information operations, Mathematics, Iterative methods

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Proceedings Article | 1 December 1991 Paper

Some fast Toeplitz least-squares algorithms

James Nagy, Robert Plemmons

Proceedings Volume 1566, (1991) https://doi.org/10.1117/12.49810

KEYWORDS: Matrices, Signal processing, Fourier transforms, Radon, Algorithms, Mathematics, Iterative methods, Chlorine, Computer science, Image processing

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Showing 5 of 15 publications

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