Search Results for author: James Nagy

Found 5 papers, 2 papers with code

Ambiguity in solving imaging inverse problems with deep learning based operators

no code implementations31 May 2023 Davide Evangelista, Elena Morotti, Elena Loli Piccolomini, James Nagy

Numerical experiments are performed to verify the accuracy and stability of the proposed approaches for image deblurring when unknown or not-quantified noise is present; the results confirm that they improve the network stability with respect to noise.

Deblurring Image Deblurring

To be or not to be stable, that is the question: understanding neural networks for inverse problems

2 code implementations24 Nov 2022 Davide Evangelista, James Nagy, Elena Morotti, Elena Loli Piccolomini

The solution of linear inverse problems arising, for example, in signal and image processing is a challenging problem since the ill-conditioning amplifies, in the solution, the noise present in the data.

Deblurring Image Deblurring

Minimizing L1 over L2 norms on the gradient

no code implementations4 Jan 2021 Chao Wang, Min Tao, Chen-Nee Chuah, James Nagy, Yifei Lou

Consequently, we postulate that applying L1/L2 on the gradient is better than the classic total variation (the L1 norm on the gradient) to enforce the sparsity of the image gradient.

Limited-angle CT reconstruction via the L1/L2 minimization

no code implementations31 May 2020 Chao Wang, Min Tao, James Nagy, Yifei Lou

In this paper, we consider minimizing the L1/L2 term on the gradient for a limited-angle scanning problem in computed tomography (CT) reconstruction.

Computed Tomography (CT)

LAP: a Linearize and Project Method for Solving Inverse Problems with Coupled Variables

1 code implementation28 May 2017 James Herring, James Nagy, Lars Ruthotto

LAP is most promising for cases when the subproblem corresponding to one of the variables is considerably easier to solve than the other.

Image Super-Resolution

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