Search Results for author: Xiaojian Xu

Found 11 papers, 3 papers with code

CoRRECT: A Deep Unfolding Framework for Motion-Corrected Quantitative R2* Mapping

no code implementations12 Oct 2022 Xiaojian Xu, Weijie Gan, Satya V. V. N. Kothapalli, Dmitriy A. Yablonskiy, Ulugbek S. Kamilov

Quantitative MRI (qMRI) refers to a class of MRI methods for quantifying the spatial distribution of biological tissue parameters.

Self-Supervised Learning

Online Deep Equilibrium Learning for Regularization by Denoising

1 code implementation25 May 2022 Jiaming Liu, Xiaojian Xu, Weijie Gan, Shirin Shoushtari, Ulugbek S. Kamilov

However, the dependence of the computational/memory complexity of the measurement models in PnP/RED on the total number of measurements leaves DEQ impractical for many imaging applications.

Denoising

Monotonically Convergent Regularization by Denoising

no code implementations10 Feb 2022 Yuyang Hu, Jiaming Liu, Xiaojian Xu, Ulugbek S. Kamilov

Regularization by denoising (RED) is a widely-used framework for solving inverse problems by leveraging image denoisers as image priors.

Compressive Sensing Deblurring +2

Bregman Plug-and-Play Priors

no code implementations4 Feb 2022 Abdullah H. Al-Shabili, Xiaojian Xu, Ivan Selesnick, Ulugbek S. Kamilov

Our new Bregman Proximal Gradient Method variant of PnP (PnP-BPGM) and Bregman Steepest Descent variant of RED (RED-BSD) replace the traditional updates in PnP and RED from the quadratic norms to more general Bregman distance.

Denoising

Learning-based Motion Artifact Removal Networks (LEARN) for Quantitative $R_2^\ast$ Mapping

1 code implementation3 Sep 2021 Xiaojian Xu, Satya V. V. N. Kothapalli, Jiaming Liu, Sayan Kahali, Weijie Gan, Dmitriy A. Yablonskiy, Ulugbek S. Kamilov

LEARN-IMG performs motion correction on mGRE images and relies on the subsequent analysis for the estimation of $R_2^\ast$ maps, while LEARN-BIO directly performs motion- and $B0$-inhomogeneity-corrected $R_2^\ast$ estimation.

SGD-Net: Efficient Model-Based Deep Learning with Theoretical Guarantees

1 code implementation22 Jan 2021 Jiaming Liu, Yu Sun, Weijie Gan, Xiaojian Xu, Brendt Wohlberg, Ulugbek S. Kamilov

Deep unfolding networks have recently gained popularity in the context of solving imaging inverse problems.

Scalable Plug-and-Play ADMM with Convergence Guarantees

no code implementations5 Jun 2020 Yu Sun, Zihui Wu, Xiaojian Xu, Brendt Wohlberg, Ulugbek S. Kamilov

Plug-and-play priors (PnP) is a broadly applicable methodology for solving inverse problems by exploiting statistical priors specified as denoisers.

Provable Convergence of Plug-and-Play Priors with MMSE denoisers

no code implementations15 May 2020 Xiaojian Xu, Yu Sun, Jiaming Liu, Brendt Wohlberg, Ulugbek S. Kamilov

Plug-and-play priors (PnP) is a methodology for regularized image reconstruction that specifies the prior through an image denoiser.

Compressive Sensing Image Reconstruction

Image Restoration using Total Variation Regularized Deep Image Prior

no code implementations30 Oct 2018 Jiaming Liu, Yu Sun, Xiaojian Xu, Ulugbek S. Kamilov

In the past decade, sparsity-driven regularization has led to significant improvements in image reconstruction.

Deblurring Image Denoising +2

signProx: One-Bit Proximal Algorithm for Nonconvex Stochastic Optimization

no code implementations20 Jul 2018 Xiaojian Xu, Ulugbek S. Kamilov

Stochastic gradient descent (SGD) is one of the most widely used optimization methods for parallel and distributed processing of large datasets.

Stochastic Optimization

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