Search Results for author: Yifei Lou

Found 11 papers, 5 papers with code

Improvements on Uncertainty Quantification for Node Classification via Distance-Based Regularization

1 code implementation10 Nov 2023 Russell Alan Hart, Linlin Yu, Yifei Lou, Feng Chen

A large number of literature relies on uncertainty quantification to evaluate the reliability of a learning model, which is particularly important for applications of out-of-distribution (OOD) detection and misclassification detection.

Node Classification Out of Distribution (OOD) Detection +1

Weighted Anisotropic-Isotropic Total Variation for Poisson Denoising

1 code implementation1 Jul 2023 Kevin Bui, Yifei Lou, Fredrick Park, Jack Xin

Poisson noise commonly occurs in images captured by photon-limited imaging systems such as in astronomy and medicine.

Astronomy Computational Efficiency +1

A Lifted $\ell_1 $ Framework for Sparse Recovery

no code implementations10 Mar 2022 Yaghoub Rahimi, Sung Ha Kang, Yifei Lou

Motivated by re-weighted $\ell_1$ approaches for sparse recovery, we propose a lifted $\ell_1$ (LL1) regularization which is a generalized form of several popular regularizations in the literature.

An Efficient Smoothing and Thresholding Image Segmentation Framework with Weighted Anisotropic-Isotropic Total Variation

1 code implementation21 Feb 2022 Kevin Bui, Yifei Lou, Fredrick Park, Jack Xin

In this paper, we design an efficient, multi-stage image segmentation framework that incorporates a weighted difference of anisotropic and isotropic total variation (AITV).

Image Segmentation Segmentation +1

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)

A Weighted Difference of Anisotropic and Isotropic Total Variation for Relaxed Mumford-Shah Color and Multiphase Image Segmentation

1 code implementation9 May 2020 Kevin Bui, Fredrick Park, Yifei Lou, Jack Xin

In a class of piecewise-constant image segmentation models, we propose to incorporate a weighted difference of anisotropic and isotropic total variation (AITV) to regularize the partition boundaries in an image.

Denoising Image Segmentation +2

Probabilistic Structure Learning for EEG/MEG Source Imaging with Hierarchical Graph Prior

no code implementations5 Jun 2019 Feng Liu, Li Wang, Yifei Lou, Ren-cang Li, Patrick Purdon

Traditional EEG/MEG Source Imaging (ESI) methods usually assume that either source activity at different time points is unrelated, or that similar spatiotemporal patterns exist across an entire study period.

EEG

A Scale Invariant Approach for Sparse Signal Recovery

no code implementations20 Dec 2018 Yaghoub Rahimi, Chao Wang, Hongbo Dong, Yifei Lou

In this paper, we study the ratio of the $L_1 $ and $L_2 $ norms, denoted as $L_1/L_2$, to promote sparsity.

MRI Reconstruction

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