Xia Li

About the PI

I am a tenure-track Associate Professor and Ph.D. supervisor at the School of Biomedical Engineering, Shanghai Jiao Tong University, where I lead the MedAPT group: Medical AI for Precision Therapy.

My research lies at the intersection of machine learning, computer vision, medical imaging, and radiation oncology. I am particularly interested in developing advanced imaging algorithms for image-guided precision radiotherapy, with a focus on proton therapy. Our group works on accelerating and improving core medical imaging methods, including image reconstruction, synthesis, registration, segmentation, uncertainty estimation, and dose-related modeling, with the goal of making precision cancer treatment faster, more accurate, and more accessible.

Quasi-dense similarity learning for multiple object tracking
Quasi-dense similarity learning for multiple object tracking

We present Quasi-Dense Similarity Learning, which densely samples hundreds of region proposals on a pair of images for contrastive learning.

Feb 20, 2021
PointFlow: Flowing Semantics Through Points for Aerial Image Segmentation
PointFlow: Flowing Semantics Through Points for Aerial Image Segmentation

Feb 13, 2021
Bi-directional Exponential Angular Triplet Loss for RGB-Infrared Person Re-Identification
Bi-directional Exponential Angular Triplet Loss for RGB-Infrared Person Re-Identification

We propose a novel ranking loss function, named Bi-directional Exponential Angular Triplet Loss, to help learn an angularly separable common feature space by explicitly constraining the included angles between embedding vectors.

Dec 12, 2020
Is Attention Better Than Matrix Decomposition?
Is Attention Better Than Matrix Decomposition?

Self-attention is not better than the matrix decomposition~(MD) model developed 20 years ago regarding the performance and computational cost for encoding the long-distance dependencies.

Sep 28, 2020
Improving Semantic Segmentation via Decoupled Body and Edge Supervision
Improving Semantic Segmentation via Decoupled Body and Edge Supervision

Jul 3, 2020
Position Constraint Loss For Fashion Landmark Estimation
Position Constraint Loss For Fashion Landmark Estimation

A Position Constraint Loss (PCLoss) method for fashion landmark estimation that constrains error landmark locations by utilizing position relationships, applicable to both regression and heatmap-based methods without modifying network structure.

May 4, 2020
Spatial Pyramid Based Graph Reasoning for Semantic Segmentation
Spatial Pyramid Based Graph Reasoning for Semantic Segmentation

Feb 24, 2020
SOGNet: Scene Overlap Graph Network for Panoptic Segmentation
SOGNet: Scene Overlap Graph Network for Panoptic Segmentation

We leverage each object’s category, geometry and appearance features to perform relational embedding, and output a relation matrix that encodes overlap relations. In order to overcome the lack of supervision, we introduce a differentiable module to resolve the overlap between any pair of instances.

Feb 7, 2020
Dynamic System Inspired Adaptive Time Stepping Controller for Residual Networks Families
Dynamic System Inspired Adaptive Time Stepping Controller for Residual Networks Families

We analyze the effects of time stepping on the Euler method and ResNets. We establish a stability condition for ResNets with step sizes and weight parameters, and point out the effects of step sizes on the stability and performance. Inspired by our analyses, we develop an adaptive time stepping controller that is dependent on the parameters of the current step, and aware of previous steps.

Feb 7, 2020
ICCV 2019 Oral
ICCV 2019 Oral

Oral presentation for EMANet

Nov 1, 2019
Self-Refining Deep Symmetry Enhanced Network for Rain Removal
Self-Refining Deep Symmetry Enhanced Network for Rain Removal

A Self-Refining Deep Symmetry Enhanced Network (DSEN) for rain removal that extracts rotation equivariant features and uses a self-refining mechanism to remove accumulated rain streaks in a coarse-to-fine manner.

Sep 22, 2019
Expectation Maximization Attention Networks for Semantic Segmentation
Expectation Maximization Attention Networks for Semantic Segmentation

We formulate the attention mechanism into an expectation-maximization manner and iteratively estimate a much more compact set of bases upon which the attention maps are computed.

Jul 22, 2019
R^2 Net Recurrent and Recursive Network for Sparse View CT Artifacts Removal
R^2 Net Recurrent and Recursive Network for Sparse View CT Artifacts Removal

We propose a novel neural network architecture to reduce streak artifacts generated in sparse-view 2D Cone Beam Computed To-mography (CBCT) image reconstruction.

Jun 19, 2019
Multi-label classification of PCB defects based on convolutional neural network
Multi-label classification of PCB defects based on convolutional neural network

A multi-label classification method based on Convolutional Neural Network for PCB defect detection that can simultaneously identify multiple defect types, improving detection accuracy and efficiency.

Oct 22, 2018
Recurrent Squeeze-and-Excitation Net for Single Image Deraining
Recurrent Squeeze-and-Excitation Net for Single Image Deraining

We propose a novel deep network architecture based on deep convolutional and recurrent neural networksfor single image deraining.

Jul 19, 2018