Scientist

Institute for Infocomm Research (I2R)
A-STAR
Level 10 Connexis (North Tower)
Singapore 138632
E-mail: xux AT i2r.a-star.edu.sg Google Scholar GitHub LinkedIn

I am currently a scientist with the Institute for Infocomm Research (I2R), A-STAR. Prior to that, I was a Research Fellow working with Assist Prof. Lee Gim Hee in the Computer Vision and Robotic Perception (CVRP) Lab of School of Computing, Natinoal University of Singapore (NUS). I also worked with Prof. Cheong Loong Fah in Visual Interactive Media Lab of NUS from Sep 2016 to Mar 2019. I received a PhD degree from Computer Vision Group in the School of Electronic Engineering and Computer Science at Queen Mary, University of London (QMUL), jointly supervised by Prof. Shaogang Gong and Dr. Tao Xiang. I was also working closely with Dr. Timothy Hospedales .

Before joining the Computer Vision Group in QMUL I received my B.Eng in Automation from Sichuan University and then had spent 2 years in 3D Vision Lab at Sichuan University supervised by Prof. Yusheng Liu and Prof. Kai Liu.

My research interests include point cloud analysis, motion segmentation, zero-shot learning and surveillance scene understanding.

Feb 2023: One PhD full scholarship starting from Sep 2023 jointly supported by A*STAR and University of Coventry is available. Pleas find more details here.
Sep 2022: Our work on Revisiting Realistic Test-Time Training: Sequential Inference and Adaptation by Anchored Clustering was accepted by NeurIPS 2022. Congratulations to Su Yongyi!
Jun 2022: Our work on Open-Set Semi-Supervised Learning for 3D Point Cloud Understanding was accepted by ICPR 2022 as Oral presentation.
May 2022: Two works to appear in IEEE Transactions on Image Processing (TIP).
Nov 2021: Our work on Automatic Data Augmentation for 3D Point Cloud has appeared in BMVC 2021. Code is available here.

May 2021: A*STAR CDA Project "Exploiting Unlabeled Data, Cheaper Labels and Efficient Annotation for 3D Point Cloud Deep Learning" (EUDEA)

• My project on exploring label-efficient learning on 3D point cloud data started from Apr. 2021.
  
• We will be looking into improving the efficiency of 3D point cloud learning from several perspectives.
  

Education Background

• PhD in Computer Science, Queen Mary University of London, 2016
  Thesis: Semantic Spaces for Video Analysis of Behaviour
  Supervisors: Prof. Shaogang Gong and Dr. Tao Xiang
• M.Sc in Control Theory and Engineering, Sichuan University, 2012
  Supervisor: Prof. Yusheng Liu
• B.Eng in Automation, Sichuan University, 2010
  

Professional Experience

• Scientist with I2R, A-STAR, Singpaore
  2019.12-Now
  
• Research Fellow in SoC, National University of Singapore
  2019.4-2019.12
  Supervisors: Prof. Gim Hee Lee
• Research Fellow in ECE, National University of Singapore
  2016.9-2019.3
  Supervisors: Prof. Loong-Fah Cheong

Academic Services

Member

• IEEE Senior Member

Journal Reviewer

• International Journal of Computer Vision (IJCV)
• Transactions on Machine Learning Research (TMLR)
• IEEE Transactions on Image Processing (TIP)
• IEEE Transactions on Neural Networks and Learning Systems (TNNLS)
• ACM Transactions on Knowledge Discovery from Data (TKDD)
• IEEE Transactions on Circuits and Systems for Video Technology (TCSVT)

Conference Reviewer

• ICLR
• NeurIPS
• ICML
• CVPR
• ECCV
• ICCV

Diverse and consistent multi-view networks for semi-supervised regression PDF
Cuong Nguyen, Arun Raja, Le Zhang, Xun Xu, Balagopal Unnikrishnan, Mohamed Ragab, Kangkang Lu and Chuan-Sheng Foo
Machine Learning (ML), 2023

On Adversarial Robustness of Audio Classifiers PDF
Kangkang Lu, Manh Cuong Nguyen, Xun Xu and Chuan Sheng Foo International Conference on Acoustics, Speech, & Signal Processing (ICASSP 2023)

Revisiting Realistic Test-Time Training: Sequential Inference and Adaptation by Anchored Clustering PDF ProjectPage
Yongyi Su, Xun Xu and Kui Jia
Advances in Neural Information Processing Systems (NeurIPS 2022)

SemiCurv: Semi-Supervised Curvilinear Structure Segmentation PDF ProjectPage Bibtex
Xun Xu, Manh Cuong Nguyen, Yasin Yazici, Kangkang Lu, Hlaing Min, Chuan Sheng Foo
IEEE Transactions on Image Processing (TIP), 2022

MA-GANet: A Multi-Attention Generative Adversarial Network for Defocus Blur Detection PDF Bibtex
Zeyu Jiang, Xun Xu, Le Zhang, Chao Zhang, Chuan Sheng Foo and Ce Zhu
IEEE Transactions on Image Processing (TIP), 2022

Open-Set Semi-Supervised Learning for 3D Point Cloud Understanding PDF Bibtex
Xian Shi, Xun Xu, Wanyue Zhang, Xiatian Zhu, Chuan Sheng Foo and Kui Jia
International Conference on Pattern Recognition (ICPR 2022) (Oral Presentation)

On Representation Knowledge Distillation for Graph Neural Networks PDF ProjectPage Bibtex
Chaitanya K. Joshi, Fayao Liu, Xun Xu, Jie Lin and Chuan Sheng Foo
IEEE Transactions on Neural Networks and Learning Systems (TNNLS), 2022

Revisiting Pretraining for Semi-Supervised Learning in the Low-Label Regime PDF
Xun Xu, Jingyi Liao, Lile Cai, Manh Cuong Nguyen, Kangkang Lu, Wanyue Zhang, Yasin Yazici and Chuan Sheng Foo
Preprint, 2022

Weakly Supervised 3D Point Cloud Segmentation via Multi-Prototype Learning PDF
Yongyi Su, Xun Xu and Kui Jia
Preprint, 2022

Exploring Diversity-based Active Learning for 3D Object Detection in Autonomous Driving PDF
Zhihao Liang, Xun Xu, Shengheng Deng, Lile Cai, Tao Jiang and Kui Jia
Preprint, 2022

Learning Clustering for Motion Segmentation PDF ProjectPage Bibtex
Xun Xu, Loong-Fah Cheong, Zhuwen Li, Le Zhang and Ce Zhu
IEEE Transactions on Circuits and Systems for Video Technology (TCSVT), 2021

3D AffordanceNet: A Benchmark for Visual Object Affordance Understanding PDF ProjectPage Bibtex
Shengheng Deng Xun Xu, Chaozheng Wu, Ke Chen and Kui Jia
IEEE Conference on Computer Vision and Pattern Recognition (CVPR 2021)

Revisiting Superpixels for Active Learning in Semantic Segmentation with Realistic Annotation Costs PDF Supplementary ProjectPage Bibtex
Lile Cai, Xun Xu, Junhao Lieuw and Chuan Sheng Foo
IEEE Conference on Computer Vision and Pattern Recognition (CVPR 2021)

ARMOURED: Adversarially Robust MOdels using Unlabeled data by REgularizing Diversity PDF Bibtex
Kangkang Lu, Cuong M Nguyen, Xun Xu, Kiran Chari, Yu Jing Goh and Chuan Sheng Foo
International Conference on Learning Representations (ICLR 2021)

Exploring Spatial Diversity for Region-based Active Learning PDF Bibtex
Lile Cai, Xun Xu, Lining Zhang and Chuan Sheng Foo
IEEE Transactions on Image Processing (TIP), 2021

On Automatic Data Augmentation for 3DPoint Cloud Classification PDF ProjectPage Bibtex
Wanyue Zhang, Xun Xu, Fayao Liu, Le Zhang and Chuan Sheng Foo
British Machine Vision Conference (BMVC 2021)

Label-Efficient Point Cloud Semantic Segmentation: An Active Learning Approach PDF
Xian Shi, Xun Xu, Ke Chen, Lile Cai, Chuan Sheng Foo and Kui Jia
Preprint, 2021

Learning Category-level Shape Saliency via Deep Implicit Surface Networks PDF
Chaozheng Wu, Sun Lin, Xun Xu and Kui Jia
Preprint, 2021

MultiANet: a Multi-Attention Network for DefocusBlur Detection PDF ProjectPage Bibtex
Zeyu Jiang, Xun Xu, Chao Zhang, Xiaoning Liu and Ce Zhu
IEEE International Workshop on Multimedia Signal Processing (MMSP 2020)

Weakly Supervised Semantic Point Cloud Segmentation: Towards 10× Fewer Labels PDF ProjectPage Bibtex
Xun Xu and Gim Hee Lee
IEEE Conference on Computer Vision and Pattern Recognition (CVPR 2020)

3D Rigid Motion Segmentation with Mixed and Unknown Number of Models PDF ProjectPage Bibtex
Xun Xu， Loong-Fah Cheong and Zhuwen Li
IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI), 2019

C3AE: Exploring the Limits of Compact Model for Age Estimation PDF
Chao Zhang, Shuaicheng Liu, Xun Xu and Ce Zhu
IEEE Conference on Computer Vision and Pattern Recognition (CVPR 2019)

Motion Segmentation by Exploiting Complementary Geometric Models PDF ProjectPage Bibtex
Xun Xu, Loong-Fah Cheong and Zhuwen Li
IEEE Conference on Computer Vision and Pattern Recognition (CVPR 2018)

Robust Video Background Identification by Dominant Rigid Motion Estimation PDF Bibtex
Kaimo Lin, Nianjuan Jiang, Loong Fah Cheong, Jiangbo Lu and Xun Xu
Asian Conference on Computer Vision (ACCV 2018)

Image Ordinal Classification and Understanding: Grid Dropout with Mask Label PDF Bibtex [Oral Presentation]
Chao Zhang, Ce Zhu, Jimin Xiao, Xun Xu and Yipeng Liu
IEEE Conference on Multimedia and Expo (ICME 2018)

Visual aesthetic understanding: Sample-specific aesthetic classification and deep activation map visualization PDF Bibtex
Chao Zhang, Ce Zhu, Xun Xu, Yipeng Liu, Jimin Xiao and Tammam Tillo
Signal Processing: Image Communication (SPIG), 2018

Image ordinal classification with deep multi-view learning PDF Bibtex
Chao Zhang, Xun Xu and Ce Zhu
Electronic Letters, 2018

Transductive Zero-Shot Action Recognition by Word-Vector Embedding PDF Data Bibtex
Xun Xu, Timothy Hospedales and Shaogang Gong
International Journal of Computer Vision (IJCV), 2017

Discovery of Shared Semantic Spaces for Multi-Scene Video Query and Summarization PDF Supplementary Slides Project Page Bibtex
Xun Xu, Timothy Hospedales and Shaogang Gong
IEEE Transactions on Circuits and Systems for Video Technology (TCSVT), 2017

Zero-Shot Crowd Behaviour Recognition PDF
Xun Xu, Shaogang Gong and Timothy Hospedales
In Murino, Shah, Cristani, Savarese (Eds.), Group and Crowd Behaviour Understanding in Computer Vision , Elsevier, April 2017.

Multi-Task Zero-Shot Action Recognition with Prioritised Data Augmentation PDF Data Bibtex
Xun Xu, Timothy Hospedales and Shaogang Gong
European Conference on Computer Vision (ECCV 2016)

Semantic Embedding Space for Zero ­Shot Action Recognition PDF Slides Demo Bibtex [★ recognized as top 10% papers]
Xun Xu, Timothy Hospedales and Shaogang Gong
International Conference on Image Processing (ICIP 2015)

Cross-Domain Traffic Scene Understanding by Motion Model Transfer PDF Code Bibtex
Xun Xu, Shaogang Gong and Timothy Hospedales
ACM International Conference on Multimedia, Workshop on Analysis and Retrieval of Tracked Events and Motion in Imagery Streams, 2013