Liya Ji
Liya Ji is a Postdoctoral Fellow at the Hong Kong University of Science and Technology (HKUST), supervised by Prof. Qifeng Chen.
Liya Ji obtained a Ph.D degree from HKUST, supervised by Prof. Qifeng Chen and
Prof. Qiang Yang . Liya Ji served as Manager, Machine Learning at Lenovo Group Limited from 2018 to 2021. Liya Ji obtained
Master of Philosophy at the Department of Computer Science and Engineering from HKUST in 2015 and received her Bachelor of Engineering
at the Department of Computer Science and Technology from Xi'an Jiaotong University in 2012. Her research interests include generative models, low-level vision, computational aesthetics, and unified multi-modal generation.
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Scholar
Education/Experiences
2025/01-Now: Postdoctoral Fellow (ITF), supervisor: Prof. Qifeng Chen , in Computer Science and Engineering, HKUST, Hong Kong
2024/11-2024/12: Research Assistant in Computer Science and Engineering, HKUST, Hong Kong
2023/06-2024/08: Research Intern, mentor: Dr. Xiaodong Cun and Dr. Xintao Wang , in Computer Vision, Tencent AI Lab, Shen Zhen
2021/08-2024/10: Ph.D , supervisors: Prof. Qifeng Chen and Prof. Qiang Yang , in EMIA (ROAS), HKUST, Hong Kong
2018/11-2021/06: Manager (Computer Vision) in Machine Intelligence, Lenovo Group Limited, Hong Kong
2017/1-2018/10: Staff Researcher in Machine Intelligence, Lenovo Group Limited, Hong Kong
2015/8-2016/12: Researcher in Machine Intelligence, Lenovo Group Limited, Hong Kong
2012/8-2015/7: MPhil , supervisor: Prof. Qiang Yang , in Computer Science and Engineering, HKUST, Hong Kong
2008/9-2012/7: B.E. in Computer Science and Technology, Xi'an Jiaotong University, Xi'an
2011/2-2011/7: Visiting Student at National Taiwan University, Taipei
Publications
(* indicates the equal contributions. + indicates the corresponding authors.)
Zero-shot Synthetic Video Realism Enhancement via Structure-aware Denoising
Yifan Wang*,
Liya Ji* ,
Zhanghan Ke, Harry Yang, Ser-Nam Lim, Qifeng Chen+
Preprint , 2025
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paper
We enhance the realism of the synthetic videos from the simulator CARLA via using the World Foundation Model.
Instruction-based Image Editing with Planning, Reasoning, and Generation
Liya Ji ,
Chenyang Qi, Qifeng Chen+
ICCV , 2025
paper
We address the instruction-based image editing with Chain-of-Thought MLLMs reasoning, and diffusion generation
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ModelGrow: Continual Text-to-Video Pre-training with Model Expansion and Language Understanding Enhancement
Zhefan Rao*,
Liya Ji* ,
Yazhou Xing, Runtao Liu, Zhaoyang Liu, Jiaxin Xie, Ziqiao Peng, Yingqing He+, Qifeng Chen+
Preprint , 2024
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paper
We continually train a pre-trained T2V models via block expansion and LLMs conditioning.
A Diffusion Model with State Estimation for Degradation-Blind Inverse Imaging
Liya Ji* ,
Zhefan Rao*, Sinno Jialin Pan, Chenyang Lei+, Qifeng Chen+
AAAI , 2024
paper
We propose a pixel-wise control framework based on unconditional diffusion models for the degradation-blind inverse problems with the performance of semantic consistency and details preservation.
Neural Image Popularity Assessment with Retrieval-augmented Transformer
Liya Ji* ,
Chan Ho Park*, Zhefan Rao*, Qifeng Chen+
ACM MultiMedia , 2023
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paper
We propose an image assessment metric presenting human's like based on Instagram dataset.
LeapDetect: An Agile Platform for Inspecting Power Transmission Lines from Drones
Guangcan Mai, Renjie Gou,
Liya Ji ,
Hua Wu, Fei Cao, Qifeng Chen, Jun Luo+
ICDM Workshop , 2019
paper
We propose an automatic framework enabling agile development of detection models and human-in-the-loop annoation.
Academic Services & Awards
Program Reviewers: ACM Multimedia 2024, CVPR 2025, Transaction on Image Processing(TIP)
Postgraduate Studentship (HKUST) in 2021-2024
Team Excellence, FY2017/2018 Lenovo Corporate Award in 2018
Excellent Graduate in Xi'an Jiaotong University in 2012