Search Results for author: Yongjian Hu

Found 12 papers, 5 papers with code

Deep Learning Techniques for Video Instance Segmentation: A Survey

no code implementations19 Oct 2023 Chenhao Xu, Chang-Tsun Li, Yongjian Hu, Chee Peng Lim, Douglas Creighton

Video instance segmentation, also known as multi-object tracking and segmentation, is an emerging computer vision research area introduced in 2019, aiming at detecting, segmenting, and tracking instances in videos simultaneously.

Action Recognition Instance Segmentation +6

Hyperbolic Face Anti-Spoofing

no code implementations17 Aug 2023 Shuangpeng Han, Rizhao Cai, Yawen Cui, Zitong Yu, Yongjian Hu, Alex Kot

To further improve generalization, we conduct hyperbolic contrastive learning for the bonafide only while relaxing the constraints on diverse spoofing attacks.

Contrastive Learning Face Anti-Spoofing +1

Self-Supervised 3D Action Representation Learning with Skeleton Cloud Colorization

no code implementations18 Apr 2023 Siyuan Yang, Jun Liu, Shijian Lu, Er Meng Hwa, Yongjian Hu, Alex C. Kot

We investigate self-supervised representation learning and design a novel skeleton cloud colorization technique that is capable of learning spatial and temporal skeleton representations from unlabeled skeleton sequence data.

Colorization Representation Learning +2

Rehearsal-Free Domain Continual Face Anti-Spoofing: Generalize More and Forget Less

no code implementations ICCV 2023 Rizhao Cai, Yawen Cui, Zhi Li, Zitong Yu, Haoliang Li, Yongjian Hu, Alex Kot

To alleviate the forgetting of previous domains without using previous data, we propose the Proxy Prototype Contrastive Regularization (PPCR) to constrain the continual learning with previous domain knowledge from the proxy prototypes.

Continual Learning Domain Generalization +1

Rethinking Vision Transformer and Masked Autoencoder in Multimodal Face Anti-Spoofing

no code implementations11 Feb 2023 Zitong Yu, Rizhao Cai, Yawen Cui, Xin Liu, Yongjian Hu, Alex Kot

In this paper, we investigate three key factors (i. e., inputs, pre-training, and finetuning) in ViT for multimodal FAS with RGB, Infrared (IR), and Depth.

Face Anti-Spoofing

One-Class Knowledge Distillation for Face Presentation Attack Detection

1 code implementation8 May 2022 Zhi Li, Rizhao Cai, Haoliang Li, Kwok-Yan Lam, Yongjian Hu, Alex C. Kot

Under this framework, a teacher network is trained with source domain samples to provide discriminative feature representations for face PAD.

Face Presentation Attack Detection

Asymmetric Modality Translation For Face Presentation Attack Detection

no code implementations18 Oct 2021 Zhi Li, Haoliang Li, Xin Luo, Yongjian Hu, Kwok-Yan Lam, Alex C. Kot

In this paper, we propose a novel framework based on asymmetric modality translation for face presentation attack detection in bi-modality scenarios.

Face Presentation Attack Detection Face Recognition +1

Learning Meta Pattern for Face Anti-Spoofing

1 code implementation13 Oct 2021 Rizhao Cai, Zhi Li, Renjie Wan, Haoliang Li, Yongjian Hu, Alex ChiChung Kot

To improve the generalization ability, recent hybrid methods have been explored to extract task-aware handcrafted features (e. g., Local Binary Pattern) as discriminative information for the input of DNNs.

Domain Generalization Face Anti-Spoofing +1

Variational Representation Learning for Vehicle Re-Identification

1 code implementation7 May 2019 Saghir Ahmed Saghir Alfasly, Yongjian Hu, Tiancai Liang, Xiaofeng Jin, Qingli Zhao, Beibei Liu

One of the most challenging problems is to learn an efficient representation for a vehicle from its multi-viewpoint images.

Representation Learning Retrieval +1

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