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Zero-shot skeleton-based action recognition aims to recognize actions of unseen categories after training on data of seen categories. The key is to build the connection between visual and semantic space from seen to unseen classes. Previous…

Computer Vision and Pattern Recognition · Computer Science 2023-10-31 Yujie Zhou , Wenwen Qiang , Anyi Rao , Ning Lin , Bing Su , Jiaqi Wang

Zero-shot skeleton-based action recognition aims to classify unseen skeleton-based human actions without prior exposure to such categories during training. This task is extremely challenging due to the difficulty in generalizing from known…

Computer Vision and Pattern Recognition · Computer Science 2025-07-25 Kai Zhou , Shuhai Zhang , Zeng You , Jinwu Hu , Mingkui Tan , Fei Liu

Zero-shot human skeleton-based action recognition aims to construct a model that can recognize actions outside the categories seen during training. Previous research has focused on aligning sequences' visual and semantic spatial…

Computer Vision and Pattern Recognition · Computer Science 2024-06-04 Haojun Xu , Yan Gao , Jie Li , Xinbo Gao

We present a cross-modal Transformer-based framework, which jointly encodes video data and text labels for zero-shot action recognition (ZSAR). Our model employs a conceptually new pipeline by which visual representations are learned in…

Computer Vision and Pattern Recognition · Computer Science 2022-05-04 Chung-Ching Lin , Kevin Lin , Linjie Li , Lijuan Wang , Zicheng Liu

The success of Zero-shot Action Recognition (ZSAR) methods is intrinsically related to the nature of semantic side information used to transfer knowledge, although this aspect has not been primarily investigated in the literature. This work…

Computer Vision and Pattern Recognition · Computer Science 2022-09-27 Valter Estevam , Rayson Laroca , Helio Pedrini , David Menotti

Human action recognition is pivotal in computer vision, with applications ranging from surveillance to human-robot interaction. Despite the effectiveness of supervised skeleton-based methods, their reliance on exhaustive annotation limits…

Computer Vision and Pattern Recognition · Computer Science 2026-05-08 Yuxi Zhou , Zhengbo Zhang , Jingyu Pan , Zhiyu Lin , Zhigang Tu

This paper proposes a novel Zero-Shot Action Recognition~(ZSAR) method based on contrastive learning. In ZSAR, we aim to classify examples from classes that were missing during training. Two well-known problems remain in ZSAR: the semantic…

Computer Vision and Pattern Recognition · Computer Science 2026-05-05 Valter Estevam , Rayson Laroca , Helio Pedrini , David Menotti

Generalised zero-shot learning (GZSL) methods aim to classify previously seen and unseen visual classes by leveraging the semantic information of those classes. In the context of GZSL, semantic information is non-visual data such as a text…

Computer Vision and Pattern Recognition · Computer Science 2019-08-07 Rafael Felix , Ben Harwood , Michele Sasdelli , Gustavo Carneiro

Recent work on action recognition leverages 3D features and textual information to achieve state-of-the-art performance. However, most of the current few-shot action recognition methods still rely on 2D frame-level representations, often…

Computer Vision and Pattern Recognition · Computer Science 2023-11-13 Yutao Tang , Benjamin Bejar , Rene Vidal

Suffering from the semantic insufficiency and domain-shift problems, most of existing state-of-the-art methods fail to achieve satisfactory results for Zero-Shot Learning (ZSL). In order to alleviate these problems, we propose a novel…

Computer Vision and Pattern Recognition · Computer Science 2021-02-24 Hongxin Xiang , Cheng Xie , Ting Zeng , Yun Yang

Generalized zero shot learning (GZSL) is defined by a training process containing a set of visual samples from seen classes and a set of semantic samples from seen and unseen classes, while the testing process consists of the classification…

Computer Vision and Pattern Recognition · Computer Science 2019-02-07 Rafael Felix , Michele Sasdelli , Ian Reid , Gustavo Carneiro

We propose a novel Generalized Zero-Shot learning (GZSL) method that is agnostic to both unseen images and unseen semantic vectors during training. Prior works in this context propose to map high-dimensional visual features to the semantic…

Computer Vision and Pattern Recognition · Computer Science 2019-04-10 Pengkai Zhu , Hanxiao Wang , Venkatesh Saligrama

The number of categories for action recognition is growing rapidly and it has become increasingly hard to label sufficient training data for learning conventional models for all categories. Instead of collecting ever more data and labelling…

Computer Vision and Pattern Recognition · Computer Science 2016-12-05 Xun Xu , Timothy Hospedales , Shaogang Gong

The number of categories for action recognition is growing rapidly. It is thus becoming increasingly hard to collect sufficient training data to learn conventional models for each category. This issue may be ameliorated by the increasingly…

Computer Vision and Pattern Recognition · Computer Science 2015-11-17 Xun Xu , Timothy Hospedales , Shaogang Gong

Robustness to domain changes is a key capability for effective deployment of human action recognition systems in real-world scenarios, where action categories at inference can present important domain shifts or even unseen actions from…

Computer Vision and Pattern Recognition · Computer Science 2026-05-22 Yannick Porto , Renato Martins , Thomas Chalumeau , Cedric Demonceaux

Zero-Shot Learning (ZSL) promises to scale visual recognition by bypassing the conventional model training requirement of annotated examples for every category. This is achieved by establishing a mapping connecting low-level features and a…

Computer Vision and Pattern Recognition · Computer Science 2016-11-29 Xun Xu , Timothy M. Hospedales , Shaogang Gong

This paper investigates a challenging problem of zero-shot learning in the multi-label scenario (MLZSL), wherein, the model is trained to recognize multiple unseen classes within a sample (e.g., an image) based on seen classes and auxiliary…

Computer Vision and Pattern Recognition · Computer Science 2023-09-15 Ziming Liu , Jingcai Guo , Xiaocheng Lu , Song Guo , Peiran Dong , Jiewei Zhang

Generalized zero-shot learning (GZSL) aims to classify samples under the assumption that some classes are not observable during training. To bridge the gap between the seen and unseen classes, most GZSL methods attempt to associate the…

Computer Vision and Pattern Recognition · Computer Science 2021-08-30 Zhi Chen , Yadan Luo , Ruihong Qiu , Sen Wang , Zi Huang , Jingjing Li , Zheng Zhang

Zero-shot learning (ZSL) aims at recognizing unseen classes with knowledge transferred from seen classes. This is typically achieved by exploiting a semantic feature space (FS) shared by both seen and unseen classes, i.e., attributes or…

Machine Learning · Computer Science 2019-04-15 Jingcai Guo , Song Guo

Zero-Shot Learning (ZSL) has rapidly advanced in recent years. Towards overcoming the annotation bottleneck in the Sign Language Recognition (SLR), we explore the idea of Zero-Shot Sign Language Recognition (ZS-SLR) with no annotated visual…

Computer Vision and Pattern Recognition · Computer Science 2021-09-06 Razieh Rastgoo , Kourosh Kiani , Sergio Escalera , Mohammad Sabokrou
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