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In this paper, we investigate a practical yet challenging task: On-the-fly Category Discovery (OCD). This task focuses on the online identification of newly arriving stream data that may belong to both known and unknown categories,…

Computer Vision and Pattern Recognition · Computer Science 2025-07-08 Xiao Liu , Nan Pu , Haiyang Zheng , Wenjing Li , Nicu Sebe , Zhun Zhong

On-the-Fly Category Discovery (OCD) aims to recognize known classes while simultaneously discovering emerging novel categories during inference, using supervision only from known classes during offline training. Existing approaches rely…

Computer Vision and Pattern Recognition · Computer Science 2026-03-18 Bohan Zhang , Weidong Tang , Zhixiang Chi , Yi Jin , Zhenbo Li , Yang Wang , Yanan Wu

On-the-fly category discovery (OCD) aims to recognize known categories while simultaneously discovering novel ones from an unlabeled online stream, using a model trained only on labeled data. Existing approaches freeze the feature extractor…

Computer Vision and Pattern Recognition · Computer Science 2026-03-10 Yanan Wu , Yuhan Yan , Tailai Chen , Zhixiang Chi , ZiZhang Wu , Yi Jin , Yang Wang , Zhenbo Li

On-the-Fly Category Discovery (OCD) requires a model, trained on an offline support set, to recognize known classes while discovering new ones from an online streaming sequence. Existing methods focus heavily on offline training. They aim…

Computer Vision and Pattern Recognition · Computer Science 2026-04-14 Weidong Tang , Bohan Zhang , Zhixiang Chi , ZiZhang Wu , Yang Wang , Yanan Wu

We study streaming data with categorical features where the vocabulary of categorical feature values is changing and can even grow unboundedly over time. Feature hashing is commonly used as a pre-processing step to map these categorical…

Machine Learning · Computer Science 2025-12-02 Aodong Li , Abishek Sankararaman , Balakrishnan Narayanaswamy

Context-aware compression techniques have gained increasing attention as model sizes continue to grow, introducing computational bottlenecks that hinder efficient deployment. A structured encoding approach was proposed to selectively…

Computation and Language · Computer Science 2025-02-13 Barnaby Schmitt , Alistair Grosvenor , Matthias Cunningham , Clementine Walsh , Julius Pembrokeshire , Jonathan Teel

Object categories inherently form a hierarchy with different levels of concept abstraction, especially for fine-grained categories. For example, birds (Aves) can be categorized according to a four-level hierarchy of order, family, genus,…

Computer Vision and Pattern Recognition · Computer Science 2018-08-15 Tianshui Chen , Wenxi Wu , Yuefang Gao , Le Dong , Xiaonan Luo , Liang Lin

Existing fine-grained hashing methods typically lack code interpretability as they compute hash code bits holistically using both global and local features. To address this limitation, we propose ConceptHash, a novel method that achieves…

Computer Vision and Pattern Recognition · Computer Science 2024-06-13 Kam Woh Ng , Xiatian Zhu , Yi-Zhe Song , Tao Xiang

This paper tackles the problem of novel category discovery (NCD), which aims to discriminate unknown categories in large-scale image collections. The NCD task is challenging due to the closeness to the real-world scenarios, where we have…

Computer Vision and Pattern Recognition · Computer Science 2022-08-02 Lu Zhang , Lu Qi , Xu Yang , Hong Qiao , Ming-Hsuan Yang , Zhiyong Liu

The key to OOD detection has two aspects: generalized feature representation and precise category description. Recently, vision-language models such as CLIP provide significant advances in both two issues, but constructing precise category…

Computer Vision and Pattern Recognition · Computer Science 2024-11-15 Kai Liu , Zhihang Fu , Chao Chen , Sheng Jin , Ze Chen , Mingyuan Tao , Rongxin Jiang , Jieping Ye

We introduce the first unified framework for *Fine-Grained Domain-Generalized Generalized Category Discovery* (FG-DG-GCD), bringing open-world recognition closer to real-world deployment under domain shift. Unlike conventional GCD, which…

Computer Vision and Pattern Recognition · Computer Science 2026-03-17 Vaibhav Rathore , Divyam Gupta , Moloud Abdar , Subhasis Chaudhuri , Biplab Banerjee

Novel category discovery aims at adapting models trained on known categories to novel categories. Previous works only focus on the scenario where known and novel categories are of the same granularity. In this paper, we investigate a new…

Computation and Language · Computer Science 2022-10-17 Wenbin An , Feng Tian , Ping Chen , Siliang Tang , Qinghua Zheng , QianYing Wang

Neural networks that are trained on limited category samples often mispredict out-of-distribution (OOD) objects. We observe that features of the same category are more tightly clustered in feature space, while those of different categories…

Computer Vision and Pattern Recognition · Computer Science 2025-01-29 Junkun Chen , Jilin Mei , Liang Chen , Fangzhou Zhao , Yan Xing , Yu Hu

Open-world object detection (OWOD) is a challenging problem that combines object detection with incremental learning and open-set learning. Compared to standard object detection, the OWOD setting is task to: 1) detect objects seen during…

Computer Vision and Pattern Recognition · Computer Science 2023-02-24 Jinan Yu , Liyan Ma , Zhenglin Li , Yan Peng , Shaorong Xie

In this work, we propose CODE, an extension of existing work from the field of explainable AI that identifies class-specific recurring patterns to build a robust Out-of-Distribution (OoD) detection method for visual classifiers. CODE does…

Computer Vision and Pattern Recognition · Computer Science 2023-11-23 Romain Xu-Darme , Julien Girard-Satabin , Darryl Hond , Gabriele Incorvaia , Zakaria Chihani

Fine-grained hashing has become a powerful solution for rapid and efficient image retrieval, particularly in scenarios requiring high discrimination between visually similar categories. To enable each hash bit to correspond to specific…

Computer Vision and Pattern Recognition · Computer Science 2025-09-23 Peng Wang , Yong Li , Lin Zhao , Xiu-Shen Wei

Video highlights detection (VHD) is an active research field in computer vision, aiming to locate the most user-appealing clips given raw video inputs. However, most VHD methods are based on the closed world assumption, i.e., a fixed number…

Computer Vision and Pattern Recognition · Computer Science 2023-12-13 Sen Pei , Shixiong Xu , Xiaojie Jin

The crux of resolving fine-grained visual classification (FGVC) lies in capturing discriminative and class-specific cues that correspond to subtle visual characteristics. Recently, frequency decomposition/transform based approaches have…

Computer Vision and Pattern Recognition · Computer Science 2025-11-14 Qin Xu , Lili Zhu , Xiaoxia Cheng , Bo Jiang

Out-of-distribution (OOD) detection in deep learning has traditionally been framed as a binary task, where samples are either classified as belonging to the known classes or marked as OOD, with little attention given to the semantic…

Machine Learning · Computer Science 2025-03-28 Erik Wallin , Fredrik Kahl , Lars Hammarstrand

Deep neural networks have achieved remarkable performance on a range of classification tasks, with softmax cross-entropy (CE) loss emerging as the de-facto objective function. The CE loss encourages features of a class to have a higher…

Computer Vision and Pattern Recognition · Computer Science 2021-03-26 Kanchana Ranasinghe , Muzammal Naseer , Munawar Hayat , Salman Khan , Fahad Shahbaz Khan
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