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Visual object counting has recently shifted towards class-agnostic counting (CAC), which addresses the challenge of counting objects across arbitrary categories, a crucial capability for flexible and generalizable counting systems. Unlike…

Computer Vision and Pattern Recognition · Computer Science 2026-02-10 Luca Ciampi , Ali Azmoudeh , Elif Ecem Akbaba , Erdi Sarıtaş , Ziya Ata Yazıcı , Hazım Kemal Ekenel , Giuseppe Amato , Fabrizio Falchi

Class-Agnostic object Counting (CAC) involves counting instances of objects from arbitrary classes within an image. Due to its practical importance, CAC has received increasing attention in recent years. Most existing methods assume a…

Computer Vision and Pattern Recognition · Computer Science 2026-01-21 Michail Spanakis , Iason Oikonomidis , Antonis Argyros

Class-Agnostic Counting (CAC) seeks to accurately count objects in a given image with only a few reference examples. While previous methods achieving this relied on additional training, recent efforts have shown that it's possible to…

Computer Vision and Pattern Recognition · Computer Science 2025-01-07 Yuhao Lin , Haiming Xu , Lingqiao Liu , Javen Qinfeng Shi

Class-agnostic counting (CAC) has numerous potential applications across various domains. The goal is to count objects of an arbitrary category during testing, based on only a few annotated exemplars. In this paper, we point out that the…

Computer Vision and Pattern Recognition · Computer Science 2023-07-18 Jingyi Xu , Hieu Le , Dimitris Samaras

Class-agnostic counting (CAC) aims to count all instances in a query image given few exemplars. A standard pipeline is to extract visual features from exemplars and match them with query images to infer object counts. Two essential…

Computer Vision and Pattern Recognition · Computer Science 2022-03-17 Min Shi , Hao Lu , Chen Feng , Chengxin Liu , Zhiguo Cao

Class-agnostic counting (CAC) aims to count objects of interest from a query image given few exemplars. This task is typically addressed by extracting the features of query image and exemplars respectively and then matching their feature…

Computer Vision and Pattern Recognition · Computer Science 2024-03-05 Zhicheng Wang , Liwen Xiao , Zhiguo Cao , Hao Lu

In class-agnostic object counting, the goal is to estimate the total number of object instances in an image without distinguishing between specific categories. Existing methods often predict this count without considering class-specific…

Computer Vision and Pattern Recognition · Computer Science 2025-02-18 Huilin Zhu , Jingling Yuan , Zhengwei Yang , Yu Guo , Xian Zhong , Shengfeng He

Nearly all existing counting methods are designed for a specific object class. Our work, however, aims to create a counting model able to count any class of object. To achieve this goal, we formulate counting as a matching problem, enabling…

Computer Vision and Pattern Recognition · Computer Science 2018-11-02 Erika Lu , Weidi Xie , Andrew Zisserman

Class-agnostic counting methods enumerate objects of an arbitrary class, providing tremendous utility in many fields. Prior works have limited usefulness as they require either a set of examples of the type to be counted or that the query…

Computer Vision and Pattern Recognition · Computer Science 2024-07-15 Michael A. Hobley , Victor A. Prisacariu

We propose a novel framework for interactive class-agnostic object counting, where a human user can interactively provide feedback to improve the accuracy of a counter. Our framework consists of two main components: a user-friendly…

Computer Vision and Pattern Recognition · Computer Science 2023-09-12 Yifeng Huang , Viresh Ranjan , Minh Hoai

Current class-agnostic counting methods can generalise to unseen classes but usually require reference images to define the type of object to be counted, as well as instance annotations during training. Reference-less class-agnostic…

Computer Vision and Pattern Recognition · Computer Science 2022-09-07 Michael Hobley , Victor Prisacariu

Incremental object detection is fundamentally challenged by catastrophic forgetting. A major factor contributing to this issue is background shift, where background categories in sequential tasks may overlap with either previously learned…

Computer Vision and Pattern Recognition · Computer Science 2025-04-01 Mingyi Guo , Yuyang Liu , Zhiyuan Yan , Zongying Lin , Peixi Peng , Yonghong Tian

Open-world text-guided class-agnostic counting (CAC) has emerged as a flexible paradigm for counting arbitrary object classes by using natural language prompts. However, current evaluation protocols primarily focus on standard counting…

Computer Vision and Pattern Recognition · Computer Science 2026-05-14 Giacomo Pacini , Luca Ciampi , Nicola Messina , Nicola Tonellotto , Giuseppe Amato , Fabrizio Falchi

Prevalent Computational Aberration Correction (CAC) methods are typically tailored to specific optical systems, leading to poor generalization and labor-intensive re-training for new lenses. Developing CAC paradigms capable of generalizing…

Computer Vision and Pattern Recognition · Computer Science 2026-03-13 Xiaolong Qian , Qi Jiang , Yao Gao , Lei Sun , Zhonghua Yi , Kailun Yang , Luc Van Gool , Kaiwei Wang

The class-agnostic counting (CAC) task has recently been proposed to solve the problem of counting all objects of an arbitrary class with several exemplars given in the input image. To address this challenging task, existing leading methods…

Computer Vision and Pattern Recognition · Computer Science 2025-07-14 Hefeng Wu , Yandong Chen , Lingbo Liu , Tianshui Chen , Keze Wang , Liang Lin

The class-agnostic counting (CAC) problem has caught increasing attention recently due to its wide societal applications and arduous challenges. To count objects of different categories, existing approaches rely on user-provided exemplars,…

Computer Vision and Pattern Recognition · Computer Science 2023-02-13 Mingjie Wang , Yande Li , Jun Zhou , Graham W. Taylor , Minglun Gong

The counting task, which plays a fundamental role in numerous applications (e.g., crowd counting, traffic statistics), aims to predict the number of objects with various densities. Existing object counting tasks are designed for a single…

Computer Vision and Pattern Recognition · Computer Science 2023-07-03 Shengqin Jiang , Qing Wang , Fengna Cheng , Yuankai Qi , Qingshan Liu

We tackle the task of Class Agnostic Counting, which aims to count objects in a novel object category at test time without any access to labeled training data for that category. All previous class agnostic counting methods cannot work in a…

Computer Vision and Pattern Recognition · Computer Science 2022-05-31 Viresh Ranjan , Minh Hoai

Class-agnostic object counting aims to count all objects in an image with respect to example boxes or class names, \emph{a.k.a} few-shot and zero-shot counting. In this paper, we propose a generalized framework for both few-shot and…

Computer Vision and Pattern Recognition · Computer Science 2024-03-28 Zhizhong Huang , Mingliang Dai , Yi Zhang , Junping Zhang , Hongming Shan

Zero-shot object counting (ZSOC) aims to enumerate objects of arbitrary categories specified by text descriptions without requiring visual exemplars. However, existing methods often treat counting as a coarse retrieval task, suffering from…

Computer Vision and Pattern Recognition · Computer Science 2026-03-18 Da Zhang , Bingyu Li , Feiyu Wang , Zhiyuan Zhao , Junyu Gao
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