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Zero-shot anomaly detection (ZSAD) requires detecting and localizing anomalies without access to target-class anomaly samples. Mainstream methods rely on vision-language models (VLMs) such as CLIP: they build hand-crafted or learned prompt…

Computer Vision and Pattern Recognition · Computer Science 2026-03-10 Yanning Hou , Peiyuan Li , Zirui Liu , Yitong Wang , Yanran Ruan , Jianfeng Qiu , Ke Xu

Vision-language models (VLMs), such as CLIP, have demonstrated impressive zero-shot capabilities for various downstream tasks. Their performance can be further enhanced through few-shot prompt tuning methods. However, current studies…

Computer Vision and Pattern Recognition · Computer Science 2024-06-04 Zhi Zhou , Ming Yang , Jiang-Xin Shi , Lan-Zhe Guo , Yu-Feng Li

Few-shot anomaly detection streamlines and simplifies industrial safety inspection. However, limited samples make accurate differentiation between normal and abnormal features challenging, and even more so under category-agnostic…

Computer Vision and Pattern Recognition · Computer Science 2025-10-03 Guangyao Zhai , Yue Zhou , Xinyan Deng , Lars Heckler , Nassir Navab , Benjamin Busam

Drone-captured images present significant challenges in object detection due to varying shooting conditions, which can alter object appearance and shape. Factors such as drone altitude, angle, and weather cause these variations, influencing…

Computer Vision and Pattern Recognition · Computer Science 2024-11-15 Chanyeong Park , Heegwang Kim , Joonki Paik

Thanks to the large pre-trained vision-language models (VLMs) like CLIP, we can craft a zero-shot classifier by "prompt", e.g., the confidence score of an image being "[CLASS]" can be obtained by using the VLM provided similarity measure…

Computer Vision and Pattern Recognition · Computer Science 2025-08-14 Beier Zhu , Yulei Niu , Yucheng Han , Yue Wu , Hanwang Zhang

Vision-language models (VLMs), such as CLIP, have shown strong generalization under zero-shot settings, yet adapting them to downstream tasks with limited supervision remains a significant challenge. Existing multi-modal prompt learning…

Computer Vision and Pattern Recognition · Computer Science 2025-12-01 Silin Cheng , Kai Han

Vision-language models have recently shown strong generalization in zero-shot anomaly detection (ZSAD), enabling the detection of unseen anomalies without task-specific supervision. However, existing approaches typically rely on fixed…

Computer Vision and Pattern Recognition · Computer Science 2026-03-19 Peng Chen , Chao Huang

Recent progress in deterministic prompt learning has become a promising alternative to various downstream vision tasks, enabling models to learn powerful visual representations with the help of pre-trained vision-language models. However,…

Computer Vision and Pattern Recognition · Computer Science 2023-04-04 Hyeongjun Kwon , Taeyong Song , Somi Jeong , Jin Kim , Jinhyun Jang , Kwanghoon Sohn

Few-shot anomaly detection (FSAD) denotes the identification of anomalies within a target category with a limited number of normal samples. Existing FSAD methods largely rely on pre-trained feature representations to detect anomalies, but…

Computer Vision and Pattern Recognition · Computer Science 2025-12-18 Yuxin Jiang , Yunkang Cao , Weiming Shen

Large-scale contrastive vision-language pre-training has shown significant progress in visual representation learning. Unlike traditional visual systems trained by a fixed set of discrete labels, a new paradigm was introduced in…

Computer Vision and Pattern Recognition · Computer Science 2025-03-26 Peng Gao , Shijie Geng , Renrui Zhang , Teli Ma , Rongyao Fang , Yongfeng Zhang , Hongsheng Li , Yu Qiao

Visual anomaly detection targets to detect images that notably differ from normal pattern, and it has found extensive application in identifying defective parts within the manufacturing industry. These anomaly detection paradigms…

Computer Vision and Pattern Recognition · Computer Science 2024-11-15 Anindya Sundar Das , Guansong Pang , Monowar Bhuyan

Anomaly detection aims to recognize samples with anomalous and unusual patterns with respect to a set of normal data. This is significant for numerous domain applications, such as industrial inspection, medical imaging, and security…

Machine Learning · Computer Science 2020-03-30 Shuo Wang , Tianle Chen , Shangyu Chen , Carsten Rudolph , Surya Nepal , Marthie Grobler

The potential for zero-shot generalization in vision-language (V-L) models such as CLIP has spurred their widespread adoption in addressing numerous downstream tasks. Previous methods have employed test-time prompt tuning to adapt the model…

Computer Vision and Pattern Recognition · Computer Science 2024-04-15 Anant Khandelwal

Recent advances in pre-training vision-language models (VLMs), e.g., contrastive language-image pre-training (CLIP) methods, have shown great potential in learning out-of-distribution (OOD) representations. Despite showing competitive…

Computer Vision and Pattern Recognition · Computer Science 2025-09-22 Min Zhang , Bo Jiang , Jie Zhou , Yimeng Liu , Xin Lin

Zero-shot anomaly detection (ZSAD) enables identifying and localizing defects in unseen categories by relying solely on generalizable features rather than requiring any labeled examples of anomalies. However, existing ZSAD methods, whether…

Computer Vision and Pattern Recognition · Computer Science 2025-11-26 Zihan Wang , Samira Ebrahimi Kahou , Narges Armanfard

Recent advances in large pre-trained vision-language models have demonstrated remarkable performance on zero-shot downstream tasks. Building upon this, recent studies, such as CoOp and CoCoOp, have proposed the use of prompt learning, where…

Computer Vision and Pattern Recognition · Computer Science 2024-04-26 Gahyeon Kim , Sohee Kim , Seokju Lee

Textual-based prompt learning methods primarily employ multiple learnable soft prompts and hard class tokens in a cascading manner as text inputs, aiming to align image and text (category) spaces for downstream tasks. However, current…

Computer Vision and Pattern Recognition · Computer Science 2025-07-22 Zheng Li , Yibing Song , Ming-Ming Cheng , Xiang Li , Jian Yang

Prompt learning has been widely adopted to efficiently adapt vision-language models (VLMs), e.g. CLIP, for few-shot image classification. Despite their success, most prompt learning methods trade-off between classification accuracy and…

Computer Vision and Pattern Recognition · Computer Science 2024-12-02 Marc Lafon , Elias Ramzi , Clément Rambour , Nicolas Audebert , Nicolas Thome

Vision-language models (VLMs) offer flexible object detection through natural language prompts but suffer from performance variability depending on prompt phrasing. In this paper, we introduce a method for automated prompt refinement using…

Computer Vision and Pattern Recognition · Computer Science 2025-05-15 Lucas Choi , Ross Greer

Pre-trained Vision-Language Models (VLMs) have recently shown promise in detecting anomalies. However, previous approaches are fundamentally limited by their reliance on human-designed prompts and the lack of accessible anomaly samples,…

Computer Vision and Pattern Recognition · Computer Science 2025-08-25 Pi-Wei Chen , Jerry Chun-Wei Lin , Wei-Han Chen , Jia Ji , Zih-Ching Chen , Feng-Hao Yeh , Chao-Chun Chen