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Pretrained vision-language models, such as CLIP, show promising zero-shot performance across a wide variety of datasets. For closed-set classification tasks, however, there is an inherent limitation: CLIP image encoders are typically…

Computer Vision and Pattern Recognition · Computer Science 2023-09-14 Piyapat Saranrittichai , Mauricio Munoz , Volker Fischer , Chaithanya Kumar Mummadi

Adapting CLIP for anomaly detection on unseen objects has shown strong potential in a zero-shot manner. However, existing methods typically rely on a single textual space to align with visual semantics across diverse objects and domains.…

Computer Vision and Pattern Recognition · Computer Science 2026-03-02 Qihang Zhou , Binbin Gao , Guansong Pang , Xin Wang , Jiming Chen , Shibo He

Current zero-shot anomaly detection (ZSAD) methods show remarkable success in prompting large pre-trained vision-language models to detect anomalies in a target dataset without using any dataset-specific training or demonstration. However,…

Computer Vision and Pattern Recognition · Computer Science 2025-10-06 Jiawen Zhu , Yew-Soon Ong , Chunhua Shen , Guansong Pang

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

Few-shot anomaly detection methods can effectively address data collecting difficulty in industrial scenarios. Compared to 2D few-shot anomaly detection (2D-FSAD), 3D few-shot anomaly detection (3D-FSAD) is still an unexplored but essential…

Computer Vision and Pattern Recognition · Computer Science 2024-06-28 Zuo Zuo , Jiahao Dong , Yao Wu , Yanyun Qu , Zongze Wu

Large-scale pre-trained models have demonstrated impressive performance in vision and language tasks within open-world scenarios. Due to the lack of comparable pre-trained models for 3D shapes, recent methods utilize language-image…

Computer Vision and Pattern Recognition · Computer Science 2024-09-12 Dan Song , Xinwei Fu , Ning Liu , Weizhi Nie , Wenhui Li , Lanjun Wang , You Yang , Anan Liu

Vision language foundation models such as CLIP exhibit impressive zero-shot generalization yet remain vulnerable to spurious correlations across visual and textual modalities. Existing debiasing approaches often address a single modality…

Computer Vision and Pattern Recognition · Computer Science 2026-01-06 Sunny Gupta , Shounak Das , Amit Sethi

Few-normal shot anomaly detection (FNSAD) aims to detect abnormal regions in images using only a few normal training samples, making the task highly challenging due to limited supervision and the diversity of potential defects. Recent…

Computer Vision and Pattern Recognition · Computer Science 2026-01-23 Morteza Poudineh , Marc Lalonde

With the growing interest in pretrained vision-language models like CLIP, recent research has focused on adapting these models to downstream tasks. Despite achieving promising results, most existing methods require labeled data for all…

Computer Vision and Pattern Recognition · Computer Science 2023-07-17 Zhengbo Wang , Jian Liang , Ran He , Nan Xu , Zilei Wang , Tieniu Tan

Medical anomaly detection (AD) is challenging due to diverse imaging modalities, anatomical variations, and limited labeled data. We propose a novel approach combining visual adapters and prompt learning with Partial Optimal Transport (POT)…

Computer Vision and Pattern Recognition · Computer Science 2025-07-10 Mahshid Shiri , Cigdem Beyan , Vittorio Murino

Vision-language models such as CLIP are capable of mapping the different modality data into a unified feature space, enabling zero/few-shot inference by measuring the similarity of given images and texts. However, most existing methods…

Computer Vision and Pattern Recognition · Computer Science 2024-07-29 Xingyu Zhu , Beier Zhu , Yi Tan , Shuo Wang , Yanbin Hao , Hanwang Zhang

Recent advancements in large-scale visual-language pre-trained models have led to significant progress in zero-/few-shot anomaly detection within natural image domains. However, the substantial domain divergence between natural and medical…

Computer Vision and Pattern Recognition · Computer Science 2024-03-20 Chaoqin Huang , Aofan Jiang , Jinghao Feng , Ya Zhang , Xinchao Wang , Yanfeng Wang

Pre-trained Vision-Language Models (VLMs) struggle with Zero-Shot Anomaly Detection (ZSAD) due to a critical adaptation gap: they lack the local inductive biases required for dense prediction and employ inflexible feature fusion paradigms.…

Computer Vision and Pattern Recognition · Computer Science 2026-03-30 Ke Ma , Jun Long , Hongxiao Fei , Liujie Hua , Zhen Dai , Yueyi Luo

CLIP has demonstrated strong generalization in visual domains through natural language supervision, even for video action recognition. However, most existing approaches that adapt CLIP for action recognition have primarily focused on…

Computer Vision and Pattern Recognition · Computer Science 2026-04-27 Hyo Jin Jon , Longbin Jin , Eun Yi Kim

Recently, the powerful generalization ability exhibited by foundation models has brought forth new solutions for zero-shot anomaly segmentation tasks. However, guiding these foundation models correctly to address downstream tasks remains a…

Computer Vision and Pattern Recognition · Computer Science 2025-10-14 Yanning Hou , Ke Xu , Junfa Li , Yanran Ruan , Jianfeng Qiu

Zero-shot action recognition (ZSAR) requires collaborative multi-modal spatiotemporal understanding. However, finetuning CLIP directly for ZSAR yields suboptimal performance, given its inherent constraints in capturing essential temporal…

Computer Vision and Pattern Recognition · Computer Science 2025-02-11 Yating Yu , Congqi Cao , Yueran Zhang , Qinyi Lv , Lingtong Min , Yanning Zhang

Automatic image anomaly detection is important for quality inspection in the manufacturing industry. The usual unsupervised anomaly detection approach is to train a model for each object class using a dataset of normal samples. However, a…

Computer Vision and Pattern Recognition · Computer Science 2024-09-04 Yuanwei Li , Elizaveta Ivanova , Martins Bruveris

In unsupervised adaptation for vision-language models such as CLIP, pseudo-labels derived from zero-shot predictions often exhibit significant noise, particularly under domain shifts or in visually complex scenarios. Conventional…

Machine Learning · Computer Science 2025-07-31 Eman Ali , Chetan Arora , Muhammad Haris Khan

Contrastive Vision-Language Pre-training, known as CLIP, has provided a new paradigm for learning visual representations using large-scale image-text pairs. It shows impressive performance on downstream tasks by zero-shot knowledge…

Computer Vision and Pattern Recognition · Computer Science 2022-07-21 Renrui Zhang , Zhang Wei , Rongyao Fang , Peng Gao , Kunchang Li , Jifeng Dai , Yu Qiao , Hongsheng Li

Contrastive Language-Image Pre-training (CLIP) has been shown to learn visual representations with great transferability, which achieves promising accuracy for zero-shot classification. To further improve its downstream performance,…

Computer Vision and Pattern Recognition · Computer Science 2022-12-20 Ziyu Guo , Renrui Zhang , Longtian Qiu , Xianzheng Ma , Xupeng Miao , Xuming He , Bin Cui