VLAVAD: Vision-Language Models Assisted Unsupervised Video Anomaly Detection


Changkang Li (Beijing University of Aeronautics and Astronautics), Yalong Jiang (Beihang University)
The 35th British Machine Vision Conference
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Abstract

Video anomaly detection is a subject of great interest across industrial and academic domains because of its crucial role in computer vision applications. However, the inherent unpredictability of anomalies and the scarcity of anomaly samples present significant challenges for unsupervised learning methods. To overcome the limitations of unsupervised learning, which stem from a lack of comprehensive prior knowledge about anomalies, we propose VLAVAD (Video-Language Models Assisted Anomaly Detection). Our method employs a cross-modal pre-trained model that leverages the inferential capabilities of large language models (LLMs) in conjunction with a Selective-Prompt Adapter (SPA) for selecting semantic space. Additionally, we introduce a Sequence State Space Module (S3M) that detects temporal inconsistencies in semantic features. By mapping high-dimensional visual features to low-dimensional semantic ones, our method significantly enhance the interpretability of unsupervised anomaly detection. Our proposed approach effectively tackles the challenge of detecting elusive anomalies that are hard to discern over periods, achieving SOTA on the challenging ShanghaiTech dataset.

Citation

@inproceedings{Li_2024_BMVC,
author    = {Changkang Li and Yalong Jiang},
title     = {VLAVAD: Vision-Language Models Assisted Unsupervised Video Anomaly Detection},
booktitle = {35th British Machine Vision Conference 2024, {BMVC} 2024, Glasgow, UK, November 25-28, 2024},
publisher = {BMVA},
year      = {2024},
url       = {https://papers.bmvc2024.org/0599.pdf}
}


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