semantic-anchor-aligned-model-for-interpretable-video-anomaly

Semantic Anchor-Aligned Model for Interpretable Video Anomaly Detection under Cross-Modal Weak Supervision

Weakly supervised video anomaly detection is a key technique that relies solely on video-level labels to identify anomalous events. However, traditional ...

China Aerospace Academy of Systems Science and Engineering

Aerospace Hongka Intelligent Technology (Beijing) Co., Ltd.

Weakly supervised video anomaly detection (WSVAD) aims to identify unusual events using only video-level labels. However, current methods face several key challenges, including ineffective modelling of complex temporal dependencies, indistinct feature boundaries between visually similar normal and abnormal events, and high false alarm rates caused by an inability to distinguish salient events from complex background noise. This paper proposes a novel method that systematically enhances feature representation and discrimination to address these challenges. The proposed method first builds robust temporal representations by employing a hierarchical multi-scale temporal encoder and a position-aware global relation network to capture both local and long-range dependencies. The core of this method is the dual-stream attention-enhanced memory network, which achieves precise discrimination by learning distinct normal and abnormal patterns via dual memory banks, while utilising bidirectional spatial attention to mitigate background noise and focus on salient events before memory querying. The models underwent a comprehensive evaluation utilising solely RGB features on two demanding public datasets, UCF-Crime and XD-Violence. The experimental findings indicate that the proposed method attains state-of-the-art performance, achieving 87.43% AUC on UCF-Crime and 85.51% AP on XD-Violence. This result demonstrates that the proposed "attention-guided prototype matching" paradigm effectively resolves the aforementioned challenges, enabling robust and precise anomaly detection.

Weishan Gao

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