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- W4319299969 abstract "Weakly supervised Video Anomaly Detection (wVAD) aims to distinguish anomalies from normal events based on video-level supervision. Most existing works utilize Multiple Instance Learning (MIL) with ranking loss to tackle this task. These methods, however, rely on noisy predictions from a MIL-based classifier for target instance selection in ranking loss, degrading model performance. To overcome this problem, we propose Normality Guided Multiple Instance Learning (NG-MIL) framework, which encodes diverse normal patterns from noise-free normal videos into prototypes for constructing a similarity-based classifier. By ensembling predictions of two classifiers, our method could refine the anomaly scores, reducing training instability from weak labels. Moreover, we introduce normality clustering and normality guided triplet loss constraining inner bag instances to boost the effect of NG-MIL and increase the discriminability of classifiers. Extensive experiments on three public datasets (ShanghaiTech, UCF-Crime, XD-Violence) demonstrate that our method is comparable to or better than existing weakly supervised methods, achieving state-of-the-art results." @default.
- W4319299969 created "2023-02-07" @default.
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- W4319299969 date "2023-01-01" @default.
- W4319299969 modified "2023-10-01" @default.
- W4319299969 title "Normality Guided Multiple Instance Learning for Weakly Supervised Video Anomaly Detection" @default.
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- W4319299969 doi "https://doi.org/10.1109/wacv56688.2023.00269" @default.
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