CLAWS: Clustering Assisted Weakly Supervised Learning with Normalcy Suppression for Anomalous Event Detection
This work provides a strong specific gain in anomalous event detection for video surveillance and security applications, improving performance over prior methods.
This paper addresses the challenge of weakly supervised anomalous event detection in videos, which is difficult due to rare anomalies and noisy labels. The proposed method achieves 83.03% frame-level AUC on UCF Crime and 89.67% on ShanghaiTech datasets, outperforming existing state-of-the-art algorithms.
Learning to detect real-world anomalous events through video-level labels is a challenging task due to the rare occurrence of anomalies as well as noise in the labels. In this work, we propose a weakly supervised anomaly detection method which has manifold contributions including1) a random batch based training procedure to reduce inter-batch correlation, 2) a normalcy suppression mechanism to minimize anomaly scores of the normal regions of a video by taking into account the overall information available in one training batch, and 3) a clustering distance based loss to contribute towards mitigating the label noise and to produce better anomaly representations by encouraging our model to generate distinct normal and anomalous clusters. The proposed method obtains83.03% and 89.67% frame-level AUC performance on the UCF Crime and ShanghaiTech datasets respectively, demonstrating its superiority over the existing state-of-the-art algorithms.