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학술대회 Generative Cooperative Learning for Unsupervised Video Anomaly Detection
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무함마드, Arif Mahmood, M. Haris Khan, Mattia Segu, Fisher Yu, 이승익
Conference on Computer Vision and Pattern Recognition (CVPR) 2022, pp.14744-14754
Video anomaly detection is well investigated in weakly-supervised and one-class classification (OCC) settings. However, unsupervised video anomaly detection methods are quite sparse, likely because anomalies are less frequent in occurrence and usually not well-defined, which when coupled with the absence of ground truth supervision, could adversely affect the performance of the learning algorithms. This problem is challenging yet rewarding as it can completely eradicate the costs of obtaining laborious annotations and enable such systems to be deployed without human intervention. To this end, we propose a novel unsupervised Generative Cooperative Learning (GCL) approach for video anomaly detection that exploits the low frequency of anomalies towards building a cross-supervision between a generator and a discriminator. In essence, both networks get trained in a cooperative fashion, thereby allowing unsupervised learning. We conduct extensive experiments on two large-scale video anomaly detection datasets, UCF crime and ShanghaiTech. Consistent improvement over the existing state-of-the-art unsupervised and OCC methods corroborate the effectiveness of our approach.
KSP 제안 키워드
Cooperative Learning, Coupled with, Detection Method, One-class classification(OCC), Video anomaly detection, Weakly supervised, Well-defined, existing state, ground truth, human intervention, large-scale