Weakly and Partially Supervised Learning Frameworks for Anomaly Detection

23 Jul 2020  ·  Bruno Degardin ·

The main objective is to provide several solutions to the mentioned problems, by focusing on analyzing previous state-of-the-art methods and presenting an extensive overview to clarify the concepts employed on capturing normal and abnormal patterns. Also, by exploring different strategies, we were able to develop new approaches that consistently advance the state-of-the-art performance. Moreover, we announce the availability of a new large-scale first of its kind dataset fully annotated at the frame level, concerning a specific anomaly detection event with a wide diversity in fighting scenarios, that can be freely used by the research community. Along with this document with the purpose of requiring minimal supervision, two different proposals are described; the first method employs the recent technique of self-supervised learning to avoid the laborious task of annotation, where the training set is autonomously labeled using an iterative learning framework composed of two independent experts that feed data to each other through a Bayesian framework. The second proposal explores a new method to learn an anomaly ranking model in the multiple instance learning paradigm by leveraging weakly labeled videos, where the training labels are done at the video-level. The experiments were conducted in several well-known datasets, and our solutions solidly outperform the state-of-the-art. Additionally, as a proof-of-concept system, we also present the results of collected real-world simulations in different environments to perform a field test of our learned models.

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Task Dataset Model Metric Name Metric Value Global Rank Benchmark
Abnormal Event Detection In Video UBI-Fights GMM AUC 0.906 # 1
Decidability 1.386 # 1
EER 0.160 # 1
Anomaly Detection In Surveillance Videos UCF-Crime GMM-based ROC AUC 75.90 # 13
Decidability 0.885 # 1
EER 0.302 # 1


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