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Online Inference Model for Traffic Pattern Analysis and Anomaly Detection : 교통 패턴 분석과 비정상 탐지를 위한 온라인 추론 모델
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- Authors
- Advisor
- 최진영
- Major
- 공과대학 전기·컴퓨터공학부
- Issue Date
- 2015-02
- Publisher
- 서울대학교 대학원
- Keywords
- trajectory analysis ; topic model ; latent Dirichlet allocation ; surveillance
- Description
- 학위논문 (박사)-- 서울대학교 대학원 : 전기·컴퓨터공학부, 2015. 2. 최진영.
- Abstract
- In this thesis, we propose a method for modeling trajectory patterns with both regional and velocity observations through the probabilistic inference model. By embedding Gaussian models into the discrete topic model framework, our method uses continuous velocity as well as regional observations unlike existing approaches. In addition, the proposed framework combined with Hidden Markov Model can cover the temporal transition of the scene state, which is useful in checking a violation of the rule that some conflict topics (e.g. two cross-traffic patterns) should not occur at the same time. To achieve online learning even with the complexity of the proposed model, we suggest a novel learning scheme instead of collapsed Gibbs sampling. The proposed two-stage greedy learning scheme is not only efficient at reducing the search space but also accurate in a way that the accuracy of online learning becomes not worse than that of the batch learning. To validate the performance of our method, experiments were conducted on various datasets. Experimental results show that our model explains satisfactorily the trajectory patterns with respect to scene understanding, anomaly detection, and prediction.
- Language
- English
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