Atomic Decomposition by Basis Pursuit
SIAM Journal on Scientific Computing
Recognition of Group Activities using Dynamic Probabilistic Networks
ICCV '03 Proceedings of the Ninth IEEE International Conference on Computer Vision - Volume 2
Semi-Supervised Adapted HMMs for Unusual Event Detection
CVPR '05 Proceedings of the 2005 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (CVPR'05) - Volume 1 - Volume 01
On-line trajectory clustering for anomalous events detection
Pattern Recognition Letters
Probabilistic Modeling of Scene Dynamics for Applications in Visual Surveillance
IEEE Transactions on Pattern Analysis and Machine Intelligence
Real-Time Abnormal Event Detection in Complicated Scenes
ICPR '10 Proceedings of the 2010 20th International Conference on Pattern Recognition
Stream-based active unusual event detection
ACCV'10 Proceedings of the 10th Asian conference on Computer vision - Volume Part I
Sparse reconstruction cost for abnormal event detection
CVPR '11 Proceedings of the 2011 IEEE Conference on Computer Vision and Pattern Recognition
Online detection of unusual events in videos via dynamic sparse coding
CVPR '11 Proceedings of the 2011 IEEE Conference on Computer Vision and Pattern Recognition
Task-Driven Dictionary Learning
IEEE Transactions on Pattern Analysis and Machine Intelligence
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In this paper, we present a method for detecting abnormal events in videos. In the proposed method, we define an event containing several sub-events. Sub-events can be viewed as instances and an event as a bag of instances in the multi-instance learning formulation. Given labeled events but with the labels of sub-events unknown, the proposed method is able to learn a dictionary together with a classification function. The dictionary is capable of generating discriminant sparse codes of sub-events while the classification function is able to classify an event. This method is suited for scenarios where the label of a sub-event is ambiguous, while the label of a set of sub-events is definite and is easy to obtain. Once the sparse codes of sub-events are generated, the classification of an event is carried out according to the result given by the classification function. An efficient optimization procedure of the proposed method is presented. Experiments show that the method is able to detect abnormal events with comparable or improved accuracy compared with other methods.