Research Article

Online Detection of Abnormal Events in Video Streams

Figure 5

Detection results of the lawn scene. (a) The detection result of one normal frame. (b) The detection result of one abnormal panic frame. (c) ROC curve of different features of the lawn scene results via one-class SVM. All the training samples are learned together offline. The biggest AUC value is 0.9591. (d) ROC curve of different features results via Strategy 1 online one-class SVM. The biggest AUC value is 0.9581.
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(a) Normal lawn scene
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(b) Abnormal lawn scene
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(c) ROC train offline
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(d) ROC Strategy 1