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Detection results of the lawn scene, (a) The detection result of a normal frame; (b) The detection result of an abnormal panic frame; (c) Receiver operating characteristic (ROC) curve of covariance descriptors constructed from different features F of the lawn scene detection results via LS-OC-SVM. All the training samples are learned together offline. The biggest AUC value is 0.9874; (d) ROC curve of detection results via online LS-OC-SVM. The biggest AUC value is 0.9874.
