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• W2290906593 abstract "This paper presents a modular system for both abnormal event detection and categorization in videos. Complementary normalcy models are built both globally at the image level and locally within pixels blocks. Three features are analyzed: (1) spatio-temporal evolution of binary motion where foreground pixels are detected using an enhanced background subtraction method that keeps track of temporarily static pixels; (2) optical flow, using a robust pyramidal KLT technique; and (3) motion temporal derivatives. At the local level, a normalcy MOG model is built for each block and for each flow feature and is made more compact using PCA. Then, the activity is analyzed qualitatively using a set of compact hybrid histograms embedding both optical flow orientation (or temporal gradient orientation) and foreground statistics. A compact binary signature of maximal size 13 bits is extracted from these different features for event characterization. The performance of the system is illustrated on different datasets of videos recorded on static cameras. The experiments show that the anomalies are well detected even if the method is not dedicated to one of the addressed scenarios." @default.
• W2290906593 created "2016-06-24" @default.
• W2290906593 creator A5061895505 @default.
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• W2290906593 date "2016-02-27" @default.
• W2290906593 modified "2023-10-17" @default.
• W2290906593 title "A modular system for global and local abnormal event detection and categorization in videos" @default.
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• W2290906593 doi "https://doi.org/10.1007/s00138-016-0752-z" @default.
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