Representing Activities With Layers Of Velocity Statistics For Multiple Human Action Recognition In Surveillance Applications
VIDEO SURVEILLANCE AND TRANSPORTATION IMAGING APPLICATIONS 2014(2014)
摘要
A novel action recognition strategy in a video-surveillance context is herein presented. The method starts by computing a multiscale dense optical flow, from which spatial apparent movement regions are clustered as Regions of Interest (RoIs). Each ROI is summarized at each time by an orientation histogram. Then, a multilayer structure dynamically stores the orientation histograms associated to any of the found RoI in the scene and a set of cumulated temporal statistics is used to label that RoI using a previously trained support vector machine model. The method is evaluated using classic human action and public surveillance datasets, with two different tasks: (1) classification of short sequences containing individual actions, and (2) Frame-level recognition of human action in long sequences containing simultaneous actions. The accuracy measurements are: 96.7% (sequence rate) for the classification task, and 95.3% (frame rate) for recognition in surveillance scenes.
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关键词
Action recognition, optical flow, Motion descriptors, video-surveillance
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