Action Exemplar Based Real-Time Action Detection


Jung, S., Guo, Y., Sawhney, H., & Kumar, R., (2009). “Action exemplar based real-time action detection,” Computer Vision Workshops (ICCV Workshops), 2009 IEEE 12th International Conference on, vol., no., pp.498,505


We propose a real-time action detection system based on a novel action representation and an effective learning method with a small training set. We represent actions with a new feature that measures the global distance from a set of action exemplars, where action exemplars are constructed from a vocabulary that encodes local instantaneous body motions. A cascade of linear SVM is used to learn target actions, where at each layer a selective set of exemplars is chosen and variations between locally similar actions are trained in a coarse to fine manner. The method is further extended to incrementally learn a new action with a single example. The method is implemented as a real-time system that can detect actions at frame rate. The performance is extensively validated by evaluating on public and in-house action datasets.

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