Spatio-temporal Semantic Features for Human Action Recognition

  • Liu, Jia (Institute of Image Processing and Pattern Recognition, Shanghai Jiao Tong University) ;
  • Wang, Xiaonian (Institute of Image Processing and Pattern Recognition, Shanghai Jiao Tong University) ;
  • Li, Tianyu (Institute of Image Processing and Pattern Recognition, Shanghai Jiao Tong University) ;
  • Yang, Jie (Institute of Image Processing and Pattern Recognition, Shanghai Jiao Tong University)
  • 투고 : 2012.07.04
  • 심사 : 2012.09.19
  • 발행 : 2012.10.31

초록

Most approaches to human action recognition is limited due to the use of simple action datasets under controlled environments or focus on excessively localized features without sufficiently exploring the spatio-temporal information. This paper proposed a framework for recognizing realistic human actions. Specifically, a new action representation is proposed based on computing a rich set of descriptors from keypoint trajectories. To obtain efficient and compact representations for actions, we develop a feature fusion method to combine spatial-temporal local motion descriptors by the movement of the camera which is detected by the distribution of spatio-temporal interest points in the clips. A new topic model called Markov Semantic Model is proposed for semantic feature selection which relies on the different kinds of dependencies between words produced by "syntactic " and "semantic" constraints. The informative features are selected collaboratively based on the different types of dependencies between words produced by short range and long range constraints. Building on the nonlinear SVMs, we validate this proposed hierarchical framework on several realistic action datasets.

키워드

참고문헌

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