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Independent Viewpoint Silhouette-based Human Action Modelling and Recognition

Abstract : This paper addresses the problem of silhouette-based human action modelling and recognition independently of the camera point of view. Action recognition is carried out by comparing a 2D motion template, built from observations, with learned models of the same type captured from a wide range of viewpoints. All these 2D motion templates, are projected into a new subspace by means of the Kohonen Self Organizing feature Map (SOM). A specific SOM is trained for every action, grouping viewpoint (spatial) and movement (temporal) in a principal manifold. This approach enables the interpolation of data ”between different viewpoints” and, at the same time, to establish motion correspondences between viewpoints without considering a mapping to a complex 3D model. Every new 2D motion template gives a distance to the map, related to the probability that motion feature belongs to that particular action. Action recognition is accomplished by a Maximum Likelihood (ML) classifier over all specific-action SOMs. We demonstrate this approach on two challenging video sets: one based on real actors making 11 complex actions and another one based on virtual actors performing 20 different actions.
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Submitted on : Sunday, October 5, 2008 - 12:31:39 PM
Last modification on : Monday, October 6, 2008 - 9:43:19 AM
Long-term archiving on: : Friday, June 4, 2010 - 12:12:35 PM


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  • HAL Id : inria-00326715, version 1



Carlos Orrite, Francisco Martínez, Elías Herrero, Hossein Ragheb, Sergio Velastin. Independent Viewpoint Silhouette-based Human Action Modelling and Recognition. The 1st International Workshop on Machine Learning for Vision-based Motion Analysis - MLVMA'08, Oct 2008, Marseille, France. ⟨inria-00326715⟩



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