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Extra info for ECAI 2008: Proceedings, 18th European Conference on Artificial Intelligence, July 21-25, 2008, Patras, Greece : Including Prestigious Applications of Intelligent ... in Artifical Intelligence and Applications)

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Br´emond, S. Hongeng, and G. Nevatia, ‘Activity Analysis in Video’, Pattern Analysis and Machine Intelligence PAMI, 23(8), 873–889, (2001). [7] N. Moenne-Loccoz, F. Br´emond, and M. Thonnat, ‘Recurrent bayesian network for the recognation of human behaviors from video’, in Third International Conference On Computer Vision Systems (ICVS 2003), volume LNCS 2626, pp. 44–53, Graz, Austria, (2003). Springer. [8] A. Toshev, F. Br´emond, and M. Thonnat, ‘An a priori-based method for frequent composite event discovery in videos’, in Proceedings of 2006 IEEE International Conference on Computer Vision Systems, New York USA, (January 2006).

For instance the scenes shown in figures 1 and 2 can be interpreted more or less precisely in function of the a priori knowledge of the observer. fr Figure 1. A scene with different valid interpretations: two people walking together towards a door or a bank attack with an access to a forbidden area by an unauthorized person and an employee. Figure 2. A scene with different valid interpretations: a person standing in a room or an active elderly preparing a meal in a kitchen. 2 4D APPROACH We present a cognitive vision approach mixing 4D computer vision techniques and activity recognition based on a priori knowledge.

Blanchard et al. / A Generic Framework for Comparing Semantic Similarities on a Subsumption Hierarchy and the Cauchy’s mean [5] of the cardinalities of the respective sets |A| and |B|: σα (A, B) = fα (|A| , |B| , |A ∩ B|) = |A∩B| μα (|A|,|B|) (1) ”1 “ α α α where μα (|A| , |B|) = |A| +|B| for α ∈ IR. 2 Note that the case α = 1 concides with the classical arithmetic mean. The second family σβ has been studied by Gower and Legendre [10]: σβ (ci , cj ) = fβ (|A| , |B| , |A ∩ B|) = β·|A∩B| |A|+|B|+(β−2)·|A∩B| Table 1.

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