First and Second Order Dynamics in a Hierarchical SOM system for Action Recognition

Zahra Gharaee, Peter Gärdenfors, Magnus Johnsson

Research output: Contribution to journalArticlepeer-review

13 Citations (SciVal)


Human recognition of the actions of other humans is very efficient and is based on patterns of movements. Our theoretical starting point is that the dynamics of the joint movements is important to action categorization. On the basis of this theory, we present a novel action recognition system that employs a hierarchy of Self-Organizing Maps together with a custom supervised neural network that learns to categorize actions. The system preprocesses the input from a Kinect like 3D camera to exploit the information not only about joint positions, but also their first and second order dynamics. We evaluate our system in two experiments with publicly available datasets, and compare its performance to the performance with less sophisticated preprocessing of the input. The results show that including the dynamics of the actions improves the performance. We also apply an attention mechanism that focuses on the parts of the body that are the most involved in performing the actions.
Original languageEnglish
Pages (from-to)574-585
JournalApplied Soft Computing
Publication statusPublished - 2017 Jun 4

Subject classification (UKÄ)

  • Computer Vision and Robotics (Autonomous Systems)


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