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September 2017

Learning to judge like a human: convolutional networks for classification of ski jumping errors

  • H. Brock, Y. Ohgi, J. Lee,
  • in Proceedings of the 2017 ACM International Symposium on Wearable Computers,
  • vol. 1,
  • no. 1,
  • ACM,
  • 2017,
  • pp. 106-113,
  • Conference paper

Advanced machine learning technologies are seldom applied to wearable motion sensor data obtained from sport movements. In this work, we therefore investigated neural networks for motion performance evaluation utilizing a set of inertial sensor-based ski jump measurements. A multi-dimensional convolutional network model that related the motion data under aspects of time, placement and sensor type was implemented. Additionally, its applicability as a measure for automatic motion style judging was evaluated. Results indicate that one multi-dimensional convolutional layer is sufficient to recognize relevant performance error representations. Furthermore, comparisons against a Support Vector Machine and a Hidden Markov Model show that the new model out-performs feature-based methods under noisy and biased data environments. Architectures such as the proposed evaluation system can hence become essential for automatic performance analysis and style judging systems in future.

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