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Activity recognition in beach volleyball using a Deep Convolutional Neural Network

Leveraging the potential of Deep Learning in sports

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Abstract

Many injuries in sports are caused by overuse. These injuries are a major cause for reduced performance of professional and non-professional beach volleyball players. Monitoring of player actions could help identifying and understanding risk factors and prevent such injuries. Currently, time-consuming video examination is the only option for detailed player monitoring in beach volleyball. The lack of a reliable automatic monitoring system impedes investigations about the risk factors of overuse injuries. In this work, we present an unobtrusive automatic monitoring system for beach volleyball based on wearable sensors. We investigate the possibilities of Deep Learning in this context by designing a Deep Convolutional Neural Network for sensor-based activity classification. The performance of this new approach is compared to five common classification algorithms. With our Deep Convolutional Neural Network, we achieve a classification accuracy of 83.2%, thereby outperforming the other classification algorithms by 16.0%. Our results show that detailed player monitoring in beach volleyball using wearable sensors is feasible. The substantial performance margin between established methods and our Deep Neural Network indicates that Deep Learning has the potential to extend the boundaries of sensor-based activity recognition.

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Notes

  1. According to the sensor data sheet (Bosch Sensortec 2014a), the sampling rate of the acceleration sensors in low-power mode is 40 Hz. However, our tests showed, that the actual sampling rate was only approximately 39 Hz.

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Acknowledgements

We would like to thank Markus N. Streicher, Alexander Stolpe, Christoph Eckelmann, Adib Taraben and David Reck for their valuable suggestions and their contributions to the development of the sensor hardware as well as the recording and labeling of the data. Bjoern Eskofier gratefully acknowledges the support of the German Research Foundation (DFG) within the framework of the Heisenberg professorship programme (grant number ES 434/8-1).

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Correspondence to Thomas Kautz.

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Responsible editor: Johannes Fuernkranz.

Appendices

Appendix 1: Generic features

The following generic features were calculated for the classification with the NB, kNN, CART, SVM, RF and VOTE classifiers. The features with the highest ARI values that were used for the experiments with feature selection are printed in bold type.

  1. 1.

    standard deviation x-axis

  2. 2.

    standard deviation y-axis

  3. 3.

    standard deviation z-axis

  4. 4.

    mean x-axis

  5. 5.

    mean y-axis

  6. 6.

    mean z-axis

  7. 7.

    median x-axis

  8. 8.

    median y-axis

  9. 9.

    median z-axis

  10. 10.

    skewness x-axis

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    skewness y-axis

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    skewness z-axis

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    kurtosis x-axis

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    kurtosis y-axis

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    kurtosis z-axis

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    dominant frequency x-axis

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    dominant frequency y-axis

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    dominant frequency z-axis

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    amplitude of spectrum at dominant frequency x-axis

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    amplitude of spectrum at dominant frequency y-axis

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    amplitude of spectrum at dominant frequency z-axis

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    minimum x-axis

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    minimum y-axis

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    minimum z-axis

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    maximum x-axis

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    maximum y-axis

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    maximum z-axis

  28. 28.

    position of the maximum x-axis

  29. 29.

    position of the maximum y-axis

  30. 30.

    position of the maximum z-axis

  31. 31.

    position of the minimum x-axis

  32. 32.

    position of the minimum y-axis

  33. 33.

    position of the minimum z-axis

  34. 34.

    energy x-axis

  35. 35.

    energy y-axis

  36. 36.

    energy z-axis

  37. 37.

    correlation between x-axis and y-axis

  38. 38.

    correlation between x-axis and z-axis

  39. 39.

    correlation between y-axis and z-axis

Appendix 2: Classification accuracy

The performance of the compared classification approaches is summarized in Table 4.

Table 4 Sample accuracy (SAC) and balanced accuracy (BAC) for all compared classifiers with and without feature selection (%)

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Kautz, T., Groh, B.H., Hannink, J. et al. Activity recognition in beach volleyball using a Deep Convolutional Neural Network. Data Min Knowl Disc 31, 1678–1705 (2017). https://doi.org/10.1007/s10618-017-0495-0

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