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Multimedia Tools and Applications

, Volume 77, Issue 10, pp 12073–12094 | Cite as

Effective and efficient similarity searching in motion capture data

  • Jan SedmidubskyEmail author
  • Petr Elias
  • Pavel Zezula
Article

Abstract

Motion capture data describe human movements in the form of spatio-temporal trajectories of skeleton joints. Intelligent management of such complex data is a challenging task for computers which requires an effective concept of motion similarity. However, evaluating the pair-wise similarity is a difficult problem as a single action can be performed by various actors in different ways, speeds or starting positions. Recent methods usually model the motion similarity by comparing customized features using distance-based functions or specialized machine-learning classifiers. By combining both these approaches, we transform the problem of comparing motions of variable sizes into the problem of comparing fixed-size vectors. Specifically, each rather-short motion is encoded into a compact visual representation from which a highly descriptive 4,096-dimensional feature vector is extracted using a fine-tuned deep convolutional neural network. The advantage is that the fixed-size features are compared by the Euclidean distance which enables efficient motion indexing by any metric-based index structure. Another advantage of the proposed approach is its tolerance towards an imprecise action segmentation, the variance in movement speed, and a lower data quality. All these properties together bring new possibilities for effective and efficient large-scale retrieval.

Keywords

Motion capture data retrieval Effective similarity measure Efficient indexing k-NN query Motion image Convolutional neural network Fixed-size motion feature 

Notes

Acknowledgements

This research was supported by GBP103/12/G084.

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  1. 1.Masaryk UniversityBrnoCzech Republic

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