Abstract
OpenHAR is a toolbox for Matlab to combine and unify 3D accelerometer data of ten publicly open data sets. This chapter introduces OpenHAR and provides initial experimental results based on it. Moreover, OpenHAR provides an easy access to these data sets by providing them in the same format, and in addition, units, measurement range, sampling rates, labels, and body position IDs are unified. Moreover, data sets have been visually inspected to fix visible errors, such as sensor in wrong orientation. For Matlab users OpenHAR provides code which user can use to easily select only desired parts of this data. This chapter also introduces OpenHAR to users without Matlab. For them, the whole OpenHAR data is provided as a one .txt-file. Altogether, OpenHAR contains over 280 h of accelerometer data from 211 study subjects performing 17 daily human activities and wearing sensors in 14 different body positions. This chapter shown the first experimental results based on OpenHAR data. The experiment was done using three classifiers: linear discriminant analysis (LDA), quadratic discriminant analysis (QDA), and classification and regression tree (CART). The experiment showed that using LDA and QDA classifiers and OpenHAR data, as high recognition rates can be achieved in a previously unseen test data than by using a data set specially collected for this purpose. With CART the results obtained using OpenHAR data were slightly lower.
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OpenHAR is available at: https://www.oulu.fi/bisg/datasets.
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Acknowledgements
The authors would like to thank Infotech Oulu for funding this work. In addition, the authors would like to thank the authors of Anguita et al. (2013), Banos et al. (2014), Chereshnev and Kertész-Farkas (2017), Micucci et al. (2017), Shoaib et al. (2014), Siirtola et al. (2012), Stisen et al. (2015), Sztyler and Stuckenschmidt (2016), Vavoulas et al. (2016), Zhang and Sawchuk (2012) for collecting and publishing the original data sets.
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Siirtola, P., Koskimäki, H., Röning, J. (2019). OpenHAR: A Matlab Toolbox for Easy Access to Publicly Open Human Activity Data Sets—Introduction and Experimental Results. In: Kawaguchi, N., Nishio, N., Roggen, D., Inoue, S., Pirttikangas, S., Van Laerhoven, K. (eds) Human Activity Sensing. Springer Series in Adaptive Environments. Springer, Cham. https://doi.org/10.1007/978-3-030-13001-5_9
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