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Article

Double-Windows-Based Motion Recognition in Multi-Floor Buildings Assisted by a Built-In Barometer

by 1, 1,2,*, 1, 1 and 1
1
Institute of Remote Sensing and GIS, Peking University, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, China
2
China Ship Research and Development Academy, No. 2, Shuangquanbao, Chaoyang District, Beijing 100101, China
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(4), 1061; https://doi.org/10.3390/s18041061
Received: 22 February 2018 / Revised: 29 March 2018 / Accepted: 29 March 2018 / Published: 1 April 2018
(This article belongs to the Special Issue Ubiquitous Massive Sensing Using Smartphones)
Accelerometers, gyroscopes and magnetometers in smartphones are often used to recognize human motions. Since it is difficult to distinguish between vertical motions and horizontal motions in the data provided by these built-in sensors, the vertical motion recognition accuracy is relatively low. The emergence of a built-in barometer in smartphones improves the accuracy of motion recognition in the vertical direction. However, there is a lack of quantitative analysis and modelling of the barometer signals, which is the basis of barometer’s application to motion recognition, and a problem of imbalanced data also exists. This work focuses on using the barometers inside smartphones for vertical motion recognition in multi-floor buildings through modelling and feature extraction of pressure signals. A novel double-windows pressure feature extraction method, which adopts two sliding time windows of different length, is proposed to balance recognition accuracy and response time. Then, a random forest classifier correlation rule is further designed to weaken the impact of imbalanced data on recognition accuracy. The results demonstrate that the recognition accuracy can reach 95.05% when pressure features and the improved random forest classifier are adopted. Specifically, the recognition accuracy of the stair and elevator motions is significantly improved with enhanced response time. The proposed approach proves effective and accurate, providing a robust strategy for increasing accuracy of vertical motions. View Full-Text
Keywords: motion recognition; barometer; double-windows; imbalanced data motion recognition; barometer; double-windows; imbalanced data
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MDPI and ACS Style

Liu, M.; Li, H.; Wang, Y.; Li, F.; Chen, X. Double-Windows-Based Motion Recognition in Multi-Floor Buildings Assisted by a Built-In Barometer. Sensors 2018, 18, 1061. https://doi.org/10.3390/s18041061

AMA Style

Liu M, Li H, Wang Y, Li F, Chen X. Double-Windows-Based Motion Recognition in Multi-Floor Buildings Assisted by a Built-In Barometer. Sensors. 2018; 18(4):1061. https://doi.org/10.3390/s18041061

Chicago/Turabian Style

Liu, Maolin, Huaiyu Li, Yuan Wang, Fei Li, and Xiuwan Chen. 2018. "Double-Windows-Based Motion Recognition in Multi-Floor Buildings Assisted by a Built-In Barometer" Sensors 18, no. 4: 1061. https://doi.org/10.3390/s18041061

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