Sensors 2012, 12(9), 12588-12605; doi:10.3390/s120912588

Comprehensive Context Recognizer Based on Multimodal Sensors in a Smartphone

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Received: 24 July 2012; in revised form: 10 September 2012 / Accepted: 13 September 2012 / Published: 17 September 2012
(This article belongs to the Special Issue Ubiquitous Sensing)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Recent developments in smartphones have increased the processing capabilities and equipped these devices with a number of built-in multimodal sensors, including accelerometers, gyroscopes, GPS interfaces, Wi-Fi access, and proximity sensors. Despite the fact that numerous studies have investigated the development of user-context aware applications using smartphones, these applications are currently only able to recognize simple contexts using a single type of sensor. Therefore, in this work, we introduce a comprehensive approach for context aware applications that utilizes the multimodal sensors in smartphones. The proposed system is not only able to recognize different kinds of contexts with high accuracy, but it is also able to optimize the power consumption since power-hungry sensors can be activated or deactivated at appropriate times. Additionally, the system is able to recognize activities wherever the smartphone is on a human’s body, even when the user is using the phone to make a phone call, manipulate applications, play games, or listen to music. Furthermore, we also present a novel feature selection algorithm for the accelerometer classification module. The proposed feature selection algorithm helps select good features and eliminates bad features, thereby improving the overall accuracy of the accelerometer classifier. Experimental results show that the proposed system can classify eight activities with an accuracy of 92.43%.
Keywords: context aware; smartphone; context recognition; accelerometer classification; audio classification; multimodal sensors
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MDPI and ACS Style

Han, M.; Vinh, L.T.; Lee, Y.-K.; Lee, S. Comprehensive Context Recognizer Based on Multimodal Sensors in a Smartphone. Sensors 2012, 12, 12588-12605.

AMA Style

Han M, Vinh LT, Lee Y-K, Lee S. Comprehensive Context Recognizer Based on Multimodal Sensors in a Smartphone. Sensors. 2012; 12(9):12588-12605.

Chicago/Turabian Style

Han, Manhyung; Vinh, La The; Lee, Young-Koo; Lee, Sungyoung. 2012. "Comprehensive Context Recognizer Based on Multimodal Sensors in a Smartphone." Sensors 12, no. 9: 12588-12605.

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