Sensors 2014, 14(9), 15861-15879; doi:10.3390/s140915861
Article

Evaluation of Prompted Annotation of Activity Data Recorded from a Smart Phone

1,* email, 2email, 1email, 2email, 3email, 1email and 2email
Received: 15 April 2014; in revised form: 31 July 2014 / Accepted: 5 August 2014 / Published: 27 August 2014
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: In this paper we discuss the design and evaluation of a mobile based tool to collect activity data on a large scale. The current approach, based on an existing activity recognition module, recognizes class transitions from a set of specific activities (for example walking and running) to the standing still activity. Once this transition is detected the system prompts the user to provide a label for their previous activity. This label, along with the raw sensor data, is then stored locally prior to being uploaded to cloud storage. The system was evaluated by ten users. Three evaluation protocols were used, including a structured, semi-structured and free living protocol. Results indicate that the mobile application could be used to allow the user to provide accurate ground truth labels for their activity data. Similarities of up to 100% where observed when comparing the user prompted labels and those from an observer during structured lab based experiments. Further work will examine data segmentation and personalization issues in order to refine the system.
Keywords: activity recognition; ground truth acquisition; experience sampling; accelerometry; big data; mobile sensing; participatory sensing; opportunistic sensing
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MDPI and ACS Style

Cleland, I.; Han, M.; Nugent, C.; Lee, H.; McClean, S.; Zhang, S.; Lee, S. Evaluation of Prompted Annotation of Activity Data Recorded from a Smart Phone. Sensors 2014, 14, 15861-15879.

AMA Style

Cleland I, Han M, Nugent C, Lee H, McClean S, Zhang S, Lee S. Evaluation of Prompted Annotation of Activity Data Recorded from a Smart Phone. Sensors. 2014; 14(9):15861-15879.

Chicago/Turabian Style

Cleland, Ian; Han, Manhyung; Nugent, Chris; Lee, Hosung; McClean, Sally; Zhang, Shuai; Lee, Sungyoung. 2014. "Evaluation of Prompted Annotation of Activity Data Recorded from a Smart Phone." Sensors 14, no. 9: 15861-15879.

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