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. 2015 Jul 31;15(8):18901–18933. doi: 10.3390/s150818901

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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graphic file with name sensors-15-18901-i001.jpg — Evolution of smartphone algorithms with respect to where they are carried: (a) assume the smartphone is firmly fastened to the body at a known location; (b) assume that the smartphone is located in the same area on the person’s body (whether it is held in the hand, placed in the chest or trouser pocket) throughout the day, but its orientation need not be fixed with respect to the body; (c) “state-of-the-art” algorithms are capable of identifying physical movement whether the device is held in the hand, or in a pocket of the individual’s clothing.

graphic file with name sensors-15-18901-i002.jpg — Evolution of smartphone algorithms with respect to where they are carried: (a) assume the smartphone is firmly fastened to the body at a known location; (b) assume that the smartphone is located in the same area on the person’s body (whether it is held in the hand, placed in the chest or trouser pocket) throughout the day, but its orientation need not be fixed with respect to the body; (c) “state-of-the-art” algorithms are capable of identifying physical movement whether the device is held in the hand, or in a pocket of the individual’s clothing.