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. Author manuscript; available in PMC: 2015 Jul 15.
Published in final edited form as: J Neurosci Methods. 2013 Oct 1;231:22–30. doi: 10.1016/j.jneumeth.2013.09.015

Figure 1. Experimental protocol and analysis.

Figure 1

A) Subjects carried a mobile phone in their pocket, belt, hand, or bag and B) performed a predetermined sequence of activities. After performing one full sequence of activities, the subject moved the phone to the next phone location. C) Data processing pipeline. Accelerometer data was divided into clips that were two seconds long and features were calculated for each clip. The SVM used the features to make probabilistic estimates of the activity and/or location. These estimates were then smoothed over time using an HMM to predict the most likely activity and/or location.