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In this paper, we describe a 3D mobile demonstration platform that can passively track the location and posture of multiple persons walking on a segmented floor. The presented tracking system is fully unobtrusive and requires the user to neither wear any tags or perform any special action, such as talk, to be tracked. Thus, it promotes the concept of calm technology by pushing the sensing actions to the background. The system is based on capacitive measurements in transmit-mode which are performed using a commercial capacitance-to-digital converter. The user position on the floor level is calculated by measuring the placement of feet on different transmitting floor segments. The vertical head position is measured using a large receiver electrode placed above the tracking area and the result is used to determine the user posture. The implemented system is provided for hands-on evaluation for conference attendees with a 1.8x3.0 m floor space which enables the tracking of five persons at the same time. The position and the three-state posture of the persons walking on the floor are displayed to the demo attendees in real-time. |
