From Raw SensFloor Signal to Walking Trajectories
Résumé
A capacitive proximity capture device SensFloor(1) was installed in the HUman at home
projecT(2) apartment in Montpellier, South of France. Activations related to participants’
movements were continuously captured and recorded by this smart floor. This low-cost Floor
present the issue of spatial precision of collected signals. Actually, the least spatial element
is a triangle of 25x50 cm. Moreover, the activation signal is a capacitive one that is not
proportional to the weight of the object. As a consequence, it is challenging to organize this
space-temporal signals into human behavioral events such as static position, trample, walk,
alone or more persons into the apartment and so on. These events will be in the foundation
of defining Human@Home metrics. Trajectories were detected, identified and reconstructed
by the Walk@Home algorithm(3). In the core of this algorithm is a space-temporal window
that scans the raw signals and organize them into a dynamic graph containing the eventual
trajectories. Even then, the result is an approximation of the movement of the center of the
gravity of a human.