“…In literature, several technological approaches have been proposed to recognize human activities [ 1 , 2 , 3 , 4 ]. These activities can be divided into two types: simple activities (i.e., walking, running, climbing stairs, moving arms) and complex (or long-term) activities (which include several simple activities—for example, cooking—that could be comprised of walking and moving one’s arms [ 5 , 6 ]). Most of the approaches that have been proposed are characterized by sensors involved that must be carried by subjects (accelerometers, microphones, gyroscopes, biosensors, plantar pressure sensors, Radio Frequency Identification (RFID) tags, among others [ 7 , 8 , 9 , 10 , 11 ]), as well as devices embedded in their environment such as camcorders [ 12 , 13 , 14 ].…”