Fig. 2From: User activity recognition system to improve the performance of environmental control interfaces: a pilot study with patientsEnvironment Control Interface. The ECI had three different abstraction levels: 1) related with the room, 2) related to the activities that can be performed in a specific room and 3) related to the actions regarding a specific activity. An example menu of each level is shown in (a), (b) and (c) respectivelyBack to article page