“…Although the performance of these approaches may be lower than KSS ones because they depend on the angle of vision of the camera [14], they can operate automatically, being a non-intrusive approach whilst providing privacy, if the system has the ability to decide whether or not to stream the video [20,21]. Moreover, vision-based systems offer many interesting research applications in this field, and the use of the Kinect-like cameras provides a step forward in telerehabilitation and telecare, allowing patients to be remote and automatically assisted in their particular therapies or attention [7,8,22,23,24,25,26]. …”