Human Activities and Postures Recognition: From Inertial Measurements to Quaternion-Based Approaches.

This paper presents two approaches to assess the effect of the number of inertial sensors and their location placements on recognition of human postures and activities. Inertial and Magnetic Measurement Units (IMMUs)-which consist of a triad of three-axis accelerometer, three-axis gyroscope, and three-axis magnetometer sensors-are used in this work. Five IMMUs are initially used and attached to different body segments.