METHOD OF DETECTING ACTIVITY WITH A MOTION SENSOR, AND CORRESPONDING DEVICE AND COMPUTER PROGRAM

摘要

This method for detecting activity (A) of a physical system carrying a motion sensor comprises the following steps: extracting (100) a sequence (M) of measurements provided by the motion sensor; deducing (102) therefrom an observation sequence (O) calculated on the basis of the measurement sequence (M); determining (104) the activity (A) of the physical system in the form of a sequence of states corresponding to the observation sequence, using a statistical model of components of the observation sequence in view of a plurality of possible predetermined states of the physical system. At least one component of the observation sequence (O) is calculated on the basis of a reference value ({circumflex over (λ)}) of a vector representing a reference axis. In addition, the method comprises the following calibration steps: calculation (106) of a likelihood value of the observation sequence (O) in view of said statistical model; comparison (106) of this likelihood value with a predetermined threshold; on the basis of this comparison, activating an estimation (108) of a new reference value ({circumflex over (λ)}) of the vector representing the reference axis.