Method of Temporal Segmentation of an Instrumented Gesture, Associated Device and Terminal

A device for temporal segmentation of an instrumented gesture in the course of execution by a user with the aid of a terminal equipped with an inertial navigation module, able to measure, during the execution of the gesture, a vector of inertial characteristics representative of a movement of said terminal, wherein the device comprises the following modules, implemented at each current instant:

• a module configured to calculate an instantaneous power value of said vector {right arrow over (V)}(tn)) at the current instant;
• a module configured to estimate of a gesture indicator (I(tn)) on the basis of a variation between said instantaneous power value and a mean power value estimated over a time window (F(t0,tn)) preceding the current instant;
• a module configured to determine first instant (tn1), termed start of gesture, corresponding to the current instant, when the estimated gesture indicator takes a value greater than or equal to a first predetermined threshold during a time interval greater than or equal to a first predetermined interval;
• a module configured to, subsequent to the detection of a start of gesture at the first current instant (tn1), determine a second instant (tn2), termed end of gesture when, at the current instant, the estimated gesture indicator takes a value less than or equal to a second predetermined threshold during a time interval greater than or equal to a second predetermined time interval.

A non-transitory computer-readable medium comprising a computer program recorded thereon and comprising instructions for implementation of a method of temporal segmentation of an instrumented gesture in the course of execution by a user with the aid of a terminal equipped with an inertial navigation module, able to measure, during the execution of the gesture, a vector of inertial characteristics {right arrow over (V)} representative of a movement of said terminal, when the instructions are executed by a processor, wherein the method comprises the following steps, implemented at each current instant (t0):

• calculation of an instantaneous power value (P(tn)) of said vector {right arrow over ((V)}(tn)) at the current instant;
• estimation of a gesture indicator I(tn)) on the basis of a variation between said instantaneous power value and a mean power value estimated over a time window (F[t0,tn]) preceding the current instant;
• determination of a first instant (tn1), termed start of gesture, corresponding to the current instant, when the estimated gesture indicator takes a value greater than or equal to a first predetermined threshold during a time interval greater than or equal to a first predetermined interval;
• subsequent to the detection of a start of gesture at the first current instant (tn1), determination of a second instant (tn2), termed end of gesture when, at the current instant, the estimated gesture indicator takes a value less than or equal to a second predetermined threshold during a time interval greater than or equal to a second predetermined time interval.