Abstract: Systems and methods for recognizing the gestures of an entity, notably a human being, and, optionally, for controlling an electrical or electronic system or apparatus, are discussed. The system uses sensors that measure signals, preferentially representative of inertial data about the movements of said entity, and implements a process for enriching a dictionary of said gestures to be recognized and a recognition algorithm, for recognition among the classes of gestures in said dictionary. The algorithm implemented is preferably of the dynamic time warping type. The system carries out preprocessing operations, such as the elimination of signals captured during periods of inactivity of the entity, subsampling of the signals, and normalization of the measurements by reduction, and preferentially uses, to classify the gestures, specific distance calculation modes and modes for merging or voting between the various measurements by the sensors.

Abstract: The invention proposes a device and a method for characterizing movements performed by an object, notably a limb of a human being instrumented with at least one accelerometer. The invention is particularly useful for determining the direction, the line and the length of the steps of said human being. The invention uses algorithms for processing the signals from the sensor to make it possible to segment the steps by identifying the lifting and the landing of said limb by comparing the signals output from the sensor with thresholds, to determine the direction and the line of the step by comparing the maxima of the values of the signals along two axes substantially parallel to the walking plane and to calculate the length of the step by double integration of the signals according to the direction of the step. The invention is also applicable to hand movements that have trend characteristics similar to those of the steps.

Abstract: The system for determining parameters representing the orientation of a solid in movement subject to a first vector field and a second vector field—comprises a first triaxial sensor and a second triaxial sensor integral to said solid for measuring the components of said respective vector fields along the axes of said sensors, and means for determining the rotation matrix of the solid. Said means for determining said rotation matrix comprise: correction means for correcting the influence of an additional vector field of the same nature as said measured vector field; and first means for calculating a third vector which is not coplanar to the plane formed by the two vectors delivered by said correction means, and such that the angles of the axis system formed by the third vector and the two vectors delivered by said correction means remain constant.