Commissariat a L'energie Atomique Et Aux Energies Alternatives

Commissariat a L'energie Atomique

Movea

Université Joseph Fourier

Institut National Polytechnique De Grenoble

Université Grenoble Alpes

Commissariat a L'energie Atomique Et Aux Energies

Movea Sa

Christelle Godin

Suzanne Lesecq

Yanis Caritu

Joe Youssef

Bruno Flament

Dominique David

Etienne De Foras

Saifeddine Aloui

Pierre Grenet

Mathieu Grossard

Benoit Denis

Stephane Bonnet

Benoît Denis

Stéphane Bonnet

Cyrille Soubeyrat

Nathalie Sprynski

Sébastien Riccardi

Alain Barraud

Florian De Boissieu

Sébastien Dauve

Grégoire Aujay

Anthony Larue

Aurélien Mayoue

Stèphane Bonnet

Aurélie Campagne

Gaël Vila

Sylvie Charbonnier

Loris Olmos

Clément Rolinat

Erik Simon Ollander

François Favre-Reguillon

A method for determining a membership function, the membership functions allowing a stress level of a user to be determined on the basis of a physiological parameter measured on the user, the membership function varying, depending on the physiological parameter, between:

Method for determining a membership function, intended to be applied to estimate a stressed state of a person

Parameters characterizing the orientation and the position of each sensor, including at least one accelerometer, are evaluated in the reference frame of each segment, together with the length of each segment, by using predetermined configurations and motions of a structure to which the sensors are attached. This makes it possible to provide a device for capturing the motions of a body with measurements which enables greater reliability of the measurements.

Method of identifying geometric parameters of an articulated structure and of a set of reference frames of interest disposed on said structure

A method for estimating a path of a moving element or body using a sensor assembly includes: receiving acceleration values provided by an accelerometer; receiving angular velocity values provided by a gyrometer; processing the values provided for estimating at least one angular position value using the angular velocity values and at least two Cartesian position values defining a path of the moving element or body using acceleration values and the at least one previously estimated angular position value; estimating rotation parameters, by inverting a rotational realignment model of the estimated path subject to prior knowledge of the path; retroactively correcting the at least one estimated angular position value, by applying a rotation on this value using estimated rotation parameters, so as to provide at least one corrected angular position value.

Method and system for estimating a path of a mobile element or body

A method determining values of parameters representing a movement of an entity represented by an articulated chain, by a sensor assembly including at least one sensor for a parameter representing an orientation of a first segment of the articulated chain, the method including: reception of an orientation value measured and supplied by the orientation sensor; estimation of a value of at least one first parameter representing a movement of the first segment by processing the orientation value; and, based on a predetermined movement model of the articulated chain, as a time change model, including at least one relationship of time dependency between the at least one first parameter and at least one other parameter representing a movement of another segment of the articulated chain: estimation of a value of the at least one other parameter by application of the time change model to the estimated value of the at least one first parameter.

Method and system for determining the values of parameters representative of a movement of at least two limbs of an entity represented in the form of an articulated line

A method for estimating a roughness R of a surface is provided, including: measuring, during relative movement of at least one force sensor in a direction roughly parallel to the surface, at least one force Fperceived by the at least one force sensor in a direction which is roughly orthogonal to said direction of movement, and parallel to said surface; calculating at least one statistical parameter P representative of variations of the value of the measured at least one force F; and estimating the roughness R by calculating R=f(P), where f(P) is a function of the at least one statistical parameter P having at least some coefficients with values that are dependent on characteristics of the at least one force sensor used, and on a force with which the at least one force sensor is applied on said surface during the relative movement.

Method for estimating a roughness of a surface

A system for counting a basic displacement of a person includes a housing (BT) and a fixing device (EF) for securely mounting the housing (BT) on the person. Within the housing are a magnetometer for measuring the direction of the terrestrial magnetic field in the reference frame of the housing, a device for determining a quantity representative of the inclination of the measured magnetic field with respect to the vertical, and a device for detecting a change of orientation of an orthogonal projection of the direction of the terrestrial magnetic field in a horizontal planar reference frame having axes of constant directions and tied in translation to the person, on the basis of the measured direction of the magnetic field and of the quantity representative of the inclination of the magnetic field with respect to the vertical.

System and method for counting the changes in direction of a person

A tactile surface texture method including: measuring at least one force perceived by a force sensor during a relative movement of the sensor with respect to a surface to be characterized; calculating one or more time and/or frequency parameters of an output signal transmitted by the sensor representative of the previously measured force; determining a value of a tactile descriptor of multiple tactile descriptors through application of a continuous transfer function to the previously calculated parameters, the transfer function being previously determined by regression from a learning database associating, for each descriptor, plural values of the tactile descriptor with plural values of one or more time and/or frequency parameters calculated from measurements made by the force sensor on multiple test surfaces representative of values of the tactile descriptor in question.

Tactile surface texture characterisation method

Device for determining a characteristic of a trajectory formed of successive positions of a triaxial accelerometer (A) rigidly tied to a mobile element (EM), between a first instant of immobility (t) and a second instant of immobility (t) of the triaxial accelerometer (A), subsequent to said first instant of immobility (t), said device comprising, furthermore, a triaxial additional sensor for measuring a vector of a substantially constant vector field between said first and second instants of immobility (t,t), in a fixed global reference frame (GE) tied to the terrestrial reference frame, said additional sensor being rigidly tied to said mobile element (EM) and fixed in the reference frame of the accelerometer (A), and control means (CMD).

Device and method for determining a characteristic of a path formed by consecutive positions of a triaxial accelerometer rigidly connected to a mobile element

The invention relates to an autonomous system for determining items of information representative of the movement of an articulated chain (CACACA) comprising at least two solid elements (ESESESESESESESESES) and at least one articulation (ARTARTARTARTARTART) connecting said two elements. The system comprises at least two devices (DISPDISPDISPDISPDISPDISPDISPDISPDISP) for measuring inter-device distances, mounted fixedly on two distinct elements of said articulated chain and suitable for transmitting the measurements made. Moreover, the system comprises means for determining at least one distance separating two measuring devices based on at least one measurement supplied by a measuring device, and calculation means (CALC), mounted on said articulated chain, suitable for calculating items of information representative of the movement of said articulated chain based on the measurements transmitted by said devices for measuring inter-device distances.

Autonomous system and method for determining information representative of the movement of an articulated chain

A classification method including first classifying an event of any kind by first rules, and then second classifying events, not identified by the first classification, by a learning base reinforced with all the events identified by the first classification. The method is adaptive if the second classification rules are amended according to new examples that were able to be determined by the first rules.

Method for identifying a person's posture

This method uses two sets of sensors to estimate certain characteristics of the movement of a device or a person or states, especially postures, they adopt. A first, abundant, set of sensors () is removed after a learning phase where it records with certainty the states obtained by interpreting first decisional rules. The measurements of a second set of sensors (), much more restricted than the first, are correlated to the states reached during the learning period by second decisional rules automatically obtained by supplying a classifier. They are then interpreted to determine the new states reached by the wearer just by means of the second sensors. The results are good in spite of the low number of second sensors, thanks to the accuracy of the second decisional rules.

Method and device for the recognition of the position or movement of a device or a person

The invention concerns a device for capturing the motion of a structure consisting of N articulated segments, characterized in that it comprises: Application to biomechanical analysis, telemanipulation, animation of characters, etc.

Motion capture device and associated method

A method for detecting a substantially invariant rotation axis of a motion of a mobile body equipped with at least one inertial or magnetic sensor with three sensitive axes that includes acquiring physical measurements with respect to the three sensitive axes of the sensor, the physical measurements including at least three samples at different times, estimating a substantially invariant rotation axis in the physical measurements space, and identifying the estimated axis as the substantially invariant rotation axis of the motion. In one aspect, the method is applicable for estimating the motion of a mobile body rotating about a substantially invariant axis.

Method and device for detecting a substantially invariant rotation axis

The method estimates movement of a solid mobile in a medium capable of generating disturbances defined by a three-variable vector, wherein the movement is defined by a six-variable vector and the solid is equipped with at least one sensor sensitive to acceleration having at least three sensitive axes and at least one sensor sensitive to the magnetic field having at least three sensitive axes. The method for estimating the movement of a solid includes a step of calculating a nine-variable vector consisting of the six-variable movement vector and of the three-variable disturbance vector and a step of weighting the nine-variable vector capable of transforming the nine-variable vector into a vector with not more than five variables to be estimated.

Growing community of inventors

Brignoud, France

Christelle Godin