Abstract: A method for analyzing the game of a user of a racket (Ra) includes detecting an impact on the racket (Ra) from representative measurements of a shock to the racket (Ra) provided by a sensor assembly comprising at least one sensor sensitive to shocks linked to the racket (Ra) in a fixed manner in terms of movement. A moment of impact is associated with a detected impact, from the measurements transmitted by the sensor assembly. The impacts that are not related to strokes from a set of pre-determined strokes are eliminated on the basis of angular rotational velocity measurements, provided by a gyrometer (G) of the sensor assembly with at least one measurement axis and linked to the racket (Ra) in a fixed manner in terms of movement, taken during an interval of time around said moment of impact.

Abstract: The present invention relates to a method for measuring the angular position of a contrasting edge of an object having a luminance transition zone which is substantially rectilinear in a given direction and separates two regions of different luminances. This method comprises the functional steps of: —carrying out, in a transverse direction different from the given direction, an amplitude modulation of the signals delivered by a first and a second optical sensor; and —calculating an output signal (Yout(t)) starting from the signals delivered by the first and the second optical sensors (D1, D2) as a function of the angular position of the luminance transition zone. Device and set of devices for measuring the angular position of a contrasting edge and steering aid system for fixation and tracking a target comprising at least one such contrasting edge.

Abstract: A method for analyzing the game of a user of a racket (Ra) includes detecting an impact from representative measurements of a shock to the racket (Ra) provided by a sensor assembly. The sensor assembly includes at least one sensor sensitive to shocks and is connected to the racket (Ra). A moment of impact is associated with a detected impact, using the measurements transmitted by the sensor assembly. Impacts that are not related to strokes from a set of pre-determined strokes are eliminated on the basis of angular rotational velocity measurements, provided by a gyrometer (G) of the sensor assembly with at least one measurement axis and linked to the racket, taken during an interval of time around the moment of impact.

Abstract: The present invention relates to a method for measuring a time delay between two output signals measured by two adjacent optical sensors, the time delay resulting from a movement of an object moving in a given direction. The method comprises the steps: carrying out a spatial filtering of the signals Ph1 and Ph2 delivered by a first and a second optical sensor; calculating a first order derivative and carrying out a temporal low-pass filtering of the signals; calculating the second order derivative of the signals; measuring the delay between the signals; and is characterized in that the step of measuring the delay is a feedback loop based on an estimated delay between the temporally filtered signals. Device and set of devices for measuring the angular velocity of a luminance transition zone and steering aid system for fixation and tracking a target comprising at least one such luminance transition zone.

Abstract: The present invention relates to a method for measuring a time delay between two output signals measured by two adjacent optical sensors, the time delay resulting from a movement of an object moving in a given direction. The method comprises the steps: carrying out a spatial filtering of the signals Ph1 and Ph2 delivered by a first and a second optical sensor; calculating a first order derivative and carrying out a temporal low-pass filtering of the signals; calculating the second order derivative of the signals; measuring the delay between the signals; and is characterized in that the step of measuring the delay is a feedback loop based on an estimated delay between the temporally filtered signals. Device and set of devices for measuring the angular velocity of a luminance transition zone and steering aid system for fixation and tracking a target comprising at least one such luminance transition zone.

Abstract: The present invention relates to a method for measuring the angular position of a contrasting edge of an object having a luminance transition zone which is substantially rectilinear in a given direction and separates two regions of different luminances. This method comprises the functional steps of: —carrying out, in a transverse direction different from the given direction, an amplitude modulation of the signals delivered by a first and a second optical sensor; and —calculating an output signal (Yout(t)) starting from the signals delivered by the first and the second optical sensors (D1, D2) as a function of the angular position of the luminance transition zone. Device and set of devices for measuring the angular position of a contrasting edge and steering aid system for fixation and tracking a target comprising at least one such contrasting edge.