DEVICE AND METHOD FOR CHARACTERIZING MOVEMENTS
First Claim
1. A device for characterizing movements of an object comprising at least one accelerometer fastened to said object and a computation module, said computation module being capable of using the outputs of said at least one accelerometer to execute:
- at least one function for segmenting said movements into individual movements between a first position and a second position, andfor each individual movement, at least one function for determining the direction and the line of displacement of said individual movement relative to at least one axis linked to the object.
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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.
29 Citations
20 Claims
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1. A device for characterizing movements of an object comprising at least one accelerometer fastened to said object and a computation module, said computation module being capable of using the outputs of said at least one accelerometer to execute:
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at least one function for segmenting said movements into individual movements between a first position and a second position, and for each individual movement, at least one function for determining the direction and the line of displacement of said individual movement relative to at least one axis linked to the object. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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- 8. A method for characterizing movements of an object comprising at least one step for capturing the output signals from at least one accelerometer fastened to said object and a step for calculation by a processor, in which method, during said calculation step, the outputs from the step for capturing the output signals from at least one accelerometer are used to execute at least one function for segmenting said movements into individual movements between a first position and a second position, and, for each individual movement, at least one function for determining the direction and the line of displacement of said individual movement relative to at least one axis linked to the object.
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20. System for evaluating the movements of an object comprising:
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A master scenario of reference movements to be executed by said object, A control interface of said reference movements of said object, At least one first uniform field sensor, said sensor being fastened to said object, A calculation module, said module being capable to execute from the output of said first sensor; at least one function for segmenting said movements into individual movements between a first position and a second position, and for each individual movement, at least one function for determining the direction and the line of displacement of said individual movement relative to at least one axis linked to the object, said movements of said object being executed in response to said reference movements.
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Specification