Method and system for motion tracking
First Claim
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1. A method for motion tracking, comprising steps of:
- providing at least three accelerometers disposed on an object, the at least three accelerometers being provided with a relative position defined between neighboring accelerometers;
calculating a second position corresponding to each of the at least three accelerometers by extrapolation after a specific time period according to a first position corresponding to each of the at least three accelerometers and an acceleration value relative to the first position;
calibrating the second position according to the relative position defined between the neighboring accelerometers so that each of the accelerometers is provided with a calibrated position;
determining a transformation matrix according to the calibrated position and an initial position corresponding to each of the accelerometers; and
obtaining a rotational angle of the object according to the transformation matrix.
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Abstract
A method and a system for motion tracking, capable of tracking a trajectory of a movable object by an architecture having at least three accelerometers arranged in a predefined structure. The trajectory, displacement and rotational angle of the movable object are determined by ways of extrapolation, numerical calibration and vector transformation according to the acceleration signals detected by the at least three accelerometers.
10 Citations
15 Claims
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1. A method for motion tracking, comprising steps of:
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providing at least three accelerometers disposed on an object, the at least three accelerometers being provided with a relative position defined between neighboring accelerometers; calculating a second position corresponding to each of the at least three accelerometers by extrapolation after a specific time period according to a first position corresponding to each of the at least three accelerometers and an acceleration value relative to the first position; calibrating the second position according to the relative position defined between the neighboring accelerometers so that each of the accelerometers is provided with a calibrated position; determining a transformation matrix according to the calibrated position and an initial position corresponding to each of the accelerometers; and obtaining a rotational angle of the object according to the transformation matrix. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for motion tracking, comprising:
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at least three accelerometers disposed on a movable object and provided with a relative position defined between neighboring accelerometers, each of the accelerometers being provided with an acceleration signal according to the movable object; and a control unit electrically connected to the at least three accelerometers respectively so as to calculate a second position corresponding to each of the at least three accelerometers by extrapolation after a specific time period according to a first position corresponding to each of the at least three accelerometers and an acceleration signal relative to the first position, to calibrate the second position according to the relative position defined between the neighboring accelerometers so that each of the accelerometers is provided with a calibrated position, to determine a transformation matrix according to the calibrated position and an initial position corresponding to each of the accelerometers, and to obtain a rotational angle of the object according to the transformation matrix. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification