Gait measurement with 3-axes accelerometer/gyro in mobile devices
First Claim
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1. A method for real-time measurement of gait imperfection in a human subject, the method comprising:
- placing a mobile communication device against a lower back of said human subject, wherein the mobile communication device is equipped with a tri-axial accelerometer or a gyro;
measuring in real-time under a sampling frequency, by the mobile communication device, walking, heaving and lateral movements of said human subject, wherein the sample frequency is determined based on a movement pattern of the human subject;
constructing in real-time a signature of said subject based on movements measured by the mobile communication device;
wherein the signature is a three-dimensional trajectory in orthogonal directions of said subject'"'"'s center of gravity'"'"'s acceleration trajectory, the three-dimensional trajectory comprising direction and magnitude of acceleration components of the movements, and phase relationships between the acceleration components of the movements in different directions;
constructing in real-time a power level (Wij) dispensed by said subject to keep balance during motion quantitatively based on said signature by computing a summation of forces associated with individual segments along a trajectory of the center of gravity of said subject divided by a total measurement time; and
generating an output to indicate the gait imperfection in the human subject, wherein the generated output comprises the constructed signature and the constructed power level.
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Abstract
The present invention relates to a method of gait measurement using tri-axial accelerometer/gyro in mobile devices. In particular, the present invention relates to a method of gait measurement using tri-axial accelerometer/gyro in mobile devices for monitoring and improving the physical movement of a moving subject.
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15 Claims
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1. A method for real-time measurement of gait imperfection in a human subject, the method comprising:
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placing a mobile communication device against a lower back of said human subject, wherein the mobile communication device is equipped with a tri-axial accelerometer or a gyro; measuring in real-time under a sampling frequency, by the mobile communication device, walking, heaving and lateral movements of said human subject, wherein the sample frequency is determined based on a movement pattern of the human subject; constructing in real-time a signature of said subject based on movements measured by the mobile communication device; wherein the signature is a three-dimensional trajectory in orthogonal directions of said subject'"'"'s center of gravity'"'"'s acceleration trajectory, the three-dimensional trajectory comprising direction and magnitude of acceleration components of the movements, and phase relationships between the acceleration components of the movements in different directions; constructing in real-time a power level (Wij) dispensed by said subject to keep balance during motion quantitatively based on said signature by computing a summation of forces associated with individual segments along a trajectory of the center of gravity of said subject divided by a total measurement time; and generating an output to indicate the gait imperfection in the human subject, wherein the generated output comprises the constructed signature and the constructed power level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for real-time measurement of gait imperfection in a human subject comprising:
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a mobile communication device having a tri-axial accelerometer or a gyro placed against a lower back of said human subject and configured to measure in real-time under a sampling frequency walking, heaving and lateral movements of said human subject, wherein the sample frequency is determined based on a movement pattern of the human subject; a computer processor configured to; constructing in real-time a signature of said subject based on movements measured by the mobile communication device; wherein the signature is a three-dimensional trajectory in orthogonal directions of said human subject'"'"'s center of gravity'"'"'s acceleration trajectory, the three-dimensional trajectory comprising direction and magnitude of acceleration components of the movements, and phase relationship between the acceleration components of the movements in different directions; and constructing in real-time a power level dispensed by said human subject to keep balance during motion quantitatively based on said signature by computing a summation of forces associated with individual segments along a trajectory of the center of gravity of said human subject divided by a total measurement time; and generating an output to indicate the gait imperfection in the human subject, wherein the generated output comprises the constructed signature and the constructed power level.
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Specification