System and method of biomechanical posture detection and feedback
A system and method are described herein for a sensor device which biomechanically detects in real-time a user's movement state and posture and then provides real-time feedback to the user based on the user's real-time posture. The feedback is provided through immediate sensory feedback through the sensor device (e.g., a sound or vibration) as well as through an avatar within an associated application with which the sensor device communicates.
1. A method of providing postural feedback comprising:
receiving by a microprocessor at repeated intervals data from a tri-axial accelerometer, the microprocessor and the tri-axial accelerometer comprising a sensor device attached to a user, the sensor device further comprising memory, an actuator, and a power source;
normalizing by the microprocessor the received accelerometer data;
determining by the microprocessor a postural description of the user based on the normalized received accelerometer data, wherein determining the postural description of the user comprises:
computing feature vectors for the normalized received accelerometer data;
quantizing the feature vectors;
assigning the feature vectors to Gaussian distributions;
acquiring distribution histograms for the multiple movement states; and
comparing the distribution histograms to determine in which movement state, of a set of multiple movement states, the user is currently in; and
determining a current posture quality of the user indicating how well the user is balanced within the determined current movement state of the user;
and
triggering by the microprocessor the actuator to output sensory feedback based on the postural description of the user.
2. The method of claim 1 wherein determining the postural description based on the normalized received accelerometer data comprises calculating a pelvic tilt angle of the user.
3. The method of claim 1 wherein a rule-based model is used to determine the postural description of the user based on the normalized received accelerometer data.
4. The method of claim 1 wherein a statistical model is used to determine the postural description of the user based on the normalized received accelerometer data.
5. The method of claim 1 wherein a library comparison model is used to determine the postural description of the user based on the normalized received accelerometer data.
6. The method of claim 1 wherein a pelvic tilt angle model is used to determine the postural description of the user based on the normalized received accelerometer data.
7. A method of providing postural feedback comprising:
receiving by a microprocessor at repeated intervals data from a tri-axial accelerometer, the microprocessor and the tri-axial accelerometer comprising a sensor device attached to a user, the sensor device further comprising memory, an actuator, and a power source;
normalizing by the microprocessor the received accelerometer data;
determining by the microprocessor a postural description of the user based on the normalized received accelerometer data, wherein determining the postural description of the user comprises:
determining in which movement state, of a set of multiple movement states, the user is currently in; and
determining a current posture quality of the user indicating how well the user is balanced within the determined current movement state of the user;
triggering by the microprocessor the actuator to output sensory feedback based on the postural description of the user;
and
transmitting across a wireless electronic communication connection to a computing device the postural description of the user and the normalized received accelerometer data.
8. A postural feedback apparatus comprising:
a sensor device configured to be attached on a user, the sensor device comprising:
a tri-axial accelerometer;
an actuator; and
a microprocessor configured to
receive data from the tri-axial accelerometer about movement of the user;
normalize the received accelerometer data;
determine a postural description of the user based on the normalized received accelerometer data, wherein the postural description of the user comprises a current movement state of the user, of a set of multiple movement states, and a current posture quality of the user indicating how well the user is balanced within the current movement state of the user,
wherein the microprocessor configured to determine the postural description of the user based on the normalized received accelerometer data comprises the microprocessor configured to:
compute feature vectors for the normalized received accelerometer data;
quantize the feature vectors;
assign the feature vectors to Gaussian distributions;
acquire estimated distribution histograms for the multiple movement states; and
compare the distribution histograms to determine the current movement state from the multiple movement states;
and
trigger the actuator to output sensory feedback based on the postural description of the user.
9. The apparatus of claim 8 wherein the microprocessor configured to determine the postural description of the user based on the normalized received accelerometer data uses a rule-based model.
10. The apparatus of claim 8 wherein the microprocessor configured to determine the postural description of the user based on the normalized received accelerometer data uses a statistical model.
11. The apparatus of claim 8 wherein the microprocessor configured to determine the postural description of the user based on the normalized received accelerometer data uses a library comparison model.
12. The apparatus of claim 8 wherein the microprocessor configured to determine the postural description of the user based on the normalized received accelerometer data uses a pelvic tilt angle model.
13. A postural feedback apparatus comprising:
a sensor device configured to be attached on a user, the sensor device comprising:
a tri-axial accelerometer;
an actuator;
a wireless communication module;
and
a microprocessor configured to
receive data from the tri-axial accelerometer about movement of the user;
normalize the received accelerometer data;
determine a postural description of the user based on the normalized received accelerometer data, wherein the postural description of the user comprises a current movement state of the user, of a set of multiple movement states, and a current posture quality of the user indicating how well the user is balanced within the current movement state of the user; and
trigger the actuator to output sensory feedback based on the postural description of the user;
and
communicate with the wireless communication module to transmit the postural description of the user and the normalized received accelerometer data to a computing device.