Method and system for fall detection of a user
First Claim
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1. A method for fall detection of a user, the method comprising:
- determining whether first or second magnitude thresholds are satisfied;
if the first or second magnitude thresholds are satisfied, determining whether an acceleration vector of the user is at a predetermined angle to a calibration vector or whether the user is at a stooped posture; and
if the acceleration vector of the user is at the predetermined angle to the calibration vector or if the user is at the stooped posture, determining whether an activity metric is satisfied, wherein if a moving average of the user is greater than a predetermined activity level, the activity metric is not satisfied and notification information of the fall detection is disregarded, wherein if the moving average of the user is lesser than the predetermined activity level, the activity metric is satisfied and the notification information of the fall detection is confirmed,wherein determining whether first or second magnitude thresholds are satisfied further comprises;
obtaining an acceleration sample from the user;
comparing the acceleration sample to a first acceleration threshold;
wherein if the acceleration sample is less than the first acceleration threshold, the first magnitude threshold is satisfied, else comparing the acceleration sample to a second acceleration threshold;
wherein if the acceleration sample is greater than the second acceleration threshold, the second magnitude threshold is satisfied, andwherein comparing the acceleration sample to the first acceleration threshold further comprises;
applying two filters to the acceleration sample to output an acceleration vector;
calculating LP-norm of the acceleration vector to output an acceleration scalar; and
comparing the acceleration scalar to the first acceleration threshold.
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Abstract
A method and system for fall detection of a user are disclosed. In a first aspect, the method comprises determining whether first or second magnitude thresholds are satisfied. If the first or second magnitude thresholds are satisfied, the method includes determining whether an acceleration vector of the user is at a predetermined angle to a calibration vector or whether the user is at a stooped posture. If the acceleration vector of the user is at the predetermined angle to the calibration vector or if the user is at the stooped posture, the method includes determining whether an activity metric is satisfied.
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Citations
15 Claims
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1. A method for fall detection of a user, the method comprising:
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determining whether first or second magnitude thresholds are satisfied; if the first or second magnitude thresholds are satisfied, determining whether an acceleration vector of the user is at a predetermined angle to a calibration vector or whether the user is at a stooped posture; and if the acceleration vector of the user is at the predetermined angle to the calibration vector or if the user is at the stooped posture, determining whether an activity metric is satisfied, wherein if a moving average of the user is greater than a predetermined activity level, the activity metric is not satisfied and notification information of the fall detection is disregarded, wherein if the moving average of the user is lesser than the predetermined activity level, the activity metric is satisfied and the notification information of the fall detection is confirmed, wherein determining whether first or second magnitude thresholds are satisfied further comprises; obtaining an acceleration sample from the user; comparing the acceleration sample to a first acceleration threshold; wherein if the acceleration sample is less than the first acceleration threshold, the first magnitude threshold is satisfied, else comparing the acceleration sample to a second acceleration threshold; wherein if the acceleration sample is greater than the second acceleration threshold, the second magnitude threshold is satisfied, and wherein comparing the acceleration sample to the first acceleration threshold further comprises; applying two filters to the acceleration sample to output an acceleration vector; calculating LP-norm of the acceleration vector to output an acceleration scalar; and comparing the acceleration scalar to the first acceleration threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A wireless sensor device for fall detection of a user, the wireless sensor device comprising:
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a processing system; and an application to be executed by the processing system, wherein the application; determines whether first or second magnitude thresholds are satisfied, if the first or second magnitude thresholds are satisfied, determines whether an acceleration vector of the user is at a predetermined angle to a calibration vector or whether the user is at a stooped posture, and if the acceleration vector of the user is at the predetermined angle to the calibration vector or if the user is at the stooped posture, determines whether an activity metric is satisfied, wherein if a moving average of an activity level of the user is greater than a predetermined activity level, the activity metric is not satisfied and notification information of the fall detection is disregarded, wherein if the moving average of the activity level of the user is lesser than the predetermined activity level, the activity metric is satisfied and the notification information of the fall detection is confirmed, wherein the application further; obtains an acceleration sample from the user; compares the acceleration sample to a first acceleration threshold; wherein if the acceleration sample is less than the first acceleration threshold, the first magnitude threshold is satisfied, else the application compares the acceleration sample to a second acceleration threshold; wherein if the acceleration sample is greater than the second acceleration threshold, the second magnitude threshold is satisfied, wherein the application further; applies two filters to the acceleration sample to output an acceleration vector;
calculates LP-norm of the acceleration vector to output an acceleration scalar; andcompares the acceleration scalar to the first acceleration threshold or to the second acceleration threshold. - View Dependent Claims (14, 15)
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Specification