Foot Sensor Gait Detection with Adaptive Threshold Switching
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Solution Overview
Problem
Existing techniques for detecting a user's gait based on sensor data are ineffective in certain conditions, such as when the angle between the sole of the foot and the ground is below a certain threshold, leading to incomplete or inaccurate gait detection.
Innovation Solution
An information processing apparatus and method that acquires data from a sensor attached to the user's foot, uses a first threshold value to determine if gait detection is possible, and if not, employs a second, lower threshold value to detect the gait, allowing for accurate output of gait information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a first threshold value is used for gait detection, then detection accuracy is improved under normal conditions, but gait detection fails when the angle between the sole of the foot and the ground is below the threshold
Solution Approach 1:
The patent applies dynamics by switching between a first threshold value and a second threshold value based on the detection results. When gait cannot be detected using the first threshold, the system dynamically transitions to using the second threshold value, allowing the detection criteria to adapt to different walking conditions and user states.
Solution Approach 2:
The patent changes the threshold parameter from a fixed first threshold value to a variable that can switch between the first threshold value and a second threshold value. This parameter change enables the system to detect gaits under varying conditions, including when the angle between the sole of the foot and the ground is below the first threshold.
2Ease of operation
If a single threshold value is used for gait detection, then the detection process is simple, but gait information cannot be appropriately detected in all conditions
Solution Approach 1:
The patent segments the detection process into two stages: first attempting detection with the first threshold value, and if that fails, proceeding to detection with the second threshold value. This segmentation allows the system to maintain simplicity while improving accuracy by dividing the detection task into manageable steps.
Solution Approach 2:
The system uses feedback from the detection result to determine which threshold value to apply. When gait detection fails with the first threshold, this feedback triggers the switch to the second threshold value, creating a closed-loop detection process that adapts to actual detection needs.
Data Source
AI summary
An information processing apparatus (10) includes an acquisition means (11) for acquiring information based on a sensor (21) attached to a foot of a user, a detection means (12) for detecting, when a gait of the user cannot be detected based on the information indicating an angle between a sole of the foot of the user and the ground acquired by the acquisition means and a first threshold value, the gait of the user based on the information indicating the angle and a second threshold value smaller than the first threshold value, and an output means (13) for outputting information based on a result of the detection performed by the detection means.