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Learning Sensor Interdependencies for IMU-to-Segment Assignment
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DOI：10.1109/ACCESS.2021.3105801.png)
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Abstract
En 中文
Due to the recent technological advances in inertial measurement units (IMUs), many applications for the measurement of human motion using multiple body-worn IMUs have been developed. In these applications, each IMU has to be attached to a predefined body segment. A technique to identify the body segment on which each IMU is mounted allows users to attach inertial sensors to arbitrary body segments, which avoids having to remeasure due to incorrect attachment of the sensors. We address this IMU-to-segment assignment problem and propose a novel end-to-end learning model that incorporates a global feature generation module and an attention-based mechanism. The former extracts the feature representing the motion of all attached IMUs, and the latter enables the model to learn the dependency relationships between the IMUs. The proposed model thus identifies the IMU placement based on the features from global motion and relevant IMUs. We quantitatively evaluated the proposed method using synthetic and real public datasets with three sensor configurations, including a full-body configuration mounting 15 sensors. The results demonstrated that our approach significantly outperformed the conventional and baseline methods for all datasets and sensor configurations.
Keywords:
Sensors
Feature extraction
Motion segmentation
Task analysis
Data models
Three-dimensional displays
Sensor phenomena and characterization
Inertial measurement units
IMU-to-segment assignment
attention mechanism
convolutional neural network
recurrent neural network
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