tinyML Research Symposium 2021: Memory-Efficient, Limb Position-Aware Hand Gesture Recognition…
tinyML Research Symposium 2021
Memory-Efficient, Limb Position-Aware Hand Gesture Recognition using Hyperdimensional Computing
Andy ZHOU, PhD Student, University of California Berkeley
Electromyogram (EMG) pattern recognition can be used to classify hand gestures and movements for human-machine interface and prosthetics applications, but it often faces reliability issues resulting from limb position change. One method to address this is dual-stage classification, in which the limb position is first determined using additional sensors to select between multiple position-specific gesture classifiers. While improving performance, this also increases model complexity and memory footprint, making a dual-stage classifier difficult to implement in a wearable device with limited resources. In this paper, we present sensor fusion of accelerometer and EMG signals using a hyperdimensional computing model to emulate dual-stage classification in a memory-efficient way. We demonstrate two methods of encoding accelerometer features to act as keys for retrieval of position-specific parameters from multiple models stored in superposition. Through validation on a dataset of 13 gestures in 8 limb positions, we obtain a classification accuracy of up to 94.34%, an improvement of over 17.79% using a model trained solely on EMG. We achieve this while only marginally increasing memory footprint over a single limb position model, requiring 8x less memory than a traditional dual-stage classification architecture.
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