DualRing: Enabling Subtle and Expressive Hand Interaction with Dual IMU Rings
summary
DualRing uses two IMU rings on thumb and index plus a high-frequency AC impedance circuit to detect thumb-to-finger contact and identify which finger is touched, compute relative attitude via IMU rotation matrices, map that to 2D coordinates with a relaxed linear model solved by least-squares with regularization, and classify gestures with a random forest. Evaluation with 14 participants recording 31 gestures across six sets shows strong accuracy for pinches, swipes, segment selection, tapping and gripping and outperforms single-ring solutions.
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