ViFin: Harness Passive Vibration to Continuous Micro Finger Writing with a Commodity Smartwatch
summary
ViFin tracks continuous micro finger writing using only the commodity smartwatch IMU (accelerometer and gyroscope), applies a full‑bandwidth dynamic programming aligner with a GRU network plus a null class to decode letters, and uses transfer learning, per‑user calibration, and spellcheck to adapt. Real system runs standalone, links to MadGaze for display, trained on 15 participants, tested across arm positions, speeds, and displacements, and achieves 90% and 91% accuracy for numbers and letters respectively.
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