QwertyRing: Text Entry on Physical Surfaces Using a Ring
summary
A ring with an IMU worn on the middle phalanx maps finger orientation to an imagined QWERTY layout on any desk-like surface, detects touchdown/touchup with an SVM (vertical acceleration a key feature) at >99% accuracy and classifies long-press and swipes by thresholds, and decodes words using a decoder built from users’ fan-shaped key distributions with word suggestions. Evaluation over five days shows IMU ring on middle phalanx, 99% touch detection accuracy, 13.74 WPM → 20.59 WPM, word-suggestion decoder.
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