Auraring: Precise Electromagnetic Finger Tracking
AuraRing: Precise Electromagnetic Finger Tracking FARSHID SALEMI PARIZI∗, ERIC WHITMIRE∗, and SHWETAK PATEL, University of Washington Fig. 1. AuraRing is 5-DoF electromagnetic tracker that enables precise, accurate, and fine-grained finger tracking for AR, VR and wearable applications. Left: A user writes the word "hello" in the air. Right: Using AuraRing to play a songinamusic application on a smart glass. Wearable computing platforms, such as smartwatches and head-mounted mixed reality displays, demand new input devices for high-fidelity interaction. We present AuraRing, a wearable magnetic tracking system designed for tracking fine-grained finger movement. The hardware consists of a ring with an embedded electromagnetic transmitter coil and a wristband with multiple sensor coils. By measuring the magnetic fields at different points around the wrist, AuraRing estimates thefive degree-of-freedom pose of the ring. We develop two different approaches to pose reconstruction—a first-principles iterative approach and a closed-form neural network approach. Notably, AuraRing requires no runtime supervised training, ensuring user and session independence. AuraRing has a resolution of 0:1 mm and a dynamic accuracy of 4:4 mm, as measured through a user evaluation with optical ground truth. The ring is completely self-contained and consumes just 2:3 mW of power. CCS Concepts: • Human-centered computing → Interaction devices; Ubiquitous and mobile computing. Additional Key Words and Phrases: Electromagnetic tracking, mixed reality, wearable, input, finger tracking ACM Reference Format: Farshid Salemi Parizi, Eric Whitmire, and Shwetak Patel. 2019. AuraRing: Precise Electromagnetic Finger Tracking. Proc. ACM Interact. Mob. Wearable Ubiquitous Technol. 3, 4, Article 150 (December 2019), 28 pages.
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