TabletStone: Role-Aware, Rotation-Robust On-Stone Visualization for Curling Training

Real-time feedback is increasingly valued in sports training, yet in curling it is commonly delivered through off-stone displays or post hoc review, forcing disruptive gaze shifts while athletes track a moving and continuously rotating stone, especially during collaborative sweeping. To address this gap, we present TabletStone, a stone-mounted tablet interface that provides in situ, glanceable feedback with role-aware layouts and rotation-robust visualization. TabletStone is implemented as a lightweight, UDP-driven endpoint that renders upstream training signals on the stone while adapting the UI to throwers and sweepers. To preserve readability under rotation, we formalize an absolute-position fixation strategy based on an on-device yaw estimate and counter-rotation transforms. We evaluate TabletStone through an initial controlled user study with six experienced curlers performing sweeping while reading on-stone values under two conditions (baseline and absolute-position fixation). The study showed higher subjective readability together with improved accuracy and recall for absolute-position fixation, while precision remained high in both conditions; missed readouts remained the dominant failure mode under workload. Overall, these results support the feasibility and potential usefulness of combining role-aware UI/UX with rotation-aware stabilization for on-object feedback in curling training, while broader training effects remain to be validated.