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arXiv · 2510.02601

Ego-Exo 3D Hand Tracking in the Wild with a Mobile Multi-Camera Rig

Patrick Rim·Kun He·Kevin Harris·Braden Copple·Shangchen Han·Sizhe An·Ivan Shugurov·Tomas Hodan·He Wen·Xu Xie
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Abstract

Accurate 3D tracking of hands and their interactions with the world in unconstrained settings remains a significant challenge for egocentric computer vision. With few exceptions, existing datasets are predominantly captured in controlled lab setups, limiting environmental diversity and model generalization. To address this, we introduce a novel marker-less multi-camera system designed to capture precise 3D hands and objects, which allows for nearly unconstrained mobility in genuinely in-the-wild conditions. We combine a lightweight, back-mounted capture rig with eight exocentric cameras, and a user-worn Meta Quest 3 headset, which contributes two egocentric views. We design an ego-exo tracking pipeline to generate accurate 3D hand pose ground truth from this system, and rigorously evaluate its quality. By collecting an annotated dataset featuring synchronized multi-view images and precise 3D hand poses, we demonstrate the capability of our approach to significantly reduce the trade-off between environmental realism and 3D annotation accuracy.

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Patrick Rim, Kun He, Kevin Harris, Braden Copple, Shangchen Han, Sizhe An, Ivan Shugurov, Tomas Hodan, He Wen, Xu Xie. 2025-10-02. Ego-Exo 3D Hand Tracking in the Wild with a Mobile Multi-Camera Rig. https://arxiv.org/abs/2510.02601

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