EgoTwin: Dreaming Body and View in First Person

• URL: http://arxiv.org/abs/2508.13013v1
• Date: Mon, 18 Aug 2025 15:33:09 GMT
• Title: EgoTwin: Dreaming Body and View in First Person
• Authors: Jingqiao Xiu, Fangzhou Hong, Yicong Li, Mengze Li, Wentao Wang, Sirui Han, Liang Pan, Ziwei Liu,
• Abstract summary: EgoTwin is a joint video-motion generation framework built on the diffusion transformer architecture.<n>EgoTwin anchors the human motion to the head joint and incorporates a cybernetics-inspired interaction mechanism.<n>For comprehensive evaluation, we curate a large-scale real-world dataset of synchronized text-video-motion triplets.
• Score: 47.06226050137047
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: While exocentric video synthesis has achieved great progress, egocentric video generation remains largely underexplored, which requires modeling first-person view content along with camera motion patterns induced by the wearer's body movements. To bridge this gap, we introduce a novel task of joint egocentric video and human motion generation, characterized by two key challenges: 1) Viewpoint Alignment: the camera trajectory in the generated video must accurately align with the head trajectory derived from human motion; 2) Causal Interplay: the synthesized human motion must causally align with the observed visual dynamics across adjacent video frames. To address these challenges, we propose EgoTwin, a joint video-motion generation framework built on the diffusion transformer architecture. Specifically, EgoTwin introduces a head-centric motion representation that anchors the human motion to the head joint and incorporates a cybernetics-inspired interaction mechanism that explicitly captures the causal interplay between video and motion within attention operations. For comprehensive evaluation, we curate a large-scale real-world dataset of synchronized text-video-motion triplets and design novel metrics to assess video-motion consistency. Extensive experiments demonstrate the effectiveness of the EgoTwin framework.

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