AHAP: Reconstructing Arbitrary Humans from Arbitrary Perspectives with Geometric Priors

Abstract

Reconstructing 3D humans from images captured at multiple perspectives typically requires pre-calibration, like using checkerboards or MVS algorithms, which limits scalability and applicability in diverse real-world scenarios. In this work, we present \textbf{\ours{}} (Reconstructing \textbf{A}rbitrary \textbf{H}umans from \textbf{A}rbitrary \textbf{P}erspectives), a feed-forward framework for reconstructing arbitrary humans from arbitrary camera perspectives without requiring camera calibration. Our core lies in the effective fusion of multi-view geometry to assist human association, reconstruction and localization. Specifically, we use a Cross-View Identity Association module through learnable person queries and soft assignment, supervised by contrastive learning to resolve cross-view human identity association. A Human Head fuses cross-view features and scene context for SMPL prediction, guided by cross-view reprojection losses to enforce body pose consistency. Additionally, multi-view geometry eliminates the depth ambiguity inherent in monocular methods, providing more precise 3D human localization through multi-view triangulation. Experiments on EgoHumans and EgoExo4D demonstrate that \ours{} achieves competitive performance on both world-space human reconstruction and camera pose estimation, while being 180$\times$ faster than optimization-based approaches. \end{abstract}

BibTeX

@misc{qiao2026ahap,
  title      = {AHAP: Reconstructing Arbitrary Humans from Arbitrary Perspectives with Geometric Priors},
  author     = {Xiaozhen Qiao and Wenjia Wang and Zhiyuan Zhao and Jiacheng Sun and Ping Luo and Hongyuan Zhang and Xuelong Li}
}