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 AHAP (Reconstructing Arbitrary Humans from Arbitrary Perspectives), 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 AHAP achieves competitive performance on both world-space human reconstruction and camera pose estimation, while being 180× faster than optimization-based approaches.
@article{arxiv.2602.23951,
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},
journal= {arXiv preprint arXiv:2602.23951},
year = {2026}
}