The perception and generation of Human-Object Interaction (HOI) are crucial for fields such as robotics, AR/VR, and human behavior understanding. However, current approaches model this task in an offline setting, where information at each time step can be drawn from the entire interaction sequence. In contrast, in real-world scenarios, the information available at each time step comes only from the current moment and historical data, i.e., an online setting. We find that offline methods perform poorly in an online context. Based on this observation, we propose two new tasks: Online HOI Generation and Perception. To address this task, we introduce the OnlineHOI framework, a network architecture based on the Mamba framework that employs a memory mechanism. By leveraging Mamba's powerful modeling capabilities for streaming data and the Memory mechanism's efficient integration of historical information, we achieve state-of-the-art results on the Core4D and OAKINK2 online generation tasks, as well as the online HOI4D perception task.
@article{arxiv.2509.12250,
title = {OnlineHOI: Towards Online Human-Object Interaction Generation and Perception},
author = {Yihong Ji and Yunze Liu and Yiyao Zhuo and Weijiang Yu and Fei Ma and Joshua Huang and Fei Yu},
journal= {arXiv preprint arXiv:2509.12250},
year = {2025}
}