IEEE/CVF International Conference on Computer Vision (ICCV), 2023
Reconstructing Groups of People with Hypergraph Relational Reasoning
Buzhen Huang,
Jingyi Ju,
Zhihao Li,
Yangang Wang
We exploit human collectiveness and correlation in crowds to improve human mesh recovery in large-scale crowded scenes (more than 50 people).

Due to the mutual occlusion, severe scale variation, and complex spatial distribution, the current multi-person mesh recovery methods cannot produce accurate absolute body poses and shapes in large-scale crowded scenes. To address the obstacles, we fully exploit crowd features for reconstructing groups of people from a monocular image. A novel hypergraph relational reasoning network is proposed to formulate the complex and high-order relation correlations among individuals and groups in the crowd. We first extract compact human features and location information from the original high-resolution image. By conducting the relational reasoning on the extracted individual features, the underlying crowd collectiveness and interaction relationship can provide additional group information for the reconstruction. Finally, the updated individual features and the localization information are used to regress human meshes in camera coordinates. To facilitate the network training, we further build pseudo ground-truth on two crowd datasets, which may also promote future research on pose estimation and human behavior understanding in crowded scenes. The experimental results show that our approach outperforms other baseline methods both in crowded and common scenarios.

We follow the previous pseudo annotator (EFT, 3DV 2020) to build 3D pseudo ground-truth for Panda and CrowdPose. We also manually filter the incorrect estimations in the camera view. Different from previous pseudo annotators, the adaption explicitly considers the crowd interactions and constraints in multi-person scenarios. The 3D models in the final dataset have plausible ordinal relationships and are consistent with image observations.


The rights to copy, distribute, and use the PseudoGroup dataset (henceforth called "PseudoGroup") you are being given access to are under the control of Yangang Wang, director of the Vision and Cognition Lab, Southeast University. You are hereby given permission to copy this data in electronic or hardcopy form for your own scientific use and to distribute it for scientific use to colleagues within your research group. Credit must be given to the publication: *Reconstructing Groups of People with Hypergraph Relational Reasoning*. For any other use, including distribution outside your research group, written permission is required from Yangang Wang.

Our method produces accurate body poses and reasonable spatial distribution on Internet images. Our method is more robust to scale variations and occlusions. In addition, the proposed approach can also reconstruct crowds with more reasonable ordinal relationships.

Related links

Buzhen Huang, Jingyi Ju, Zhihao Li and Yangang Wang. "Reconstructing Groups of People with Hypergraph Relational Reasoning". IEEE/CVF International Conference on Computer Vision (ICCV), 2023.
Acknowledgments: This work was supported in part by the National Natural Science Foundation of China (No. 62076061), the Natural Science Foundation of Jiangsu Province (No. BK20220127).