Preserve, Reveal, Expand: Faithful 4D Video Editing with Region-Aware Conditioning

TL; DR: PREX is a region-aware framework for faithful 4D video editing. It addresses the Evidence-Role Mismatch problem in existing 4D-driven video diffusion models by decomposing the target spatiotemporal volume into Preserve, Reveal, and Expand roles.

Zhangchi Hu^1,2, Wenzhang Sun^2,†, Xiangchen Yin¹, Jiahui Yuan¹, Chunfeng Wang², Hao Li², Kun Zhan², and Xiaoyan Sun^1*

1. University of Science and Technology of China

2. Li Auto Inc.

^† Project leader, ^* Corresponding author

If you like our work, please give us a ⭐!

Announcement

The code will be released soon. Please stay tuned.

Updates

• [2026.05.20] Release paper on arXiv

Citation

@misc{hu2026preserverevealexpandfaithful,
      title={Preserve, Reveal, Expand: Faithful 4D Video Editing with Region-Aware Conditioning},
      author={Zhangchi Hu and Wenzhang Sun and Xiangchen Yin and Jiahui Yuan and Chunfeng Wang and Hao Li and Kun Zhan and Xiaoyan Sun},
      year={2026},
      eprint={2605.20961},
      archivePrefix={arXiv},
      primaryClass={cs.CV},
      url={https://arxiv.org/abs/2605.20961},
}