Min Zhao 0013 Bokai Yan Xue Yang Hongzhou Zhu Jintao Zhang Shilong Liu 0004 Chongxuan Li Jun Zhu 0001 UltraImage: Rethinking Resolution Extrapolation in Image Diffusion Transformers. 2025 December abs/2512.04504 CoRR https://doi.org/10.48550/arXiv.2512.04504 db/journals/corr/corr2512.html#abs-2512-04504 streams/journals/corr