Li, Xin, Xin Jin, Tao Yu, Simeng Sun, Yingxue Pang, Zhizheng Zhang, and Zhibo Chen. 2021. “Learning Omni-Frequency Region-Adaptive Representations for Real Image Super-Resolution”. Proceedings of the AAAI Conference on Artificial Intelligence 35 (3):1975-83. https://doi.org/10.1609/aaai.v35i3.16293.