4K Image Super-Resolution on Mobile NPUs: Mobile AI 2026 Challenge Report
Andrey Ignatov, Georgy Perevozchikov, Radu Timofte, Fubin Ren, Shihao Wang, Liwen Zhang, Zhe Xu, Zhipei Lei, Minjian Zhang, Kailing Tang, Dingyong Gou, Yanlin Wu, Cong Li, Xiaohui Cui, Kihwan Yoon, Ganzorig Gankhuyag, Heo MyeongCheol, Yonghyun Park, Juho Jung, Sungjei Kim, Phuong-Nam Nguyen-Pham, Nam-Tien Le, Tinh-Anh Nguyen-Nhu, Matin Fazel, Abdelhak Bentaleb, Xinrui Li, Xusheng He, Jianlong Wu, Mohsin Ikram, Dmitry Ignatov, Hao Chen, Long Sun, Jiangxin Dong, Jinshan Pan, Jinhui Tang, Siyue Teng, Yuxuan Jiang, Fan Zhang, David Bull, Zhe Xiao, Jun Xiao, Zhi-Song Liu, Jiayi Pei, Songtao Wu, Hong Shang, Kuanhong Xu
Abstract
Image super-resolution is widely used on mobile devices for upscaling various types of image data. This creates a need for efficient deep learning-based models that are not only performant but can also be deployed on neural processing units (NPUs) present in the majority of mobile and IoT chipsets. In this Mobile AI challenge, we address this problem and propose the participants to design fast solutions that can upsample images from Full HD to 4K resolution while running on popular mobile NPUs from Qualcomm and MediaTek. For this, the participants were provided with the DIV2K dataset and trained models to do an efficient 3X image upscaling. The competition had two tracks: in the first track, the models had to be fully quantized (INT8), and the runtime of all models was evaluated on the Qualcomm Snapdragon 8 Elite Gen 5 NPU. In the second track, the participants were developing floating-point solutions that were evaluated on the MediaTek Dimensity 9500 NPU. Top solutions proposed in this challenge are able to reconstruct 4K images under 5 milliseconds while reaching a PSNR score of 30 dB. A comprehensive description of the models developed in the challenge is provided in this paper.