In this report, we summarize the first NTIRE challenge on light field (LF) image super-resolution (SR), which aims at super-resolving LF images under the standard bicubic degradation with a magnification factor of 4. This challenge develops a new LF dataset called NTIRE-2023 for validation and test, and provides a toolbox called BasicLFSR to facilitate model development. Compared with single image SR, the major challenge of LF image SR lies in how to exploit complementary angular information from plenty of views with varying disparities. In total, 148 participants have registered the challenge, and 11 teams have successfully submitted results with PSNR scores higher than the baseline method LF-InterNet \cite{LF-InterNet}. These newly developed methods have set new state-of-the-art in LF image SR, e.g., the winning method achieves around 1 dB PSNR improvement over the existing state-of-the-art method DistgSSR \cite{DistgLF}. We report the solutions proposed by the participants, and summarize their common trends and useful tricks. We hope this challenge can stimulate future research and inspire new ideas in LF image SR.

本文总结了首个基于光场图像超分辨率的 NTIRE 挑战赛，该挑战旨在在标准双三次降级下将光场图像进行超分辨率处理，其中着重探讨了如何利用大量视角相互补充的角度信息来进行超分辨率处理，并介绍了从148个参赛者中评选出的11个团队的解决方案和他们的关键技巧。

NTIRE 2023 光场图像超分辨率挑战：数据集、方法和结果