The training technique used here (fitting something similar to a NeRF to different views of the same image) is pretty similar to this paper which uses a similar

The training technique used here (fitting something similar to a NeRF to different views of the same image) is pretty similar to this paper which uses a similar technique to denoise (instead of upscale) output features: https://arxiv.org/abs/2401.02957 https://arxiv.org/abs/2401.02957