https://www.bleepingcomputer.com/news/technology/new-ai-algorithm-can-fix-grainy-images-without-looking-at-clean-photos/

Researchers from NVIDIA, Aalto University, and MIT have developed an AI algorithm, first of its kind, that can remove noise and artifacts from images without having to look at clean photos in advance.

In a research paper published last week, researchers say they trained their system with tens of thousands of other grainy photos.