A "papercraft" or physical 3D ring model made of high-quality "deep" paper stock.

Inpainting of Ring Artifacts on Microtomographic Images by 3D CNN

Modern papers suggest that using a "multi-scale structural similarity index" (MS-SSIM) helps the AI understand the geometry better, leading to "perfect" visual corrections in 3D models.

If you were actually looking for information regarding a specific or character model from NekoPoi , please let me know, as that would fall under a very different category of content.

I am answering for the first interpretation, as "deep paper" most commonly refers to in technical contexts. Technical Context: 3D Ring Artifacts & Deep Learning

Which of these interpretations were you looking for, or were you referring to something else entirely?

In the field of 3D imaging and computer vision, "Ring Artifacts" are common errors that researchers use to fix.