In the field of 3D imaging and computer vision, "Ring Artifacts" are common errors that researchers use to fix.
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. [3D] Tamaki (Ring) – NekoPoi
I am answering for the first interpretation, as "deep paper" most commonly refers to in technical contexts. Technical Context: 3D Ring Artifacts & Deep Learning In the field of 3D imaging and computer
Inpainting of Ring Artifacts on Microtomographic Images by 3D CNN Technical Context: 3D Ring Artifacts & Deep Learning
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.
A "papercraft" or physical 3D ring model made of high-quality "deep" paper stock.
A technical or academic paper about "Deep Learning" or "3D Ring Artifacts" in imaging (e.g., this study on 3D CNNs ).