https://scholar.lib.ntnu.edu.tw/zh/publications/automatic-ringing-artifact-detection-in-restoring-blurred-face-im-2/fingerprints/
Automatic ringing artifact detection in restoring blurred face images - 指紋 - 國立臺灣師範大學
ringing artifactblurred faceautomaticdetectionrestoring
https://invisiblechildren.com/blog/2015/12/13/a-story-from-the-front-line/juvenal-face-blurred/
Juvenal- face blurred | Invisible Children
face blurredinvisible childrenjuvenal