👉 Ridgelet is a type of noise reduction filter used in image processing and computer vision. It was invented by John H. Riley Jr. in 1987 at the University of California, Berkeley, as part of his research on image analysis techniques. The name "ridgelet" comes from the fact that it resembles the shape of a ridge or a hill in a landscape map. Ridgelets are used to reduce noise and enhance detail in images by filtering out background noise. They work
