Image Pyramids

(Wikipedia 의 항목 이름은 "Pyramid (image processing)"이지만 자주 사용하는 용어는 OpenCV 항목 이름을 사용한다)

Pyramid, or pyramid representation, is a type of multi-scale signal representation developed by the computer vision, image processing and signal processing communities, in which a signal or an image is subject to repeated smoothing and subsampling. Pyramid representation is a predecessor to scale-space representation and multiresolution analysis.