perustakuva

Perustakuva is a Finnish term meaning base image or reference image. It denotes an image that acts as a standard, starting point, or basis for comparison, alignment, or calibration in image-based work. The term is formed from perusta "base, foundation" and kuva "image, picture."

In image processing and computer vision, perustakuva serves as a reference frame to register other images to a common coordinate system, to normalize color and exposure, or to detect changes over time. In remote sensing and geospatial workflows, perustakuva may refer to a cloud-free, radiometrically calibrated scene that anchors subsequent analyses across dates or sensors. In photography and cinematography, it can denote a controlled capture of a scene under standardized lighting against which other takes are measured.

Use and standards: A perustakuva is typically high quality, with known scale, orientation, and metadata such as georeferencing or camera parameters. It may be generated specifically for a project or drawn from an existing canonical dataset. The concept is closely related to reference image, template image, or calibration image.