# Transforms

A two-dimensional (2D) transformation mathematically maps points from one 2D space to another. In VisionPro, a 2D transformation always maps points from a source coordinate space, called the from space, to a second coordinate space, called the to space. Many machine vision tasks, for example, require you to correlate points in an image’s coordinate space to those in a user-defined space. The two coordinate spaces often have different measurement units for expressing the coordinates. You use a 2D transformation to map the points correctly from the pixel space to the user space.