# Calibration Introduction

The purpose of calibration in alignment/assembly application is to establish a shared coordinate(Home2D) so that all cameras and motion devices' coordinates can be mapped to that shared system. In run time, all feature locations found in camera's image space will be transformed to Home2D coordinates and used for calculating target pose that motion device should move to align/assembly.

In AlignPlus, there are 6 typical spaces that are used for calibration and run time feature finding: Raw2D, Camera2D, Plate2D, Stage2D, and Home2D.