# Plate2D

Plate2D is the coordinate system of the calibration plate. At any instance of time, all calibration features viewed by all cameras are described in the same Plate2D coordinate system. However, this space may be moved around in the Home2D coordinates by the motion stage. Plate2D is an orthonormal coordinate system, although its length unit may have a non-identity scale factor from Home2D. Plate2D and Home2D may have different handedness.

The origin of the Plate2D space is defined either by the fiducial mark or the data matrix codes printed on it. See the documentation on checkerboard calibration for details.

The following figure shows the Plate2D coordinate space in dark purple with pink guides to the fiducial mark features the coordinate space is derived from (in the case of stationary camera configuration).

The following figure shows the Plate2D coordinate space for the previously mentioned checkerboard calibration plate with data matrix codes. The positions marked by the data matrix codes are also shown.

Note:

- As stated earlier, the calibration plate must be parallel to the stage’s motion.
- The calibration plate should be in the plane of the part’s features that are used for alignment.