# Default Origin

If you specify to the tool that no fiducial mark is present in the calibration image, the tool assigns the origin of raw calibrated space to be the vertex closest to the center of the calibration image. The x-axis is aligned to the vertex grid axis that is closest in angle to the x-axis of the calibration image's image coordinate space. The y-axis is aligned to the vertex grid axis that is closest in angle to the y-axis of the calibration image's image coordinate space.

The following figure shows how the tool assigns the default origin: