AR Markers are square fiducial markers composed by a wide black border and a inner binary matrix which determines its identifier (ID). These markers are detected in the camera stream of the [[POI_View|POI View ]] and can be used for [[AR-Marker#Direct_Augmentation|Direct Augmentation]] or [[AR-Marker#AR-Marker Device Pose Estimation|Device Pose calculation]].
The AR-Marker ID is defined as an integer value between zero and the maximum dictionary size (see [[AR-Marker#Marker Creation|Marker Creation]]). Once a marker is detected, the ID is used to gather additional information from the associated UBIK® object (see [[AR-Marker#Classifications|Classifications]]).
The four corner points of an AR-Marker are extracted to calculate the relative pose (position and orientation) between the camera and the AR-Marker, which serves as a basement for the above stated use-cases. For that camera of the mobile device has to be calibrated (see [[Camera_Calibration|Camera Calibration]]) and the AR-Marker side length has to be known.
== Marker Creation ==