Fiducial markers

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Fiducial markers are visible objects placed in an imaging system (camera) as reference points or measuring units. In VR and AR, fiducial markers are used for positional tracking of HMDs and Input Devices. Fiducial markers can be utilized in both inside-out tracking and outside-in tracking. They can be placed in the environment and serve as

Tracking systems that do not use fiducial markers are called Markerless tracking.