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[[markerless tracking|'Marker-less']] refers to the lack of [[fiducial markers]] used in this type of tracking, while [[inside-out tracking|'Inside-Out']] refers to the method by which data is gathered for the tracking.
[[File:F2Ak4iE.jpg|thumbnail|A room covered in fiducial markers fror for inside out tracking, at [[Valve Corporation]]<ref>Youtube, Video: 'Steam Dev Days', on Channel: Valve, Published on Feb 11, 2014</ref>]]
==Marker-less Tracking==
Because of the difficult computations required for a software to interpret live camera input, tracking solutions that rely on cameras sometimes place [[fiducial markers]] (which may look like QR codes), in view of the tracking camera. This gives the software a known pattern to look for, which makes computation simpler and faster.