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{{see also|Marker-less, Inside-Out Tracking|positional tracking}}
[[File:F2Ak4iE.jpg|thumbnail|[[Lighthouse]] prototype, a inside-out tracking system with QR codes as [[fiducial markers]].]]
In [[inside-out tracking]], the tracking camera is placed on the [[device]] being tracked such as an [[HMD]]. The device looks out to the world around it and uses the changing perspectives of the outside world to determine its own position in space. [[Fiducial markers]] such as QR codes can be placed in the outside world to serve as reference points for the tracking camera.
