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Optical tracking with mark consist of adding an unique marker onto an object you want to track. Then use a camera or multiple cameras to follow the movement and position of the marker. Finally algorithms are used to figure out the position and orientation of the object.
The marker can be active or pass. Active marker, such as an IR light, can flash periodically to sync with the camera. A retroreflector can be used as a passive marker to reflect IR light emitted by the camera to create the same effect as a active one. ====Depth Map====
===Sensor Fusion===
