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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. Multiple markers with unique designs can be deployed. They allow the camera(s) to track the positions of multiple objects at the same time. ===Markerless===Certain identifiable features, such as the fingers on your hands, can be tracked by camera(s) even without marker(s). [[Leap Motion]] employs this to find the position and movement of your fingers.
====Depth Map====
[[Depth Map camera]] can be used to create the
[[Microsoft]]'s [[Kinect]] uses depth map camera.
===Sensor Fusion===
