The Fingertracking device consists of:

• active hand target for affixing to the back of the hand. Synchronization is provided with a modulated flash and the low voltage power is provided with a rechargeable battery.
• three or five active finger markers, each consisting of an IR LED with diffusing sphere, a fixture for the finger tip and flexible wires. These active markers are time-sequentially addressed and controlled by the active hand target unit.

The output data consists of:

• position and orientation of the back of the hand.
• number of tracked fingers as well as a distinguishing value for right and left hands.
• position and orientation of the outermost phalanx, given in the hand coordinate system – Together with a radius, the position and orientation of the finger tip can be estimated.
• angles between the single phalanxes as well as their lengths – These values are estimated using tracked markers and empirical data.