| http://www.w3.org/ns/prov#value | - e registration of the pointer's in the image based on data from the IR-reflective elements. [0168] The IR-reflective elements 18 on the pointer are passive reflectors, therefore the differentiation between them is just their relative geometry (not the shapes or other properties of the individual reflectors). [0169] With four IR reflectors, the pointer's rotation around its axis, direction, and tip
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