| 20110043446 | COMPUTER INPUT DEVICE - Computer input apparatus comprising: an image capture device; and a marker member comprising at least two reference indicia, at least a first reference indicium being arranged to emit or reflect light having a first spectral characteristic, and at least a second reference indicium being arranged to emit or reflect light having a second spectral characteristic different from the first spectral characteristic, the image capture device being arranged to distinguish light of said first spectral characteristic from light of said second spectral characteristic thereby to distinguish the at least a first reference indicium from the at least a second reference indicium, the apparatus being configured to capture an image of the at least two reference indicia and to determine by means of said image a position and orientation of the marker member with respect to a reference frame. | 02-24-2011 |
