Last fall Apple acquired PrimeSense, the company that originally licensed the technology Microsoft used to develop the Kinect. Since then things have been quiet, but today one of PrimeSense's patents was transferred to Apple — specifically one that deals with the optical projection technology that makes motion tracking possible.
The patent covers the technology behind PrimeSense's "lens array projector," which is what the company uses to split the original source of infrared light into an even field of points of light. Accurate motion tracking is then made possible by measuring that evenly-split field and the things that disrupt it — say a hand, arm, or a person's entire body.
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