Phree and 3d laser interferometry

Phree is the world s first unrestricted high resolution write virtually anywhere mobile input device Phree lets you write draw annotate and express yourself in countless other ways on virtually any surface At OTM Technologies we invented our Optical Translation Measurement OTM technology that precisely tracks hand motion across almost any surface in a wide dynamic range The OTM sensor is the world s only three dimensional optical interferometer built into a compact and low cost package