| 摘要 |
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for three dimensional position determination of an object. In one aspect, a first electromagnetic (EM) radiation and a second EM radiation is emitted, toward a position-sensing volume, the first and second EM radiation each having a respective, different, wavelength. Scattered radiation, resulting from interaction of the emitted first and second EM radiation with an object located in the position-sensing volume, is detected. Characteristics of the detected scattered radiation have a correlation with a position of the object in the position-sensing volume. A three dimensional position of the object is determined, from the correlation. The position-sensing volume may be proximate to, and extend above, an external surface of a display screen.
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