| 摘要 |
An optical navigation device (101, 434) for determining movement relative to an object includes a source of optical radiation (103, 411) for illuminating the object (102, 418), and a detector (104, 416) for capturing phase patterns in the optical radiation returning (112, 412") from the object. The phase patterns are correlated with optical nonuniformities (502) of the object. A system is provided for controlling a positional pointer on a computer screen (632) using a mouse (634, 741) to detect movement (107-108, 512-514) relative to an object (102, 418). The system creates interferograms (521-524), each such interferogram being unique to a portion of the object over which the mouse moves, and converts (105) successive pairs of unique interferograms into signals corresponding to relative movement between the mouse and the object. The source (103, 411) of optical radiation may be selected from a list including diode emitters, LEDs, multimode vertical-cavity surface-emitting lasers (VCSELs), laser diodes, and white light.
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