发明名称 |
Motion detection mechanism for laser illuminated optical mouse sensor |
摘要 |
There is described a method for measuring relative motion between an illuminated portion of a surface and an optical sensing device comprising a coherent light source and a photodetector array, the method comprising the steps of illuminating under a determined gradient by means of the coherent light source the surface portion at a determined flash rate; detecting by means of the photodetector array speckled light intensity pattern of the illuminated portion of the surface for a first flash; detecting a second speckled light intensity pattern of the illuminated portion of the surface for a second flash; extracting motion features of two different types from the detected first and second speckled light intensity patterns; determining a measurement of the relative motion between the optical sensing device and the illuminated surface portion based on a comparison of motion features extracted; wherein before the step of determining a measurement of the relative motion, the method further comprises the step of keeping only pairs of neighbouring motion features including one motion feature of both different types.
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申请公布号 |
US7876307(B2) |
申请公布日期 |
2011.01.25 |
申请号 |
US20050165537 |
申请日期 |
2005.06.24 |
申请人 |
EM MICROELECTRONIC-MARIN SA |
发明人 |
BIEBER LAWRENCE;WILLEMIN MICHEL |
分类号 |
G09G5/08 |
主分类号 |
G09G5/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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