发明名称 |
Optimization of statistical movement measurement for optical mouse, with particular application to laser-illuminated surfaces |
摘要 |
<p>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 device comprising an array of pixels and comparators for extracting motion features, said method comprising the steps of:
a) illuminating by means of said coherent light source said surface portion at a determined flash rate;
b) detecting by means of said array of pixels a speckled light intensity pattern of said illuminated portion of the surface for each flash;
c) extracting edge direction data of two different types from said detected speckled light intensity patterns by comparing light intensity between pixels;
d) determining a measurement of the relative motion between said optical sensing device and said illuminated portion of the surface based on extracted edge direction data;
wherein the extracting edge direction data step comprises a preliminary step consisting of introducing a selecting factor which promotes detection of one type of edge direction data rather than the other type.
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申请公布号 |
EP1868066(A3) |
申请公布日期 |
2008.01.23 |
申请号 |
EP20070109744 |
申请日期 |
2007.06.06 |
申请人 |
EM MICROELECTRONIC-MARIN SA |
发明人 |
BIEBER, LAWRENCE;WILLEMIN, MICHEL;AFRIAT, GIL;LAUFFENBURGER, JAMES HAROLD;BUESCHER, KEVIN SCOTT |
分类号 |
G06F3/03 |
主分类号 |
G06F3/03 |
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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