Image invariant optical speckle capturing device and method
US7715016B2 · kind B2 · utility
11Cited by
5References
18Claims
0Family size
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Key dates
| Filing date | Nov 30, 2007 |
| Grant date | May 11, 2010 |
| Priority date | — |
| Expiry date | May 27, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/03543
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An image invariant optical speckle capturing device and method. A highly coherent light is used to illuminate a surface and is scattered by the surface, and is captured from the direction with a ±10° from the angle of specular reflection. A light restrictive module is designed to confine the angular field of view of the sensor, when the speckle capturing device has a relative motion with respect to the surface, the speckle only move on the image but the shape and the intensity are almost keep constant, that is favorable for high accuracy optical pattern recognition and positioning.
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