Source: http://www.google.com/patents/US7872639?dq=6,249,7726,249,772
Timestamp: 2014-03-16 13:44:47
Document Index: 269066307

Matched Legal Cases: ['Application No. 200580010487', 'Application No. 200580010487', 'Application No. 200580010487', 'Application No. 200580010487', 'Application No. 200610091123', 'Application No. 200610091123', 'Application No. 200610091123', 'Application No. 200610091123', 'Application No. 200610091123', 'Application No. 200710088276', 'Application No. 200710088276', 'Application No. 102006030260', 'Application No. 102006030260', 'Application No. 102008058759', 'Application No. 112005000701', 'Application No. 112005000701']

Patent US7872639 - Optical displacement detection over varied surfaces - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsEmbodiments of the present invention enable an optical device to track on a diffusing surface over which a transparent and/or translucent and/or optically smooth surface is placed. Some embodiments are directed towards detecting when an optical device is lifted off the surface it was resting on. Embodiments...http://www.google.com/patents/US7872639?utm_source=gb-gplus-sharePatent US7872639 - Optical displacement detection over varied surfacesAdvanced Patent SearchPublication numberUS7872639 B2Publication typeGrantApplication numberUS 11/522,834Publication dateJan 18, 2011Filing dateSep 18, 2006Priority dateJun 30, 2005Also published asCN1924774A, CN1924774B, DE102006030260A1, US7898524, US20070008286, US20070013661Publication number11522834, 522834, US 7872639 B2, US 7872639B2, US-B2-7872639, US7872639 B2, US7872639B2InventorsOlivier Theytaz, Nicolas Sasselli, Boris Karamata, Nicolas Chauvin, Olivier MathisOriginal AssigneeLogitech Europe S.A.Export CitationBiBTeX, EndNote, RefManPatent Citations (96), Non-Patent Citations (45), Referenced by (1), Classifications (6), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetOptical displacement detection over varied surfacesUS 7872639 B2Abstract Embodiments of the present invention enable an optical device to track on a diffusing surface over which a transparent and/or translucent and/or optically smooth surface is placed. Some embodiments are directed towards detecting when an optical device is lifted off the surface it was resting on. Embodiments also include a sensing system that detects the z distance (distance to the tracking surface) and improves image quality by improving the effectiveness of the optical sensor subsystem and/or the illumination subsystem at the detected z distance. Other embodiments include a system and method that enables an optical device to track on a transparent and/or translucent and/or optically smooth surface alone. This may involve dark-field imaging based on certain features (e.g., dirt) already present on the transparent surface. Alternately, this may involve creating features such as droplets, spreading dirt residue, and creating thermal spots, which can be used for tracking.
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