Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
May 31, 2016
Patent Application Number
13684864
Date Filed
November 26, 2012
Patent Citations Received
Patent Primary Examiner
Patent abstract
There is provided an optical navigation device including at least one light source, an image sensor and a processing unit. The light source illuminates a work surface in a first brightness value and a second brightness value. The image sensor receives reflected light from the work surface and outputs a first image frame corresponding to the first brightness value and a second image frame corresponding to the second brightness value. The processing unit calculates a differential image of the first image frame and the second image frame and identifies an operating state according to the differential image.
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