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AssigneeEM Microelectronic-Marin SA
InventorsLawrence Bieber, Gil Afriat, James Harold Lauffenburger, Kevin Scott Buescher
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A method for detecting lift from a surface portion of an optical pointing device comprising a coherent light source, a photodetector device including an array of pixels, and extracting motion features including comparators with an adjustable offset value, the method comprising the steps of: (i) illuminating the surface portion with radiation by the coherent light source; (ii) detecting radiation patterns reflected from the illuminated surface portion with the photodetector device; (iii) comparing light intensity between neighbouring pixels in the detected radiation patterns; (iv) extracting motion features as a function of the result of the comparison; (v) counting the total number of motion features extracted; (vi) increasing or decreasing the comparator offset value when the total number of motion features increases or decreases; (vii) comparing the comparator offset value with an offset threshold; (viii) enabling detection of a lift condition if the comparator offset value is lower than the offset threshold.
A method for detecting lift from a surface portion of an optical pointing device, wherein the optical pointing device comprises (a) a coherent light source;
Dependencies are inferred from the claim text.