Lift detection mechanism for optical mouse sensor

Details Lift detection mechanism for optical mouse sensor Lift detection mechanism for optical mouse sensor

2008-07-29

2008-07-29

Dharia, Prabodh (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Cursor mark position control device

C345S161000, C345S162000, C345S163000, C345S167000

Reexamination Certificate

active

11011164

ABSTRACT:
A method for detecting a lift condition from an illuminated surface portion of an optical motion sensing device. According to a first embodiment, two different “loss-of-focus” thresholds are used. A first threshold is used when the optical pointing device is not moving, and a second threshold greater than the first one is used when the optical pointing device is moving. The optical device further requires means for detecting whether it is moving or not. According to a second embodiment, a dynamical loss-of-focus threshold depending on an average number of motion features that the surface exhibits to the sensor of the optical pointing device is used.

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Pending U.S. Appl. No. 10/609,686 filed Jul. 1, 2003.

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