Apparatus for determining the location of a pointer within a...

Computer graphics processing and selective visual display system – Display peripheral interface input device – Cursor mark position control device

Reexamination Certificate

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Details

C178S018090, C345S173000, C345S175000

Reexamination Certificate

active

10681330

ABSTRACT:
An apparatus for detecting a pointer within a region of interest includes a first reflective element extending along a first side of the region of interest and reflecting light towards the region of interest. A second reflective element extends along a second side of the region of interest and reflects light towards the region of interest. The second side is joined to the first side to define a first corner. A non-reflective region generally in the plane of at least one of the first and second reflective elements is adjacent the first corner. At least one imaging device captures images of the region of interest including reflections from the first and second reflective elements.

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patent: WO 02/03316 (2002-01-01), None

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