Size/scale orientation determination of a pointer in a camera-based touch system
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United States of America Patent
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Jul 24, 2012
Grant Date -
Mar 11, 2010
app pub date -
Jun 11, 2009
filing date -
Nov 15, 2002
priority date (Note) -
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Abstract
A touch system includes a touch surface and at least two cameras associated with the touch surface. The at least two cameras acquire images of the touch surface from different locations and having overlapping fields of view. A digital signal processor is associated with each camera. The digital signal processors process pixel data acquired by selected pixel subsets of the at least two digital cameras to generate pointer characteristic data when a pointer exists in the acquired images. The pointer characteristic data identifies edges of the pointer. A master digital signal processor triangulates the edge information in the pointer characteristic data to determine a bounding area that represents a pointer perimeter.
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