Size/scale and orientation determination of a pointer in a camera-based touch system
First Claim
1. A touch system comprising:
- at least two optical recording devices associated with a touch surface, said at least two optical recording devices acquiring images of said touch surface from different locations and having overlapping fields of view; and
processing circuitry processing image data acquired by said at least two optical recording devices to detect edges of a pointer in said images and to triangulate the detected edges to determine a bounding area that defines a pointer perimeter.
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Accused Products
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.
177 Citations
2 Claims
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1. A touch system comprising:
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at least two optical recording devices associated with a touch surface, said at least two optical recording devices acquiring images of said touch surface from different locations and having overlapping fields of view; and
processing circuitry processing image data acquired by said at least two optical recording devices to detect edges of a pointer in said images and to triangulate the detected edges to determine a bounding area that defines a pointer perimeter.
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2-48. -48. (canceled)
Specification