Passive touch system and method of detecting user input
First Claim
1. A method of aligning a plurality of digital cameras in a touch system, each digital camera having a selectable pixel array with respect to a region of interest in front of a touch surface of the touch system on which a pointer contact is made, said method comprising the steps of:
- acquiring an image of said region of interest;
examining pixels within a subset of said pixel array to determine if the pixel subset is substantially looking along the plane of said touch surface; and
if notadjusting the position of said pixel subset and repeating said acquiring and said examining steps until a pixel subset is determined that looks substantially along the plane of said touch surface.
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Accused Products
Abstract
A passive touch system includes a passive 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 have overlapping fields of view. A processor receives and processes images acquired by the at least two cameras to detect the existence of a pointer therein and to determine the location of the pointer relative to the touch surface. Actual pointer contact with the touch surface and pointer hover above the touch surface can be determined.
157 Citations
4 Claims
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1. A method of aligning a plurality of digital cameras in a touch system, each digital camera having a selectable pixel array with respect to a region of interest in front of a touch surface of the touch system on which a pointer contact is made, said method comprising the steps of:
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acquiring an image of said region of interest; examining pixels within a subset of said pixel array to determine if the pixel subset is substantially looking along the plane of said touch surface; and
if notadjusting the position of said pixel subset and repeating said acquiring and said examining steps until a pixel subset is determined that looks substantially along the plane of said touch surface. - View Dependent Claims (2, 3, 4)
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Specification