APPARATUS AND METHOD FOR DETECTING A POINTER RELATIVE TO A TOUCH SURFACE
First Claim
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1. An interactive input system comprising:
- at least two imaging devices having overlapping fields of view of an input surface, each of said imaging devices comprising a lens having at least one form of distortion; and
processing structure determining at least one distortion parameter of each said lens during calibration.
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Abstract
An apparatus for detecting a pointer relative to a touch surface includes at least two spaced imaging assemblies having overlapping fields of view encompassing the touch surface. The imaging assemblies see the touch surface in three-dimensions as a perspective view. The imaging assemblies acquire overlapping images from different locations. A processor receives and processes image data generated by at least one of the imaging assemblies to determine the location of the pointer relative to the touch surface.
163 Citations
53 Claims
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1. An interactive input system comprising:
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at least two imaging devices having overlapping fields of view of an input surface, each of said imaging devices comprising a lens having at least one form of distortion; and processing structure determining at least one distortion parameter of each said lens during calibration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A camera-based interactive input system comprising:
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a touch surface on which contacts are made using a pointer; camera devices looking at said touch surface from different vantages and having overlapping fields, said camera devices acquiring images of said touch surface, each of said camera devices having an imperfect lens; and processing structure receiving and processing said image data to determine the location of said pointer relative to said touch surface via triangulation, said processing structure compensating for image distortion as a result of the imperfect lens of each said camera device. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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Specification