Apparatus for detecting a pointer within a region of interest
First Claim
Patent Images
1. An apparatus for detecting a pointer within a region of interest comprising:
- at least one pair of imaging devices, said imaging devices having overlapping fields of view encompassing said region of interest;
at least one light source providing illumination across said region of interest and being within the field of view of at least one of said imaging devices; and
an optical filter associated with the at least one imaging device whose field of view sees said light source, said filter blocking light projected by said light source to inhibit said imaging device from being blinded by said projected light.
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Abstract
An apparatus for detecting a pointer within a region of interest includes at least one pair of imaging devices. The imaging devices have overlapping fields of view encompassing the region of interest. At least one light source provides illumination across the region of interest and is within the field of view of at least one of the imaging device. A filter is associated with the at least one imaging device whose field of view sees the light source. The filter blocks light projected by the light source to inhibit the imaging device from being blinded by the projected light.
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Citations
44 Claims
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1. An apparatus for detecting a pointer within a region of interest comprising:
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at least one pair of imaging devices, said imaging devices having overlapping fields of view encompassing said region of interest; at least one light source providing illumination across said region of interest and being within the field of view of at least one of said imaging devices; and an optical filter associated with the at least one imaging device whose field of view sees said light source, said filter blocking light projected by said light source to inhibit said imaging device from being blinded by said projected light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for detecting a pointer within a region of interest comprising:
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at least one pair of imaging devices, said imaging devices having overlapping fields of view looking generally across said region of interest; a light source associated with each imaging device, each said light source providing illumination across said region of interest and being in the field of view of the non-associated imaging device; an optical filter device associated with each imaging device so that substantially only light projected by the light source associated therewith is received by said associated imaging device to avoid the imaging device from being blinded by other light; and a filter device associated with each light source to alter a characteristic of projected light such that the projected light is unable to pass through the filter device associated with the non-associated imaging device. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An apparatus for detecting a pointer within a region of interest comprising:
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an imaging device adjacent at least two corners of said region of interest, the imaging devices having overlapping fields of view looking generally across said region of interest from different viewpoints, each imaging device having a different optical filter associated therewith so that each imaging device substantially only captures light having a particular characteristic thereby to avoid being blinded by light not having said particular characteristic; and a light source associated with each imaging device, each said light source projecting light across said region of interest having a particular characteristic such that the projected light only passes through the optical filter of said associated imaging device. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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31. An apparatus for detecting a pointer within a region of interest comprising:
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at least two color imaging devices having overlapping fields of view looking generally across said region of interest; processing circuitry receiving and processing images acquired by said imaging devices to determine the location of said pointer relative to said region of interest; and at least one illumination source projecting light in a specified frequency range across said region of interest thereby to provide lighting for said imaging devices, wherein said color imaging devices are sensitive to ambient light to capture color images and are sensitive to the light projected by said at least one illumination source to capture monochrome images. - View Dependent Claims (32, 33, 34, 35, 36, 37)
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38. An apparatus for detecting a pointer contact on a generally rectangular touch surface comprising:
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a color imaging device at each corner of said touch surface and having a field of view looking generally across said touch surface; processing circuitry receiving and processing images acquired by said imaging devices to determine the location of said pointer relative to said region of interest; and illumination sources surrounding said touch surface and projecting light in a specified frequency range across said touch surface thereby to provide backlighting for said imaging devices, wherein said color imaging devices are sensitive to ambient light to capture color images and are sensitive to the light projected by said illumination sources to capture monochrome images. - View Dependent Claims (39, 40)
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41. An apparatus for detecting a pointer within a region of interest comprising:
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at least two monochrome imaging devices having overlapping fields of view looking generally across said region of interest; processing circuitry receiving and processing images acquired by said imaging devices to determine the location of said pointer relative to said region of interest; at least one illumination source projecting light across said region of interest; and at least one filter changing the frequency band of light in a cycle thereby to enable said imaging devices to capture images looking across said region of interest in different lighting conditions. - View Dependent Claims (42, 43)
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44. An apparatus for detecting a pointer within a region of interest comprising:
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at least one pair of imaging devices, said imaging devices having overlapping fields of view looking generally across said region of interest; a light source associated with each imaging device, each said light source providing illumination across said region of interest and being in the field of view of the non-associated imaging device; and a different optical filter device associated with each imaging device so that substantially only light projected by the light source associated therewith is received by said associated imaging device to avoid the imaging device from being blinded by other light.
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Specification