Method for controlling an intensity of an infrared source used to detect objects adjacent to an interactive display surface
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United States of America Patent
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Aug 31, 2010
Grant Date -
Dec 15, 2005
app pub date -
Jun 14, 2004
filing date -
Jun 14, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
In an interactive display table that uses infrared (IR) light to detect an object on an interactive display surface, IR light sources within the table are controlled in response to the level of ambient IR light passing through the interactive display surface. Light from the IR light sources that is reflected the regions disposed inside the table and peripherally around the interactive display surface is captured in an image that also includes the ambient IR light passing through the interactive display surface. A signal corresponding to the image is processed, so that the relative levels of the IR light can be compared. The IR light sources are then controlled so that the level of IR light reflected from the regions exceeds the level of ambient IR light by at least a predefined amount.
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