Method and apparatus for reading invisible messages
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United States of America Patent
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Jun 30, 1998
Grant Date -
N/A
app pub date -
May 17, 1996
filing date -
May 17, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and method for reading invisible messages is disclosed. Two light sources impinge upon a surface upon which a luminescent message is located. The first light excites the luminescent message, which luminesces and emits a luminescent light. The luminescent light is received by an image sensor and is converted into a first electric signal. The second light has wavelengths substantially similar to the luminescent light, which reflects from the surface and is received by an image sensor and converted to a second electric signal. The first and second signals are processed to compensate for local variations in the reflectivity of the surface.
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