Method and apparatus for validating bank notes
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United States of America Patent
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May 15, 2012
Grant Date -
Jun 16, 2011
app pub date -
Feb 25, 2011
filing date -
May 31, 2006
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Abstract
A banknote validator takes both reflection and transmission optical measurements at different wavelengths. An emitter and sensor on one side of the banknote path are used to make a calibration measurement using light reflected from a window on the other side of the path, overlying another optical device. Each measurement is normalized on the basis of multiple measurements of different wavelengths, distributed over a substantial area, such as along the relevant scan line, preferably using a value representing the dispersion of the measurements.
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