Method and apparatus for screening documents
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United States of America Patent
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May 22, 2001
Grant Date -
N/A
app pub date -
Aug 28, 1997
filing date -
Feb 15, 1997
priority date (Note) -
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Abstract
A method and apparatus for screening documents such as bank notes 1 for suitability for continued circulation, in which a damage index is computed for each document from a number of factors comprising a shape factor, an orientation factor, a size factor and a location factor developed for each defect in the document. Shape and rotation factors are obtained by applying Fourier and/or Wavelet transforms to sets of contour signals developed on scanning a document for defects using an optical scanner (6).
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