Method and apparatus for screening documents
US6236745A · kind A · utility
9Cited by
18References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1997 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Aug 28, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/12
- WIPO fieldControl
- WIPO sectorInstruments
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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.