| 摘要 |
2066201 9103031 PCTABS00003 A method and a means for checking genuineness of paper money are based upon detection of the characteristic differences in the printing process for genuine bank notes and counterfeit bills produced with a colour copying machine. The detection is conducted in narrow wavelength bands respectively in typical red and blue colour ranges, and simultaneously in particular directions, with reflected and scattered light. Detection of intensity in a correspondingly narrow band near the maximum sensitivity range of the eye, i.e. in the green range, and in another direction, is also conducted for reference purposes. Preferably the measurement is made in a particularly selected point where the contents of blue and red in the print of the genuine bank note is at an extremum, i.e. high or low.
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