Method for checking a value document, value document, use thereof, and value document system
A method for checking, in particular the authenticity and/or the nominal value of a value document having luminescent feature substances, comprises: a1) the step of carrying out a location-specific measurement of first luminescence intensities at a first emission wavelength at different locations of the value document that have the location coordinates, to thereby obtain measurement value pairs; b1) the step of statistically analyzing the first luminescence intensities measured in dependence on the individual location coordinates, by determining at least one statistical parameter using a statistical method; and c1) the step of comparing the statistical parameter determined in the step b1) with one or more threshold values.
1. A method for checking including authenticity and the nominal value of a value document having luminescent feature substances, the value document being a non-transitory machine-readable medium, the method comprising:
a1) the step of carrying out a location-specific measurement of first luminescence intensities (L1) at a first emission wavelength at different locations of the value document that have the location coordinates (O), to thereby obtain (O/L1) measurement value pairs;
b1) the step of statistically analyzing the first luminescence intensities (L1) measured in dependence on the individual location coordinates (O), by determining at least one statistical parameter using a statistical method; and
c1) the step of comparing the statistical parameter determined in the step b1) with one or more threshold values;
wherein at least 20 (O/L1) measurement value pairs are evaluated per value document for determining the statistical parameter.
2. The method according to claim 1 , wherein the method has in addition to the substeps a1), b1) and c1) the following substeps a2), b2) and c2):
a2) the step of carrying out a location-specific measurement of second luminescence intensities (L2) at a second emission wavelength at the different locations of the value document that have the location coordinates (O), to thereby obtain (O/L2) measurement value pairs;
b2) the step of statistically analyzing the second luminescence intensities (L2) measured in dependence on the individual location coordinates (O), by determining at least one statistical parameter using a statistical method; and
c2) the step of comparing the statistical parameter determined in the step b2) with one or more threshold values.
3. The method according to claim 1 , wherein the luminescence intensities drawn on for the statistical analyzing step are respectively corrected luminescence intensities converted by means of an algorithm.
4. The method according to claim 1 , wherein the luminescence intensities stated in the step b1) form a unimodal frequency distribution, i.e. in a histogram plotting relative frequency as a function of intensity the frequency distribution has the form of an individual peak with exactly one maximum.
5. The method according to claim 1 , wherein the luminescence intensities stated in the step b1) form a bimodal frequency distribution, i.e. in a histogram plotting relative frequency as a function of intensity the frequency distribution has the form of altogether two peaks with exactly two maxima.
6. The method according to claim 1 , wherein
the luminescence intensities stated in the step b1) form a multimodal or polymodal frequency distribution, i.e. in a histogram plotting relative frequency as a function of intensity the frequency distribution has the form of a plurality (n) of peaks with exactly (n) maxima, where n≧3.