Patent ID: 6937322

Claim:
A method for testing the authenticity of printed objects by measuring light emanating from an object to be checked in at least two defined spectral regions, comprising: the object to be checked is irradiated with light having a spectrum with components in the defined spectral regions, light emanating from the object to be checked is detected in the defined spectral regions, and authenticity testing is effected on the basis of the light detected in the defined spectral regions, said of light emanating from the object is effected at a plurality of places on the object so that a test series is produced from individual measured values for each defined spectral region, a first and second test series are adapted to each other by determining from the measured values of the first test series values of an adapted series that deviate only slightly from the values of the second test series in at least one area where the two test series have substantially an identical qualitative course, and said authenticity testing is effected by comparing the adapted test series.