| CPC G06V 20/95 (2022.01) [G06V 10/26 (2022.01); G06V 10/60 (2022.01)] | 14 Claims |
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1. A method of using a smartphone or a tablet for generating a digital identifier of a received copy of a printed product, wherein the received copy of the printed product includes at least one print image, the method comprising:
using an optoelectronic detection device of the smartphone or tablet to detect digital image information of the at least one print image of the received copy of the printed product,
creating, from the detected digital image information, a representation of the at least one print image, the representation composed of a multiplicity of pixels, wherein the representation is used by a unit of the smartphone or tablet to evaluate a brightness intensity for each pixel of the multiplicity of pixels, wherein evaluating the brightness intensity of each pixel of the multiplicity of pixels comprises:
segmenting the representation of the at least one print image into multiple fields that are each composed of a portion of the pixels of the multiplicity of pixels of the representation;
associating position information with each respective field of the multiple fields of the representation, the position information indicating a location of the respective field of the multiple fields within the representation of the at least one print image;
determining, for each respective field of the multiple fields of the representation, differences in respective brightness intensities of pixels in the respective field, the respective brightness intensities having been detected by the optoelectronic detection device;
causing to be displayed, on a display associated with the smartphone or tablet, a respective frequency distribution based on the differences in the respective brightness intensities of the pixels in each respective field of the multiple fields;
calculating, based on the respective frequency distribution, a respective mean value, and a respective standard deviation that is based on the respective mean value, and further calculating a respective skewness and a respective kurtosis of the respective frequency distribution; and
storing, in the smartphone or tablet, for each respective field of the multiple fields of the representation, respective position information of each respective field, together with the respective standard deviation calculated for each respective field, as well as the respective skewness and the respective kurtosis for each respective field, as the digital identifier of the received copy of the printed product;
for a plurality of copies of the printed product that were produced using same or differing production equipment, distinguishing the plurality of copies based on respective digital identifiers of respective copies of the plurality of copies;
assigning the received copy of the printed product corresponding to the representation, and based on the digital identifier of the received copy of the printed product, to a certain production series of the printed product, wherein a production series comprises those copies of a particular printed product which were produced in or with the same production equipment; and
causing the display to display the digital identifier of the received copy of the printed product in a form of a graphical and/or alphanumerical display.
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