METHOD FOR PROTECTING THE AUTHENTICITY OF AN OBJECT, ITEM, DOCUMENT, PACKAGING AND/OR A LABEL FROM IMITATION, FORGERY AND THEFT

摘要

The invention describes a method for protecting the authenticity of an object, item, document, packaging and/or a label from imitation, forgery and theft, whereas during such marking by means of graphic halftone visually encoded image keeping qualitative-quantitative data of an subject and containing a hidden verification hash code in the form of a digital watermark (DWM), square data cells of the cross-linked structure of the graphic halftone image with identical brightness values are revealed in the entire area inside the revealed square data cell, thereafter a square-cross-linked mask is formed to store the base of the revealed readable data cells, the applied digital watermark (DWM) is read and opposed by means of comparison of the brightness of color components of the central of the revealed readable data cell against the arithmetic mean value of the brightness of the components of the eight neighbor squares surrounding the revealed readable data cell.