| 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. |
| 主权项 |
1. A method for protecting the authenticity of an object, item, document, packaging and/or a label from imitation, forgery and theft comprising applying security marking onto the surface of an object, item, document, packaging and/or label and identification of authenticity of an object, item, document, packaging and/or label by reading the marking from the surface of an object, item, document, packaging and/or label, its decoding and opposing authenticity verification results, wherein during marking of the surface of an object, item, document, packaging and/or label by means of graphic halftone visually encoded image keeping qualitative-quantitative data of an object, item and/or document 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, the revealed square data cells are conditionally divided into nine equal squares, a digital watermark (DWM) is applied by means of adjustment of the brightness of color components of the central square out of the nine squares of each revealed readable square data cell, identified on the basis of a durable read algorithm depending on the encoded qualitative-quantitative data of an object, item and/or document with the use of encoding, hashing and information redundancy algorithms, thereafter a square-cross-linked mask is formed to store the base of the revealed readable square data cells, the applied digital watermark (DWM) is read and opposed by means of comparison of the brightness of color components of the central square of the revealed readable square data cell against the arithmetic mean value of the brightness of the components of the eight neighbor squares surrounding the revealed readable square data cell. |
