Process for producing security elements that are invisible to the human eye and cannot be copied in an image, and method for verifying the authenticity of products based on the comparison of unequal information and printed image

摘要

The invention relates to a method for producing security elements in an image that are not visible to the human eye and cannot be copied, in particular for checking the authenticity of images, the image being imaged by means of a printing screen, the printing screen consisting of individual pixels. At least one field is defined in the print raster, encrypted information that cannot be copied for comparison with at least one database being stored by manipulating pixels in the field and / or by manipulating the entire field. Furthermore, the invention comprises a method for authenticity verification of products, the authenticity verification being invisible to the human eye and cannot be copied, such that a field stored in a print raster by manipulation of image points and / or a manipulated field delimited in the print raster is stored Code is read out by means of an optical device and compared with a retrievable value in at least one database. The image has at least one security element that cannot be copied, the image having evaluable information within its printing grid such that the image has at least one field which has a manipulation of the image points and / or manipulated field not visible to the human eye.