PRINTED MATTER, METHOD AND DEVICE FOR DETECTING SUCH PRINTED MATTER, AND AUTHENTICATION METHOD AND DEVICE

摘要

A printed matter in which various information unrecognizable by the vision of human being is buried in the image lines constituting a line image for securities without damaging artistic effects of a print image line and the information can be authenticated by the Fourier transform pattern of the print line mage. The printed matter which is capable of authenticating information and has a plurality of line images is characterized in that the image line is composed of a unit image line including a plurality of image lines arranged along the normal direction and intervals of the plurality of image lines in the unit image line in the normal direction are set in correspondence with the information to be buried. An authentication method, a method for burying information in the printed matter, and an authentication device for such information are also provided.