Тhe essence of the technology lies in plotting shade on paper surface by the electronic matrix containing one or several Hidden images that can be placed on a sheet quite independently from one another or can be applied one upon another. Hidden Image can cover a whole sheet or its definite places.
As per a customer’s wish Hidden Image can carry any information: a company name or logotype, a protecting code, a drawing, etc.
Detection (reading out) of the data containing in the Hidden Image can be implemented by a film decoder to be manufactured for identification of each image. While mapping a relevant decoder on certain places of a letterhead one can see the information carried by this Hidden Image.
Application of several Hidden images mapped one upon another enables to provide three control levels and so to identify a document at all levels of its usage.