Anti-Counter Feiting Of Microstructure Screens

With the popularizing of the high accuracy printer and scanner , the Anti-Counterfeiting printing is difficultier day by day. Now, a great amount of fake and shoddy commodities bring the enormous destruction for the brand enterprise and the name brand commodity, caused the enterprise and the consumer has suffered the massive loss. Because we usually contact the image, the writing majority of must add the net way output finally through the printing halftone. I proposed that one kind simple, effective, practical, the inexpensive halftone screen forgery-proof plan appears very essential. The aim of this paper is that can apply in the actual microstructure digit screen Anti-Counterfeiting method. Firstly, I propose halftone screen technology in the article, and analysis microstructure art screen dot distortion mathematical model, the dot distortion to have the gradation change and the dot expansion compensation mechanism, screen with the microstructure dot duplication to apply the forgery-proof technology the feasibility; The next human eye cannot distinguish the criterion of dot , as well as each kind uses in the forgery-proof goal the characteristic of special dot, then the dot density of the Murry-Davies model is used to research frequency modulation to screen dot distortion dot gain compensation compensation the forgery-proof application question; Finally I propose the plan of hiding the forgery-proof data in the image, and proof feasibility and validity of the method through experiment.