Research on Dual Anti Duplication and Anti-counterfeiting Technology of QR Code Based on Metamerism Characteristics

Ordinary QR code does not have the function of anti duplication, and it is easy to be copied and counterfeited. In order to overcome this loophole, an anti-counterfeiting method using CMYK color printing metamerism characteristics + embedded pseudo-random noise is adopted to generate a QR code with dual anti duplication and anti-counterfeiting (secure QR code for short). Firstly, the anti-counterfeiting information is encoded and embedded into the ordinary QR code in the form of noise to generate the first-level anti-copying and anti-counterfeiting QR code with information. Then the CMYK color ratio is modulated with the second-level anti-counterfeiting information to satisfy the metamerism characteristic, and the second-level anti-counterfeiting is realized. Experimental tests show that the secure QR code designed in this paper has good information hiding performance, anti-replication performance and multi-code integration function, and can be used in anti-counterfeiting of trademarks, books, labels, etc.