Research And Application Of Digital Watermark Anti-counterfeiting Technology Based On Two-dimensional Code Images

The two-dimensional code is widely used in product anti-counterfeiting,traceability and other fields.The digital watermarking not only effectively protects its ownership,but also does not affect normal use.The digital watermarking has invisibility and robustness in the two-dimensional code.Therefore,a digital watermarking algorithm based on two-dimensional code images is proposed.Firstly,divide the two-dimensional code image into blocks and perform Discrete Cosine Transform(DCT)on each block;secondly,re-acquire each center of block with a singular value decomposition(SVD),and finally encrypt the watermark image by Logistic and place Arnold transform into the singular value decomposition eigenvalue and form a watermarked two-dimensional code image.The inverse process of watermarking with two-dimensional code implements watermark extraction.Experiments prove that the watermark in the two-dimensional code is effective against many kinds of image attacks,and has good robustness,security,and invisibility.The firefly algorithm(FA)is used to optimize the placement parameters of the watermark image by finding the optimal solution of the objective function,which is a linear combination of invisibility and robustness.Instead of using the conventional single placement parameters,corresponding optimal placement parameters are generated at each digital watermark insertion point.This method can generate digital watermark adaptive parameters.Experiments have proved that this method can produce adaptive parameters with both invisibility and robustness for two-dimensional code images and ordinary grayscale images.The digital watermarking method for two-dimensional codes is applied to the traceability system of agricultural products,and is compared with other two-dimensional code anti-counterfeiting methods in terms of uniqueness and practicality,and has a strong practicability in the production process of two-dimensional codes.The two-dimensional code copyright verification part plays a role in achieving good results in practical applications,and is of great significance for the prevention of counterfeit and ownership rights of two-dimensional code images.