The Research On Digital Watermarking Technology Of Quick Response Code

With the advent of the era of mobile Internet, QR code has been widely applied to the system of O2O(Online to Offline) where needs information fast transmission technology,because of the advantages of quickly identify,coding strongly and a large capacity of information.But due to the openness of data transformation and coding process, QR code is not absolutely anti-counterfeiting technology.In the field of higher requirements for security, two dimensional bar code technology is disability.Digital watermarking technology is born for the security and privacy. Therefore, it is very important to embed invisible watermarking in QR code and generate the only safety anti-counterfeiting QR code with the function of copyright protection, combining QR code with digital watermarking technology.The QR code watermarking technology is researched in this paper. The main contents are as follows:Firstly, propose an improved method that block-based combining discrete cosine transform with singular value decomposition watermarking scheme for QR code. Through the SVD preprocessing of the watermarking image, then diagonal matrix containing watermarking information is embedded into the carrier image data. This method not only eliminates the diagonal distortion issue in the traditional SVD watermarking method and the algorithm has better robustness to the common image processing and geometric attack. The algorithm improves that reference scheme only strong invisibility. What’s more, it also ensure the security of the watermarking.Secondly, designing a block-based image watermarking scheme based on the singular value decomposition and human visual system in the discrete wavelet transform domains.The proposed method is considered to be a block-based scheme and utilizes the entropy and edge entropy as HVS characteristics for the selection of the least complexity blocks to embed watermarking data without significant distortion, achieving maximum robustness. In addition to, traditional watermarking methods are mostly to embed the watermarking into the diagonal matrix, while this article embeds it into the first column of the left singular matrix, because the relationship between the size of the first column data of that matrix can remain unchanged. The method of singular value substitution attack has the very good resistance, and the concealment of the experiments show that the watermark is better.