Digital Watermarking Technique Based On2D Barcode

Digital watermarking technology is not only an important branch of information hiding technology research, but also an important technical means of copyright protection. QR bar code has some features such as a large capacity of information, confidentiality and so on. Take them combined and applied to become a new research direction.This article describes the research status of the digital watermarking and2D barcodes and the significance of carrying out this study. Analysis of both technologies combined with the two methods and achieves them:taking QR code as watermark and embedding other watermark in the QR barcode. At present, the algorithm used binary image as watermark has a lot. But the focus is still on image similarity of the QR Code, rather than whether bar code information can be read. Watermarking algorithm for binary images is less. Especially in recent years, the widespread use of the QR Code, copyright protection is becoming increasingly important.Specific research content is following:Firstly, analyses of the biggest difference between QR barcode as watermark information with other watermark information. Take a summary of the basic algorithm of digital watermarking, and experiment and analysis.Secondly, for the application, take QR barcode as the watermark information. In order to ensure that QR code, embedded as watermark information, can be read correctly, and reduce the distortion maximum extent possible after the extraction of watermark bar code, propose one algorithm of digital watermarking based on two-way Arnold transformation and QR barcodes. The pre-processing of the algorithm is a combination of two-way Arnold transform and chunked encoding scrambling. In the embedding process, it embeds watermark information in the low frequency coefficients of wavelet transform through using the singular value decomposition algorithm based on discrete wavelet transform and taking into account the characteristics of the human eye recognition system at the same time. The algorithm owns strong robustness, while a more balanced anti-attack capability.Once again, for the application, take QR barcode as a watermark carrier. In order to not have a significant impact on reading ability after watermark embedded, propose one digital watermarking algorithm for the QR barcode. The pretreatment process scrambles the watermark image with chaotic Logistic map. Then embedding watermark information in the low frequency part through discrete wavelet transform based on the adaptive spread spectrum based on discrete cosine transform algorithm. The algorithm ensures invisibility and robustness of the watermarking, while not affects information reading of the carrier QR barcode.Last, for the QR barcode as watermark information, propose a new watermarking algorithm evaluation criteria:the barcode reading rate. As a carrier for the QR barcode, propose new attack:a combination of barcode attack and watermark attack. And take restore the accuracy of the watermark as an evaluation criterion.