Printing Digital Watermark Technology Research

With image prints influence more widely in people's life,it has become an urgent problem to be solved how to protect the intellectual property of prints. Special, with the rapid development of new technology, prints's counterfeiting level also had greatly improved. Outlaws obtain benefits to manufacture fake and sale fake, brings to the society of economic interests, but also brings social undesirable effects. Because the traditional printing technology upgrades slower, scientific content low and cost is high, already can not adapt to emerge in endlessly of counterfeit means. At present, the digital watermarking technology become digital media copyright protection effective means, has produced significant influence. The digital watermarking technology will provide a new print anti-counterfeiting efficient solution.This paper mainly studies the security printing watermarking algorithm. Through the analysis of the scanning process, the current research situation and problems, and proposes the corresponding solution.1,In the analysis of print and scanning principle of work and the influence of the image,we proposed nonlinear brightness transform and contrast to correction pixe distortion. Then, image in print the scanning process existing geometric distortion,we proposed harris corner detection and hausdorff distance to correct geometry distortion. Experimental results show that these two correction methods can effectively correct image distortion, improve image quality.2,On the analysis of print and scanning process have less impact on image low-frequency area, presents a discrete wavelet transform and singular value decomposition algorithm. Embed meaningless watermarking sequences in the singular value of low-frequency area. Adopt watermarking sequences related degree to judge authenticity. The experiment results show that the method has stronger robustness, and can satisfy the requirements of rapid detection.3,In order to obtain better watermark visual effect, propose based on zero-watermark meaningful printing watermarking algorithm. The scheme builds the copyright information using the relation of the maximum singular value of adjacent image sub-blocks and watermark. Experiments show that this method can resist print and scanning attacks, can distinguish image second replication (fake), meet the practical application of printing anti-counterfeiting.In the end, summing up the work, and puts forward the future research direction and the direction of further improvement.