Print-scan Resilient Watermarking For Color Engineering Graphics

With the rapid development of network technology,multimedia digital product has become one of the important carrier of information exchange,which provide a greater convenience for people's work and life.At the same time,in order to facilitate the sharing and exchange of information,some multimedia digital products need to be printed,sometimes even the paper documents need to be scaned.But it has led to the fact that multimedia digital products are easily stolen or distorted.Engineering graphics as a vector,with a high precision and easy to store,is widely used in machinery,manufacturing,design and other fields.Therefore,the copyright protection and source tracking of paper engineering graphics is a very valuable research topic.Firstly,the background and significance of print-scan resilient watermarking technology are introduced in detail in this paper,and the research status of print-scan resilient technology at home and abroad is expounded.This paper also analyzes the existing problems of print-scan resilient watermarking for color engineering graphics and summarizes the main work of this paper.Secondly,the article introduces the related theory knowledge of print-scan resilient watermarking,including the embedding and extraction framework of watermarking,the evaluation of watermark performance and so on.Finally,an print-scan resilient watermarking scheme based on improved flipping coefficient is proposed for the copyright protection of color engineering graphics and the performance of the experimental results and algorithms are discussed in detail.The main work of this paper includes:(1)In this paper,a novel print-scan resilient watermarking for color engineering graphics is proposed in this paper,which is based on the additive noise model.The extended flipping coefficient of each pixel is first calculated,and then the scrambling is made to it.After that,the color engineering map is partitioned into blocks according to the watermark length and the adjustment coefficient.Finally,the watermark is embedded based on the print-scan additive noise model.Experimental results and analysis show that it can effectively resist print-scan,image cutting and painting,and can achieve better imperceptibility than the existed methods.This algorithm can be applied to the copyright protection and integrity certification of color engineering graphics.(2)According to the algorithm proposed in this paper,the copyright protection and content authentication watermarking system of paper color engineering graphicsare is designed and realized,and the effectiveness of the algorithm is verified.Aiming at the characteristics of uneven distribution of color engineering graphics,complicated local texture and simple local texture,the scheme has good imperceptibility and can be used for copyright protection and content authentication of color engineering graphics.