Research And Implementation Of Dual Digital Image Watermarking Technology In Electronic Stamps

In recent years, with the rapid development of Internet technology, the society has entered a digital media era. Digital media products explosive emerged, due to the convenience of the Internet, the spread and acquisition of digital media becomes very simple. People in the enjoyment of this technology bringing convenience, at the same time, more and more troubles come, the main problems is these digital media products on the Internet is easy to be accessed to by those who are wicked because of the convenient dissemination, those people will use the convenience to illegally possessing and accessing these digital media products and make owners suffer loss. From the concept of digital image watermarking technology has been put forward to now, for decades, this technology has been greatly developed, and from theory to practice, in the field of digital copyright protection has played an important role. In the Internet banking industry, electronic form as a document become to be an indispensable element of many scenes, so to protect electronic form has important social significance and commercial value.In this paper, we first introduce the research background and the significance of the topic, and then expounds the digital image watermark based knowledge and domestic and foreign research status, compared to several classical digital image watermarking algorithm, a visible digital image watermarking algorithm and invisible watermarking algorithm for digital image based on electronic seal is proposed, finally design and realize a dual digital image watermarking system based on electronic stamp. The main contents are as follows:1) According to the analysis, many digital image watermarking algorithm is not robust for the representation type of attack(scaling and rotation) at present, this paper presents a visible watermarking algorithm for digital image based on electronic seal. Firstly, the algorithm scans the watermark to be embedded, then map the user input the original watermark, then determine the position of the watermark embedding information in accordance with the original stamp of geometric information and watermark information after embedding watermark information. Test the stamp of many types of attack, extract the watermark information, it is found that the watermarking algorithm has good robustness against most attacks.2) Because of congenital defect of visible watermarking, an attacker can easily attack the watermark information purposely, which can achieve purposeful interference, forgery, and eliminate, so it will interfere with the watermark extraction and detection of operation. Due to this, this paper presents a dual digital image watermarking scheme, the visible watermark plus a layer of invisible digital watermarking. visible digital image watermarking has a robustness against the geometric attack and invisible digital image watermarking has a robustness against purposely attacks. Experimental results show that the dual digital watermarking scheme improves the reliability and security of the watermark.3) In the area of e-form, software engineering and object-oriented software design methods are used, a dual digital watermarking system based on electronic forms is designed and implemented. The system has an authentication management, watermark embedding, watermark authentication, data storage and information management functions. The system has simple operating system and user-friendly interface, and it can be applied to electronic forms of authentication and copyright protection.