[Digital watermarking technology is Shenma? 】
Digital watermarking technology is increasingly playing a huge role in the field of packaging and printing. Fierce market competition will inevitably lead to the emergence of unfair competition-fake and inferior products, which directly infringes the interests of consumers, and the appearance of anti-counterfeit signs has greatly reduced the appearance of these fake and inferior products. Now the common way for people to distinguish the authenticity of the renminbi is to look at the banknotes with or without watermarks. If there is no watermark, it is counterfeit currency. This watermark is the digital watermark technology mentioned below.
Digital watermarking technology is to embed copyright information such as numbers, serial numbers, text, and image signs into multimedia data, and extract hidden watermark information through the detection and analysis of digitized files, and use these watermark information to prove the creator's Ownership, and as a certificate for authenticating products and prosecuting illegal infringement, digital watermarking has become an effective means of protecting intellectual property rights and digital multimedia anti-counterfeiting. Watermark technology is used in important prints such as paper money checks, certificates, passports, invoices, and sticker printing because the watermark has its unique nature: the first watermark is an almost invisible mark that must be placed in a specific environment It can be seen only afterwards and does not affect the use of items; the production and reproduction of the second watermark is more complicated, requiring special craftsmanship and materials, and the watermark on the printed matter is difficult to be removed. An important method for determining the authenticity of printed matter for a long time Check if it contains a watermark.
Digital watermarking is an information security technology that has only been developed in recent years. The Shanghai printing house has not yet formed a complete theory. Digital watermarking generally includes two main processes of embedding and detection. In order to increase the difficulty of removing and destroying watermarks for attackers, most digital watermark production schemes now use encryption technology during embedding detection, and only those who have the key can detect and extract the watermark. Digital watermarking also has important application value in authenticity authentication, covert communication, hidden logo, electronic identity authentication and so on. The research of digital watermarking technology involves research fields such as informatics, cryptography, mathematics, computer science, pattern recognition, etc., which makes the hidden information more concealed, safe, and also has symmetry and error correction.
With the advent of the digital age, the multimedia digital world is rich and colorful, and digital products affect almost everyone's daily life. How to protect these digital products that are closely related to us, such as copyright protection, information security, data authentication, and access control, etc., is increasingly valued and becomes urgently needed. Drawing on the meaning and function of ordinary watermarks, people adopt similar concepts to protect multimedia data such as digital images and digital music, so the concept of "digital watermarks" has emerged. The so-called "digital watermark" is some digital information added to the multimedia data, for example, the information of the producer will be added to the digital photo, and the information of the advertising company will be added to the digital video disc. Similar to the characteristics of ordinary watermarks, digital watermarks are almost invisible in multimedia data (such as digital photos) and are difficult to destroy. Therefore, digital watermarking is very promising in today's computer and Internet era.
Digital watermarking has become an effective means to solve the "copyright problem". Digital watermarking can be used to illustrate the situation in which data of digital products is copied, so as to control the data being copied or limit the number of copies, in order to achieve protection. For example, the secret digital watermark information in the CD data disk can conditionally control who can access the content in the CD disk. In this way, the copyright of the multimedia data is protected by tracking the digital watermark information in the multimedia data, which could not be realized many years ago.
Digital watermarking technology is also very useful for authenticity verification of packaging prints, such as red-headed documents issued by government departments. The traditional method of document authentication is to identify whether the paper, seal or steel stamp of the document meets the specifications and standards. The disadvantage is that regardless of the paper , Seals or stamps are easily forged. Especially for seals, although government departments have strict regulations on the management and production of seals, there is still a saying in the society that "one radish engraves one seal". This shows that the traditional method has very imperfections. Using digital watermarking technology can effectively solve this problem. Using digital watermark as an information carrier, some information is added to the red-headed file, so that the file not only has a seal or steel stamp, but also has difficult to detect digital watermark information, thereby greatly increasing the difficulty of forging the file.
We can see that digital watermarking has opened up a new way of information security. Its imperceptible concealment and ability to resist various attacks can achieve the integrity protection and tampering identification of digital products, and can also be used for digital anti-counterfeiting. Digital watermarking will surely become one of the core technical measures for copyright protection and authenticity authentication of digital works, and play an irreplaceable role in e-commerce transactions, which also indicates that digital watermarking has huge and broad market application prospects.
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