Tampering prompt watermarks are fragile watermarks designed to identify the integrity and authenticity of the host signal. The purpose of covertly identifying watermarks is to hide important labels of confidential data and to restrict the use of illegal users.
According to the hidden position of the digital watermark, it can be divided into time (empty) domain, frequency domain, time/frequency domain, and time/scale domain digital watermark. The digital watermark in the time (empty) domain directly superimposes the watermark information in the signal space. The digital watermarks in the frequency domain, time/frequency domain, and time/scale domain hide the watermark in the DCT domain, the time/frequency domain, and the wavelet domain, respectively. .
According to the media attached to the watermark, it can be divided into images, audio, video, text, and a grid watermark for a three-dimensional grid model. With the development of digital technology, there will be more types of digital media, and corresponding watermark technologies will also be produced.
The application prospects of digital watermarking In recent years, digital watermarking technology has continued to expand into new applications. The application of anti-counterfeiting in printing is a new topic at present. Relevant information shows that about 500,000 people in the United States each year suffer from false or false documents, and directly or indirectly lose about 750 million U.S. dollars. Traditional anti-counterfeit watermarks have made it impossible for criminals to exploit the imperfect technology. Digital watermarking technology is another way to use digital signal processing related technologies to embed micro-data in media data works. After the watermark technology is embedded, the original media data does not change and does not affect the normal use of the original data. People cannot perceive watermarks from the surface and only detect them with a dedicated detector or software. It has a wide range of uses in various products such as printing and packaging, trademarks, invoices, cheques, security of securities, and digital media copyright protection.
At present, the digital watermarking technology used for copyright protection has entered a preliminary stage of practical application. IBM provides digital watermarking in its "digital library" software. Adobe also integrates Digimarc's digital watermarking plug-in in its famous Photoshop software. However, the digital watermarking products on the market are still technically immature and can be easily destroyed or cracked. There is still a long way to go before they are truly useful.
According to U.S. official reports, among the counterfeit banknotes valued at US$40 million intercepted in 1997 alone, the use of high-precision color printers to make counterfeit banknotes accounted for 19%. This figure was 9.05 times that of 1995. At present, the United States, Japan, and the Netherlands have all started to research digital watermarking technology for the security of bills. The MIT Media Lab, commissioned by the U.S. Department of the Treasury, has begun to study the addition of unique, invisible digital watermarks to each image output from color printers and copiers. , quickly handle authenticity.
The United States Digimarc Corporation first introduced the world's first commercial digital watermarking software, and later integrated the software into Adobe Photoshop and Corel Draw image processing software as a plug-in. Subsequently, it launched a series of digital watermark products. Its "Mediabridge" technology has opened up a new way to access the Internet by hiding invisible digital watermarks in magazine advertisements, product packaging, catalogues and even various types of bills. Users simply place these traditional media in front of a web camera. Media Bridge technology can take the user directly to the web site associated with the printed image content, eliminating the need for users to tap the keyboard and click the mouse. For example, before placing an advertising magazine in front of a webcam, Media Bridge Technology will display the information on the homepage of the advertising company and the products in the advertisement on the computer, eliminating the need to use a browser to search the web. "Brand protection" technology enables products to be identified at any point in the product's distribution chain by adding confidentiality features to product packaging designs, identifying original and duplicated versions, preventing product counterfeiting, and being able to track products through the supply chain. Circulation. The "Secure document" technology adds Digimarc's watermark features to important documents to confirm the authenticity of the document, prevent unauthorized copying of the document, and confirm the authorized application of the original document.
In the traditional business â–¡ e-commerce transformation process, there will be a large number of excessive electronic documents, such as scanned images of various paper bills, even after the network security technology matures, various electronic bills also need some non-cryptographic certification the way. Digital watermarking technology can provide invisible certification marks for various bills, which greatly increases the difficulty of counterfeiting.
Domestic research on digital watermarking is in the country. Researchers in relevant departments are stepping up research on anti-counterfeiting technology for digital watermark printing. For example, Dalian University of Technology has achieved fruitful results in digital watermark printing anti-counterfeiting technology. The technology can realize digital watermarking in the printed image, and can automatically detect the digital watermark in the printed image through the scanner and special software. This technology can adapt to various models of printers and scanners.
The development of digital technology and the Internet are changing the carriers and methods of cultural transmission. It is not enough to rely solely on traditional cryptographic techniques to complete data encryption, authentication, and protection. Digital watermarking has an irreplaceable role in terms of copyright identification, network security, hidden security, tamper-evidence, and data anti-counterfeiting. It will bring huge commercial profits to commercial, financial, military, and personal consumption.
It is believed that digital watermarking will play a huge role in social and economic development, and it can generate considerable economic benefits. It is imperative to develop independent core software and products as soon as possible so that China can be involved in related technologies in the face of opportunities and challenges in accession to the WTO. The research, application and industrialization process is in an invincible position.
According to the hidden position of the digital watermark, it can be divided into time (empty) domain, frequency domain, time/frequency domain, and time/scale domain digital watermark. The digital watermark in the time (empty) domain directly superimposes the watermark information in the signal space. The digital watermarks in the frequency domain, time/frequency domain, and time/scale domain hide the watermark in the DCT domain, the time/frequency domain, and the wavelet domain, respectively. .
According to the media attached to the watermark, it can be divided into images, audio, video, text, and a grid watermark for a three-dimensional grid model. With the development of digital technology, there will be more types of digital media, and corresponding watermark technologies will also be produced.
The application prospects of digital watermarking In recent years, digital watermarking technology has continued to expand into new applications. The application of anti-counterfeiting in printing is a new topic at present. Relevant information shows that about 500,000 people in the United States each year suffer from false or false documents, and directly or indirectly lose about 750 million U.S. dollars. Traditional anti-counterfeit watermarks have made it impossible for criminals to exploit the imperfect technology. Digital watermarking technology is another way to use digital signal processing related technologies to embed micro-data in media data works. After the watermark technology is embedded, the original media data does not change and does not affect the normal use of the original data. People cannot perceive watermarks from the surface and only detect them with a dedicated detector or software. It has a wide range of uses in various products such as printing and packaging, trademarks, invoices, cheques, security of securities, and digital media copyright protection.
At present, the digital watermarking technology used for copyright protection has entered a preliminary stage of practical application. IBM provides digital watermarking in its "digital library" software. Adobe also integrates Digimarc's digital watermarking plug-in in its famous Photoshop software. However, the digital watermarking products on the market are still technically immature and can be easily destroyed or cracked. There is still a long way to go before they are truly useful.
According to U.S. official reports, among the counterfeit banknotes valued at US$40 million intercepted in 1997 alone, the use of high-precision color printers to make counterfeit banknotes accounted for 19%. This figure was 9.05 times that of 1995. At present, the United States, Japan, and the Netherlands have all started to research digital watermarking technology for the security of bills. The MIT Media Lab, commissioned by the U.S. Department of the Treasury, has begun to study the addition of unique, invisible digital watermarks to each image output from color printers and copiers. , quickly handle authenticity.
The United States Digimarc Corporation first introduced the world's first commercial digital watermarking software, and later integrated the software into Adobe Photoshop and Corel Draw image processing software as a plug-in. Subsequently, it launched a series of digital watermark products. Its "Mediabridge" technology has opened up a new way to access the Internet by hiding invisible digital watermarks in magazine advertisements, product packaging, catalogues and even various types of bills. Users simply place these traditional media in front of a web camera. Media Bridge technology can take the user directly to the web site associated with the printed image content, eliminating the need for users to tap the keyboard and click the mouse. For example, before placing an advertising magazine in front of a webcam, Media Bridge Technology will display the information on the homepage of the advertising company and the products in the advertisement on the computer, eliminating the need to use a browser to search the web. "Brand protection" technology enables products to be identified at any point in the product's distribution chain by adding confidentiality features to product packaging designs, identifying original and duplicated versions, preventing product counterfeiting, and being able to track products through the supply chain. Circulation. The "Secure document" technology adds Digimarc's watermark features to important documents to confirm the authenticity of the document, prevent unauthorized copying of the document, and confirm the authorized application of the original document.
In the traditional business â–¡ e-commerce transformation process, there will be a large number of excessive electronic documents, such as scanned images of various paper bills, even after the network security technology matures, various electronic bills also need some non-cryptographic certification the way. Digital watermarking technology can provide invisible certification marks for various bills, which greatly increases the difficulty of counterfeiting.
Domestic research on digital watermarking is in the country. Researchers in relevant departments are stepping up research on anti-counterfeiting technology for digital watermark printing. For example, Dalian University of Technology has achieved fruitful results in digital watermark printing anti-counterfeiting technology. The technology can realize digital watermarking in the printed image, and can automatically detect the digital watermark in the printed image through the scanner and special software. This technology can adapt to various models of printers and scanners.
The development of digital technology and the Internet are changing the carriers and methods of cultural transmission. It is not enough to rely solely on traditional cryptographic techniques to complete data encryption, authentication, and protection. Digital watermarking has an irreplaceable role in terms of copyright identification, network security, hidden security, tamper-evidence, and data anti-counterfeiting. It will bring huge commercial profits to commercial, financial, military, and personal consumption.
It is believed that digital watermarking will play a huge role in social and economic development, and it can generate considerable economic benefits. It is imperative to develop independent core software and products as soon as possible so that China can be involved in related technologies in the face of opportunities and challenges in accession to the WTO. The research, application and industrialization process is in an invincible position.
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