Digital watermark anti fake method in anti-digital-to-analog conversion process

A digital watermarking and analog-to-digital conversion technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of inability to resist geometric attacks, analog-digital-to-analog attacks, inability to perform anti-counterfeiting in the analog domain, and difficult to design algorithms. To achieve the effect of anti-counterfeiting protection, overcoming geometric deformation, and resisting signal attenuation

Active Publication Date: 2007-06-20
TIANGU INFORMATION SCI TECH HANGZHOU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But now people mostly focus on the research of digital watermarking technology for digital images, audio and video, and there are few researches on digital watermarking algorithms that use documents and binary images as carriers. The difficulty in the design of the digital watermarking algorithm of the carrier is that the document or binary image can represent the entire image with only two different gray values. There are almost no textures and details, and some are just different geometric shapes. Using such It is difficult for the carrier to design an algorithm that meets the requirements of digital watermarking
However, documents and binary images are widely used, including digital signatures, handwritten signatures, text, etc. The research on its protection issues is of great significance from practice to theory, and now it can provide both the verification function of the digital domain and the There are few examples of anti-counterfeiting functions using documents and binary images as carriers after digital-to-analog and analog-to-digital conversion processing. General electronic encryption technology or digital watermarking algorithms only provide anti-counterfeiting functions in the digital domain for documents, and cannot resist geometric attacks and similar printing. Scanned modulus and digital-analog attacks cannot play an anti-counterfeiting function in the analog domain

Method used

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  • Digital watermark anti fake method in anti-digital-to-analog conversion process
  • Digital watermark anti fake method in anti-digital-to-analog conversion process
  • Digital watermark anti fake method in anti-digital-to-analog conversion process

Examples

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Embodiment 1

[0032] The entire embedding and detection process of the digital watermark anti-counterfeiting method against the digital-analog-to-analog conversion process can be subdivided into the following steps for description: a) pre-processing before watermark embedding; b) watermark embedding; c) possible transmission process of watermarked documents D) Pre-processing before watermark extraction; e) Watermark extraction decision. Figure 1 shows a) pre-processing before watermark embedding and b) watermark embedding process; Figure 2 shows the document transmission process protected by a digital watermark anti-counterfeiting method that resists the digital-to-analog-to-digital conversion process; Figure 3 contains d) preprocessing before watermark extraction Processing and e) Watermark extraction judgment; Figure 4 shows the corporate official seal without watermark information embedded, it is a corporate official seal customized according to the geometric size of the country, called the ...

Embodiment 2

[0063] The entire embedding and detection process of the digital watermark anti-counterfeiting method against the digital-analog-to-analog conversion process can be subdivided into the following steps for description: f) pre-processing before watermark embedding; g) watermark embedding; h) possible transmission process of watermarked documents ; I) Pre-processing before watermark extraction; j) Watermark extraction decision. Figure 11 shows f) preprocessing before watermark embedding and g) watermark embedding process; Figure 13 shows the possible transmission process of a document protected by a digital watermark anti-counterfeiting method that resists the digital-analog-to-analog conversion process; i) pre-watermark extraction Processing and j) The watermark extraction decision process is the same as that in Embodiment 1, as shown in Figure 3. Figure 9 shows the corporate official seal without embedded watermark information. It is a corporate official seal customized according t...

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Abstract

The method includes steps: (1) watermark algorithm is adopted in step of embedding watermark; binary digital watermark including special information is embedded in selected special region of object to be protected; (2) step for determining watermark picked up. Characters are that the special region includes foreground image and background image; halo process is carried out for fringe of the foreground image; synchronized signal reflecting geometric features of foreground image is setup before watermark is embedded. Information of watermark is represented by two defined different modes of image block. Watermark is extracted by comparing a decided threshold value with variance of pixel value of image block. Using relativity between extracted watermark and original watermark determines whether watermark is authentic. The invention partitions foreground image from background region so as to prevent original image from distortion. The invention resists attack of printing and scanning.

Description

Technical field [0001] The invention relates to a watermark anti-counterfeiting method, in particular to a digital watermark anti-counterfeiting method resisting the process of digital-to-analog-to-digital conversion. Background technique [0002] As a novel information hiding technology, digital watermarking provides a new solution to a series of problems on open networks, such as copyright protection, source authentication, tampering authentication, online distribution, user tracking, and identity authentication. However, most people now focus on the research of digital watermarking technology for digital images, audio and video. There are few researches on digital watermarking algorithms that use documents and binary images as carriers. Documents and binary images are used as the carrier. The difficulty in the design of the digital watermarking algorithm of the carrier is that the document or binary image can represent the entire image with only two different gray values. Ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 裘正定章春娥何一兵
Owner TIANGU INFORMATION SCI TECH HANGZHOU
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