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Implementation method of anti printing and scanning meaningful digital watermark with large capacity

A technology against print scanning and digital watermarking, applied in image data processing, image data processing, instruments, etc., can solve the problems of difficult watermark information extraction, small watermark embedding capacity, limitations, etc., and achieve robustness against print scanning attacks. performance, improve the correct extraction rate, and shorten the correction time.

Inactive Publication Date: 2007-05-09
JILIN UNIV
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Problems solved by technology

No matter which method is used, before the watermark information is extracted, the image embedded in the watermark has been subjected to various attacks, the most serious and insurmountable attacks are the printing attack in the process of making the certificate, the scanning attack in the process of digitizing the certificate, and the geometric attack. These attacks lead to difficulties in extracting watermark information, which limits the wide application of digital watermark technology for document anti-counterfeiting
[0024] (2) The capacity of watermark embedding is small. The existing digital watermark technology used for certificate anti-counterfeiting, the embedded watermark information is usually 1-bit information or a random sequence, which can only detect the presence / absence of watermark

Method used

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  • Implementation method of anti printing and scanning meaningful digital watermark with large capacity
  • Implementation method of anti printing and scanning meaningful digital watermark with large capacity
  • Implementation method of anti printing and scanning meaningful digital watermark with large capacity

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Embodiment Construction

[0051] The present invention will be further described in detail with reference to the accompanying drawings and a preferred embodiment. The module referred to in the present invention is a combination of methods.

[0052] The present invention can be divided into watermark embedding process 001 and watermark extraction process 002. The embedding process 001 first uses a scanner or digital camera 1 to convert the analog image to be protected into a digital image, and then uses module 2 to preprocess the obtained digital image, and module 3 to generate a large-capacity digital watermark signal, the module 4 embeds a digital watermark, and finally uses a printer to output an analog image 5; the watermark extraction process 002 first uses a scanner or other image acquisition device 6 to scan and input the printed image containing digital watermark information, and the watermark image is converted from an analog form to a digital form 7. Then use the module 8 to preprocess the di...

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Abstract

The method comprises: 1) generating high capacity of digital watermarking signals 2) pre-processing the original image to be embedded with the watermark; 3) embedding watermark information; 4) processing the watermark image before extracting the watermark; 5) extracting the watermark; 6) enhancing the image watermark information. The invention features the following: 1) embedding binary image high capacity information that enhances the identifiability of watermark information; 2) having strong robustness of anti-print and anti-scanning that can be used in anti-fake of all certificates and prints; using Hausdorff-based distance geometric correction process, which can effectively correct all geometric attack to watermark signal in the print and scanning process such as rotation, scaling and translation.

Description

technical field [0001] The invention relates to the technical field of anti-counterfeiting and information security, and is a digital watermark technology capable of embedding large capacity and resisting printing and scanning attacks, which can realize information hiding and tracking in an open network environment. Background technique [0002] By consulting relevant materials and related patents, the following patents are mainly cited: [0003] Country name Patent publication number Publication date [0004] 1. United States 0,126,064 2006.07.15 [0005] 2. United States 6,983,056 2006.01.03 [0006] 3. United States 1,533,750 2005.05.25 [0007] 4. United States 0,056,700 2005.03.17 [0008] 5. United States 6,775,393 2004.08.12 [0009] 6. China CN1710577 2005.12.21 [0010] 7. China CN2681239 2005.02.03 [0011] 8. China CN1512438 2004.07.14 [0012] The development of modern science and technology has greatly improved the level of anti-counterfeiting te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/32G06T1/00
Inventor 王树勋葛云霞年桂君
Owner JILIN UNIV
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