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A digital watermarking method and device against geometric scaling attacks

A digital watermarking and geometric technology, applied in the field of information security, can solve the problems of small capacity and cannot meet the capacity requirements of embedding complex watermark information, etc., achieve the effect of small capacity, overcome the loss of watermark synchronization information, and good robustness

Active Publication Date: 2022-05-13
HUNAN UNIV OF FINANCE & ECONOMICS
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Problems solved by technology

Although there are some solutions to anti-geometric attacks, the current anti-geometric attack solutions generally have the problem of low capacity and cannot meet the capacity requirements of embedding complex watermark information. Therefore, it is necessary to design a watermark that can resist geometric attacks and has a certain hidden capacity digital watermarking method

Method used

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  • A digital watermarking method and device against geometric scaling attacks
  • A digital watermarking method and device against geometric scaling attacks
  • A digital watermarking method and device against geometric scaling attacks

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Embodiment

[0097] The following Table 1, Table 2, Table 3, Table 4 and Table 5 are 512×512 figure 2 The standard test image Lena.jpg shown, the DCT coefficients in the front 8 rows and 8 columns of the DCT transform domain coefficient matrix when the image is enlarged to 110%, 150%, 200% and 300% of the original image.

[0098] Table 1 Data of the first 8 rows and 8 columns of the DCT transform domain coefficient matrix of the Lena.jpg image (×1.0e+04)

[0099]

[0100]

[0101] Table 2 When the Lena.jpg image is enlarged to 110% of the original image, the data in the first 8 rows and 8 columns of the DCT transform domain coefficient matrix (×1.0e+04)

[0102] 6.8991 -0.5743 -0.1337 0.5441 0.4600 -0.2524 -0.0679 0.2240 0.3896 0.4272 -0.3585 -0.1330 -0.1283 0.1781 0.0783 -0.1203 -0.0126 0.1723 -0.3274 0.4418 -0.3125 0.5545 0.0156 -0.0703 -0.0935 -0.0956 0.4252 -0.3119 0.0661 0.1891 -0.3748 0.1683 -0.1375 0.1155 0.1162 0.1287 ...

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Abstract

The invention discloses a digital watermarking method and device resistant to geometric scaling attacks. The method includes: embedding digital watermark information into an original image to obtain a watermarked original image containing digital watermark information, and compressing the watermarked original image by 1 / z The scaled image is obtained by the scaling process; the size data of the original image is preprocessed and embedded into the DCT low-frequency AC coefficient of the scaled image, and then the obtained image embedded with the size data is scaled by z times to obtain the released image; For published images suspected of being attacked by geometric scaling, the size data of the original image is extracted from its DCT low-frequency communication coefficient; for published images suspected of being attacked by geometric scaling, scale them according to the extracted original image size to obtain the same size as the original image A geometric scaling attack restored image with consistent size; digital watermark information is extracted from the geometric scaling attack restored image. The invention can effectively suppress the geometric scaling attack and has good robustness.

Description

technical field [0001] The invention relates to the field of information security, in particular to a digital watermarking method and device for resisting geometric scaling attacks. Background technique [0002] Today, with the maturity of network technology, the superiority of digital resources is fully reflected, copying becomes easier, and the cost is extremely low. The high-speed and convenient Internet has become an important way to obtain digital resources. In order to meet the needs of digital resources, various digital resources such as images, graphics, audio and video have been gradually digitized. However, digital resources are not only convenient for people to use, but also provide convenience for pirates. At present, digital watermarking technology and digital fingerprinting technology are widely used to protect digital works such as digital images, graphics, audio and video. Among them, digital watermarking has been widely studied as an important technology for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00G06T3/40
CPCG06T1/0021G06T3/4084G06T1/005
Inventor 谢建全屈喜龙彭慧古今杰李博刘胜宗
Owner HUNAN UNIV OF FINANCE & ECONOMICS
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