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Digital watermark imbedding and detecting method and device

A digital watermark and detection device technology, applied in the field of information security, can solve the problems of reducing watermark embedding capacity, watermark extraction quality, inability to resist compression and low-pass filtering, and inability to resist cropping attacks well, so as to increase watermark embedding capacity and avoid The effect of conjugate image mutual interference, concealment and robustness improvement

Active Publication Date: 2009-07-15
SHENZHEN ESUN DISPLAY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the past ten years, the optical holographic image itself has received extensive attention in digital watermarking schemes due to its indestructible characteristics, and it has effectively solved the problem that the existing general digital watermarking technology cannot resist cropping attacks well.
In 2002, Takai and Mifune first proposed holographic digital watermarking technology, and confirmed the introduction of holographic technology in the digital watermarking scheme, which brought a good ability to resist clipping attacks to the system. It is not resistant to attacks such as compression and low-pass filtering.
However, in the general digital watermarking scheme based on hologram technology, the decrypted image will be accompanied by the interference of the conjugate image, which will greatly reduce the capacity of watermark embedding and the quality of watermark extraction.

Method used

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  • Digital watermark imbedding and detecting method and device
  • Digital watermark imbedding and detecting method and device

Examples

Experimental program
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Effect test

example 1

[0134] Example 1: Image quality degradation after embedding a watermark in the carrier image

[0135] The example of the watermark scheme of the present invention adopts the grayscale image baboon (512×512×8) as the original carrier image; any logo image (64×64, binary) as the original watermark image. The embedding weight factor is selected as 0.8, and the watermarked image is obtained after embedding the watermark. At this time, the peak signal-to-noise ratio between the watermarked image and the original carrier image is as high as 43.2dB, the image quality remains intact, and the watermark is invisible visually. The correlation coefficient between the detected watermark image and the original watermark image reaches 1.0.

example 2

[0136] Example 2: Watermarked image detection after lossy compression

[0137] In the network environment, digital images generally need to be compressed before transmission. JPEG compression is a widely used compression method. Therefore, a feasible watermarking scheme must be able to detect correctly after a certain degree of JPEG lossy compression. Practical value.

[0138] The experiment carried out JPEG lossy compression with different ratios on the watermarked image. The results showed that when the compression ratio was as high as 15.20, the peak signal-to-noise ratio between the watermarked image and the original carrier image dropped to 35.3dB, and the detected watermarked image and the original watermarked image The correlation coefficient between them still reaches 0.75, which fully proves that the watermarking scheme has a strong ability to resist lossy compression.

example 3

[0139] Example 3: Watermarked image detection after cropping

[0140] In order to verify the ability of the watermarking system to resist the shearing operation, the experiment was tested for different shearing ratios. The results showed that when cutting 358×358 from the watermarked image (equivalent to 70% of the entire image), the watermarked image and the original carrier image The peak signal-to-noise ratio drops to 7.96dB, and the correlation coefficient between the detected watermark and the original watermark still reaches 0.75.

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Abstract

The invention discloses a method for inlaying a digital watermark, comprising step A1 of transforming a watermark image to generate a phase holographic image; step B1 of transforming a digital carrier image by means of wavelet; step C1 of synthesizing the phase holographic image after being weighted with a wavelet low-frequency coefficient obtained by transforming a digital carrier image by means of wavelet; step D1 of inversely transforming the synthesized wavelet low-frequency coefficient to generate an image having a watermark. The invention also discloses a corresponding digital watermark detecting method and a digital watermark inlaying and detecting device used to implement the inlaying and detecting method. Compared with the prior digital watermark method, concealment and robustness of the invention are obviously improved. Furthermore, the invention has the shear resistance of the holographic watermark scheme and avoids problem of interference between conjugate images.

Description

technical field [0001] The invention relates to the field of information security, in particular to a digital watermark embedding and detection method and device based on kinoform and wavelet transform. Background technique [0002] The development and popularization of Internet technology has made the dissemination of digital audio-visual products (images, sound signals, etc.) and other electronic publications more and more convenient. But the ensuing infringement and piracy activities are also becoming more and more rampant. How to carry out digital media intellectual property protection has been paid more and more attention by people. Although encryption technology has long been widely used to prevent illegal access to digital content, encrypted data can only be read by authorized persons, which limits the dissemination and application of protected works to a certain extent, and once decrypted, it is completely placed on the decryption Under human control, the original ...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 彭翔祁永坤关颖健
Owner SHENZHEN ESUN DISPLAY
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