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Realization Method of Reversible Digital Watermarking in Encrypted Domain Using Most Significant Bit

A most significant bit, digital watermarking technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as restricting the application of reversible digital watermarking in the encryption domain

Active Publication Date: 2017-12-08
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And some are not completely reversible, that is, the original image can be restored correctly only under certain conditions
This greatly limits the application of reversible digital watermarking technology in the encrypted domain.

Method used

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  • Realization Method of Reversible Digital Watermarking in Encrypted Domain Using Most Significant Bit
  • Realization Method of Reversible Digital Watermarking in Encrypted Domain Using Most Significant Bit
  • Realization Method of Reversible Digital Watermarking in Encrypted Domain Using Most Significant Bit

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Embodiment 1

[0069] The schematic diagram of the implementation principle of the encrypted domain reversible digital watermarking method using the most significant bit to complete the digital watermark embedding provided by the embodiment of the present invention is as follows figure 1 As shown, it includes four parts: image preprocessing, image encryption, digital watermark information embedding, digital watermark information extraction, image decryption and recovery. The specific processing flow is as follows: figure 2 As shown, the following processing steps are included:

[0070] Step S210, select N pixels from the specified position in the pixel matrix of the original image, respectively extract the M most significant bits of each pixel in the N pixels to obtain a code stream, compress the code stream to obtain auxiliary information, and convert the auxiliary information Embedded in the pixel matrix of the original image.

[0071] Before encryption, the image is preprocessed to embe...

Embodiment 2

[0132] In order to effectively illustrate the performance of the present invention, the following uses the accompanying drawings and table data to display and analyze the experimental results to prove that the present invention has excellent performance.

[0133] For example, Attached Table 1 shows the size of the auxiliary information AI obtained after lossless compression of the code stream Code using arithmetic coding under different M values. Through the analysis of the compression results in Table 1, it can be seen that, in general, the most significant bits of the pixels of the image have a strong correlation, which can be compressed by the lossless compression algorithm, thereby effectively reducing the auxiliary The size of the information. The variation curve of the PSNR-embedding rate of a directly decrypted image such as an image baboon, an image barbara, etc. provided by Embodiment 2 of the present invention is as follows: Figure 9 As shown, for the image baboon,...

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Abstract

An embodiment of the present invention provides a method for implementing a reversible digital watermark in an encrypted domain using the most significant bit. The method mainly includes: selecting N pixels from specified positions in the pixel matrix of the original image, and extracting M most significant bits of each pixel, and form all the most significant bits into a code stream; compress the code stream to obtain auxiliary information, and embed the auxiliary information into the pixel matrix of the original image; use encryption The key encrypts the original image embedded with auxiliary information to obtain an encrypted image, obtains the corresponding pixels of the N pixels in the pixel matrix of the original image in the pixel matrix of the encrypted image, and the corresponding pixels in the corresponding pixels A digital watermark is embedded in the M most significant bits. The embodiment of the present invention embeds the digital watermark by using the most significant bit of the pixel, effectively reducing the additional information, and finally effectively improving the embedding capacity of the digital watermark.

Description

technical field [0001] The invention relates to the technical field of media communication, in particular to a method for realizing a reversible digital watermark in an encryption domain using the most significant bit. Background technique [0002] With the continuous progress and development of information technology and digital multimedia technology, the dissemination and use of multimedia works such as video, audio and images on the Internet has become more and more convenient and rapid. However, the characteristics of multimedia works that are easy to be tampered and copied make them widely used by criminals, and a large number of pirated works appear, which seriously infringes the interests of the authors of multimedia works. In addition, in the traditional method of protecting information security, encryption technology is an effective way. However, the encrypted information is easy to attract the attention of hackers. In this case, the encrypted data is in danger of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 倪蓉蓉赵耀刘瑞
Owner BEIJING JIAOTONG UNIV