Robust image watermarking method based on quantum random walk and discrete wavelet transform

A discrete wavelet transform and random walk technology, applied in the field of information security, can solve the problem of low difficulty in decryption

Pending Publication Date: 2022-03-11
BEIJING UNIV OF TECH
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  • Robust image watermarking method based on quantum random walk and discrete wavelet transform
  • Robust image watermarking method based on quantum random walk and discrete wavelet transform
  • Robust image watermarking method based on quantum random walk and discrete wavelet transform

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[0032] The present invention will be described in more detail below with reference to the accompanying drawings, so that the purpose, technical solutions and advantages of the present invention will be more clearly understood. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0033] In the present invention, the M×N carrier image is represented by I, and the m×n watermark image is represented by W. Among them, M and N are the length and width of the carrier image, and m and n are the length and width of the watermark image.

[0034] refer to figure 1 ,Such as figure 1 Shown is the pre-encryption process based on the QRW system of the present invention.

[0035] The initial parameters of the two-particle QRW system on the ring of x nodes are used as the key.

[0036] In the whole process, firstly, the watermark image W with the size of m×n is scrambled and encrypted by t...

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Abstract

The invention discloses a robust image watermarking method based on quantum random walk and discrete wavelet transform, and aims to improve robustness and select to embed watermarks in a frequency domain. The discrete wavelet transform has the advantages that the discrete wavelet transform has good discreteness and spatial locality; important information in the image is compressed through discrete cosine transform, and the important information is concentrated and stepwise on the upper left portion of a coefficient matrix. The SVD coefficients provide high robustness, visual quality, and data payload. Second-level discrete wavelet transform is applied to a carrier image, and watermark embedding is completed in a high-frequency coefficient HH2 of the carrier image, so that the robustness of the watermark is ensured, and better visual quality of the carrier image is kept. After 2-DWT is carried out on a carrier image, the carrier image is divided into blocks, DCT operation is carried out on each block, and main energy of the image is further extracted. In order to not influence the visual quality as far as possible, the watermarking is embedded in the alternating current coefficient, and the watermarking is embedded into the singular value of the block by performing singular value decomposition on the watermarking.

Description

technical field [0001] The invention relates to the field of information security, in particular to a watermark security technology, in particular to a robust image watermark method based on quantum random walk and discrete wavelet transform. Background technique [0002] Today, the storage and secure transmission of data information is an important challenge. The emergence of cryptography provides convenience for information encryption, but on the one hand, encryption algorithms cannot protect information security after being attacked and cracked, and on the other hand, they do not take advantage of the signal properties of the information itself, so information hiding technology emerged. Information hiding is to hide the secret information to be transmitted in some communication carriers. Secret information is generally further encrypted with a key. Even if an attacker obtains the secret information, it cannot be decrypted due to the uncertainty of the key, which has good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06T5/10
CPCG06T1/005G06T5/10G06T2207/20064G06T2207/20052
Inventor 霍丽文杨宇光
Owner BEIJING UNIV OF TECH
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