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

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...

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