Wavelet domain-based method for weighting fractional differential image digital watermark

Abstract

The invention provides a wavelet domain-based method for weighting a fractional differential image digital watermark, which mainly solves the problem that the high-frequency coefficient of an image undergoing wavelet decomposition is susceptible to extraneous noises and conventional image processing. The method comprises the implementation steps of: doing two different orders of differentials for a sinusoidal signal by utilizing a fractional order Cauchy formula; respectively carrying out discrete sampling and superposing by utilizing a given weight to generate a pseudorandom sequence and adding the pseudorandom sequence with a watermark pixel value to realize watermark scrambling; carrying out two-stage decomposition on a carrier image by utilizing a Haar wavelet and embedding the scrambled watermark information in the carrier image through the exchanged and decomposed high-frequency coefficient; and through comparing the high-frequency coefficient undergoing the two-stage decomposition by utilizing the Haar wavelet, extracting the scrambled watermark and subtracting the pseudorandom sequence to realize watermark recovery. The method provided by the invention has the advantages of strong anti-attack ability and good safety of the image, and can be applied to copyright protection, restriction of illegally spreading audiovisual products, individual privacy protection, identification hiding and high-tech crime prevention.

Description

technical field [0001] The invention belongs to the field of information security, and relates to a digital watermarking method, which can be used in technologies in various fields such as copyright protection, restriction of illegal dissemination of audio-visual products, medical safety, protection of personal privacy, concealment of marks, authentication, and prevention of high-tech crimes. Background technique [0002] With the development of information technology, the problem of information security is becoming more and more prominent, and people pay more and more attention to copyright protection and other issues. Mature cryptography can solve secure transmission and access control, but once decrypted, digital media content can be copied and disseminated at will, which is the problem of super-distribution of digital media content, which has caused huge losses to media content manufacturers , thus restricting the progress of digital multimedia applications. The traditi...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of poor security in the prior art, and propose a weighted fractional differential image digital watermarking method based on the wavelet domain to solve the problem that the high-frequency coefficients of the image after wavelet decomposition are easily affected by external noise and conventional image processing The shortcomings of the image improve the anti-attack performance of the image

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