Method for embedding and extracting strong robustness hologram watermark on the basis of DWT-SVD (Discrete Wavelet Transform-Singular Value Decomposition)

Abstract

The invention discloses a method for embedding and extracting a strong robustness hologram watermark on the basis of DWT-SVD (Discrete Wavelet Transform-Singular Value Decomposition). The method comprises the following steps: 1) carrying out transform on an original watermark image to generate a Fourier transform encryption hologram digital watermark, and carrying out singular value decomposition to obtain a singular value matrix; 2) carrying out channel separation on an RGB (Red Green Blue) colorful carrier image, carrying out second-level wavelet decomposition on a B component, and carrying out the singular value decomposition on a low-frequency coefficient matrix to obtain the singular value matrix; 3) embedding, multiplying the singular value matrix generated in the step 1) by an embedding coefficient K, embedding the obtained value into the singular value matrix generated in the step 2) through a gray level adding method, carrying out reduction and wavelet inverse transform on the generated singular value matrix, and combining channels to obtain the RGB colorful carrier image which contains the digital watermark; and 4) carrying out extraction, carrying out channel separation on the RGB colorful carrier image which contains the digital watermark, carrying out the second-level wavelet decomposition and the singular value decomposition to obtain the singular value matrix, subtracting the singular value matrix generated in the step 2) from the singular value matrix obtained in the step 4), dividing the obtained value by the embedding coefficient K, and carrying out the inverse transform to obtain original watermark information.

Description

technical field [0001] The invention relates to a digital watermark anti-counterfeiting technology, in particular to a DWT-SVD-based strong robustness holographic watermark embedding and extraction method. Background technique [0002] Encrypted holographic digital watermarking does not require the participation of the original carrier image, and the original watermark image can be extracted through the correct key. Fourier transform encrypted holographic digital watermark technology modulates the original digital watermark information through double random modulation templates, and generates Fourier transform encrypted holographic digital watermark through Fourier transform holographic technology. , shearing and other properties. [0003] At present, the embedding and extraction steps of encrypted holographic digital watermark are as follows: [0004] (1) Generation of encrypted holographic digital watermark: through double random phase modulation encryption technology an...

AI Technical Summary

Problems solved by technology

However, because the obtained digital watermark carrier image to be detected may be subjected to geometric attacks such as rotation, the watermark information cannot be extracted, and anti-counterfeiting authentication cannot be performed.

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