Zero watermark generation method and system and zero watermark extraction method and system

Abstract

The invention discloses a zero watermark generation method and system and an extraction method and system. The zero watermark generation method comprises the following steps: obtaining a carrier imageand a watermark identification image; Carrying out primary blocking on the carrier image to obtain a plurality of small blocks; Performing curvelet transformation and discrete wavelet transformationon each small block in sequence to obtain a plurality of wavelet transformation images; Performing secondary partitioning on each wavelet transform image to obtain a plurality of sub-blocks; Performing singular value decomposition on the plurality of sub-blocks corresponding to each wavelet transform image to obtain a singular value matrix of each sub-block; Obtaining a binary feature matrix corresponding to the wavelet transform image according to the singular value matrix; Constructing set mapping of watermark identification images; Extracting watermark information of the watermark identification image according to the set mapping; And generating a zero watermark according to the binary feature matrix and the watermark information. The copyright protection of the carrier information canbe realized under the condition that the copyright identifier is not embedded, and the robustness and the stability of the zero watermark can be improved.

Description

technical field [0001] The invention relates to the technical field of digital watermarking, in particular to a zero watermark generation method and system, and an extraction method and system. Background technique [0002] With the rapid development of information technology, digital information is becoming more and more abundant, such as text, audio, image, video, etc., which makes data storage and transmission more convenient and faster, but many criminals use information technology to tamper with images and Graffiti, etc., lead to the lack of protection of the copyright of image information. Therefore, copyright protection has become the focus of research on digital information. As a copyright protection technology, digital watermarking can effectively solve the problems of copyright protection and content authentication, and is of great significance to the research of digital information copyright protection. [0003] The existing digital watermarking technology is mai...

AI Technical Summary

Problems solved by technology

It has good resistance to rotation attacks, but the disadvantage of this algorithm is that it does not perform well for JPEG compression.

4) Robust image zero watermarking based on Bessel Fourier moments, the algorithm has good robustness to geometric transformation, but for combined attacks, the resistance performance needs to be further improved

5) A new zero-watermark scheme is proposed using QR codes as watermark images. The QR code used has good security, but when the recognition area of ​​the QR code is attacked, it is difficult to extract copyright information

The above methods do not consider the instability of the information after the low-frequency information is divided into blocks, and the direct XOR operation of the copyright watermark and the feature matrix will affect the robustness of the algorithm. Therefore, the stability and robustness of the generated zero watermark are relatively low. Difference

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