Digital watermark embedding and extraction method based on chaos sequences

Abstract

The invention discloses a digital watermark embedding and extraction method based on chaos sequences. The digital watermark of the chaos sequences is used for carrying out scrambling, and the pertinence of the original watermark and the scrambled digital watermark is removed through the scrambling, so the digital watermark has the features like flat noise. Thereby, the transparency of the digital watermark is improved. The position of the watermark embedding into a DCT block is determined through the chaos sequences, the safety of the algorithm is improved, and better robustness on the large-area cutting attack can also be realized. In the watermark embedding process, firstly, image sub blocks carry out discrete cosine transform (DCT), and the energy can be converted into low-frequency factor compression blocks; and after the conversation, the obtained low-frequency component matrix A carries out singular value decomposition (SVD), and at the same time, the position of the watermark embedding into the DCT low-frequency compression blocks can be determined and the embedding intensity can be regulated through the chaos sequences. Thereby, the calculation complicity can be reduced, in addition, the embedding quantity is also increased, the robustness of the watermark is improved, and the capability is improved for resisting ordinary attack, so the invention has wider practicability.

Description

technical field [0001] The invention belongs to the technical field of multimedia information security, and more specifically relates to a digital watermark embedding and extraction method based on a chaotic sequence. Background technique [0002] In the field of multimedia information security technology, digital watermarking is an important research direction of information hiding technology. Digital watermarking technology refers to the use of signal processing methods to embed concealed identification information in digital multimedia information, including multimedia, documents, software and other carriers. This kind of mark is usually invisible and can only be detected by a special detector or reader. extract. Through the information hidden in the carrier, the purpose of confirming content creators, buyers, transmitting secret information, or judging whether the carrier has been tampered with can be achieved. [0003] When digital watermarking is applied to copyright...

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Problems solved by technology

[0008] However, the existing digital watermark embedding and extraction methods can only meet some requirements of practical applications, and have the following shortcomings:

[0012] In addition, the embedding position of the digital watermark is poor, and the extraction of the watermark depends on the original data. In many applications, the original carrier data cannot be determined, such as: searching for illegal copies of many images on the Internet, or there is no original data at all.

[0013] From the above, we can see that the existing digital watermarks have poor transparency, low security and robustness, and their anti-counterfeiting and anti-collision attack capabilities need to be improved.

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