Video watermark realizing method against geometric attack based on three-dimensional discrete cosine transform (DCT)

A technology of anti-geometric attack and implementation method, applied in the field of video watermarking based on 3D DCT anti-geometric attack, can solve problems such as still blank, and achieve the effect of strong anti-scaling and strong anti-conventional attack capabilities

Inactive Publication Date: 2012-06-20
HAINAN UNIVERSITY
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Problems solved by technology

[0005] In short, the method of embedding a digital watermark in the video that is resistant to geometric attacks such as rotation, scaling, translation, and shearing, and it is a zero watermarking technology, such research is still blank, and there is no public report

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  • Video watermark realizing method against geometric attack based on three-dimensional discrete cosine transform (DCT)
  • Video watermark realizing method against geometric attack based on three-dimensional discrete cosine transform (DCT)
  • Video watermark realizing method against geometric attack based on three-dimensional discrete cosine transform (DCT)

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Embodiment Construction

[0088] The present invention will be further described below in conjunction with accompanying drawing:

[0089] Use 1000 sets of independent binary pseudo-random sequences (the value is +1 or 0) each set of sequence length = 64bit, in these 1000 sets of data, we randomly select a set (here we choose the 500th set), as the embedding watermark sequence. A frame image of the original video is shown in Figure 1(a), which is taken from the first frame of the video (Shirley Temple.mat). In the experiment, the size of the video is 300x300x6), and the video is represented as F(i, j, k ), where 1≤i, j≤300; 1≤k≤6 corresponds to the 3D-DCT coefficient matrix FD(i, j, k), where 1≤i, j≤300; 1≤k≤6, considering Robustness and capacity of embedding watermark at one time We take 64 coefficients of low intermediate frequency (8x8x1=64), and the watermark is W(j), 1≤j≤64;. After detecting W' through the watermark algorithm, we judge whether there is a watermark embedded by calculating the norm...

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Abstract

The invention relates to a video watermark realizing method against geometric attack based on three-dimensional discrete cosine transform (DCT), which firstly embeds a watermark, and (1) global three-dimensional DCT conversion is carried out to an original video section, and a visual characteristic vector which resists geometric attack is extracted from a conversion efficient; (2) a binary logic sequence is worked out with the visual characteristic vector and the watermark to be embedded through a Hash function, and the binary logic sequence is stored in a third party, and the watermark is extracted; (3) the global three-dimensional DCT conversion is carried out to a tested video, and the characteristic vector of the video which resists geometric attack is extracted; and (4) the watermark is extracted with the characteristics of the Hash function and the binary logic sequence which is stored in the third party. The method,based on a three-dimensional DCT conversion video digital zero-watermark technology realizes the embedment of the watermark without affecting the video image, moreover the method has higher robustness and stronger attack resistant capability, and provides a powerful technical path for protecting the copyright of the video.

Description

technical field [0001] The invention belongs to the field of multimedia signal processing, and relates to a three-dimensional DCT-based video digital watermark technology, in particular to a three-dimensional DCT-based anti-geometric attack video watermark implementation method. Background technique [0002] With the rapid development of multimedia and Internet technology, people can download multimedia information on the Internet very conveniently, but the accompanying problem of copyright protection of multimedia data is also becoming more and more serious. While people conveniently transmit information through the Internet, it also provides convenience for the piracy of digital media on the Internet. Although traditional cryptography can solve secure transmission and access control, once the password is decrypted, digital media content can be copied, disseminated and tampered with at will. Therefore, how to make full use of the convenience of the Internet and effectively...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/30H04N19/467H04N19/625
Inventor 李京兵杜文才张怀强
Owner HAINAN UNIVERSITY
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