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Method for embedding large watermark in video based on three-dimensional wavelet and cosine transformation

A technology of cosine transform and wavelet transform, which is applied in the fields of digital video signal modification, television, selective content distribution, etc. It can solve the problems of difficult implementation, and achieve the effect of wide application range, strong anti-geometric attack ability, and good compatibility.

Inactive Publication Date: 2012-02-01
HAINAN UNIVERSITY
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Problems solved by technology

Embed a large-capacity watermark in digital video based on 3D wavelet transform, and require the embedded large-capacity watermark to have strong resistance to geometric attacks.

Method used

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  • Method for embedding large watermark in video based on three-dimensional wavelet and cosine transformation
  • Method for embedding large watermark in video based on three-dimensional wavelet and cosine transformation
  • Method for embedding large watermark in video based on three-dimensional wavelet and cosine transformation

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Embodiment Construction

[0083] The present invention will be further described below in conjunction with accompanying drawing.

[0084] First generate 1000 sets of independent binary pseudo-random sequences (values ​​are +1 or 0) each set of sequence length is 64bit, in these 1000 sets of data, select three sets as a large watermark to be embedded, each set as a sub The watermark has a sequence length of 64 bits, so the total length of the large watermark is: 64x3=192 bits. In the experiment, the 300th, 500th, and 700th random sequences are used as the embedded large watermark sequences with a total length of 192 bits. The size of the video used in the experiment is 300x300x6, and the original video is expressed as F(i, j, k), where 1≤i, j≤300; 1≤k≤6, and the corresponding coefficient matrix of the three-dimensional DWT-DCT transformation is DF( i, j, k), considering the robustness and the capacity of one-time embedding watermark, select 8x8x1=64 coefficients of medium and low frequency as the featur...

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Abstract

The invention relates to a method for embedding a large watermark in video based on three-dimensional wavelet and cosine transformation, which comprises the steps of 1, carrying out three-dimensional wavelet transformation and three-dimensional overall cosine transformation on original video data, extracting a geometric attack resistant characteristic vector from a transformation coefficient; 2, dividing the large watermark into a plurality of sub watermarks, then carrying out Hash function operation on the characteristic vector of the video data and the sub watermarks to be embedded to obtain a corresponding binary logic sequence, and storing the binary sequence into a third party, and then carrying out watermark extraction; 3, carrying out three-dimensional wavelet transformation and three-dimensional overall cosine transformation on video data to be tested, extracting the characteristic vector of an object to be tested; and 4, extracting a plurality of sub watermarks by using the characteristics of an Hash function and the binary logic sequence stored in the third party. The method is used for extracting the watermarks under the condition that the original video is not influenced, has stronger robustness and protects the copyright of the video.

Description

technical field [0001] The invention belongs to the field of multimedia signal processing, and relates to a method for embedding large-capacity digital watermarks in video based on three-dimensional wavelet transform (3D-DWT) and three-dimensional cosine transform (3D-DCT), specifically a method based on three-dimensional wavelet and cosine Transform the method of embedding large watermarks in videos. technical background [0002] With the rapid development of multimedia technology and Internet technology, various digital media such as text, image, sound, video, etc. can be quickly and conveniently transmitted and downloaded through the Internet, and informatization has brought great convenience to people's lives; but At the same time, this also makes the piracy of such information very easy. [0003] Digital watermarking is an effective means to realize the copyright protection of digital works. Therefore, this technology has become a research hotspot in the field of mult...

Claims

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Application Information

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IPC IPC(8): H04N7/30H04N21/8358H04N19/467H04N19/63
Inventor 李京兵杜文才魏应彬
Owner HAINAN UNIVERSITY
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