SIFT (Scale-Invariant Feature Transform)-based geometric-attack-resistant robust video watermarking method

An anti-geometric attack, video watermarking technology, applied in image data processing, instruments, electrical components, etc., can solve the problem that the cryptographic technology no longer has a protective effect, and achieve a clear embedding and extraction process, low computational complexity, and implementation. simple effect

Inactive Publication Date: 2014-01-01
深圳市千方航实科技有限公司
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Problems solved by technology

[0003] The traditional means of copyright protection is password authentication technology. Cryptography technology can ensure the information security of digital works during the transmission process from the sender to the recipient. replication of

Method used

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  • SIFT (Scale-Invariant Feature Transform)-based geometric-attack-resistant robust video watermarking method
  • SIFT (Scale-Invariant Feature Transform)-based geometric-attack-resistant robust video watermarking method
  • SIFT (Scale-Invariant Feature Transform)-based geometric-attack-resistant robust video watermarking method

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Embodiment Construction

[0049] Such as figure 1 , 4 As shown, the present invention includes two parts of watermark embedding and watermark extraction.

[0050] The flow chart of the watermark embedding process is shown in image 3 , the steps are as follows:

[0051] Step 1: For each frame of video data, first convert to the Ycbcr color space and extract the Y component. If the original video is in yuv format, the Y component can be directly extracted.

[0052] Step 2: Perform two-dimensional discrete wavelet transform on the Y component, the wavelet base is Haar wavelet, and extract low frequency components.

[0053] Step 3: First divide the video into reasonable segments according to the size of the watermark information and the number of video frames. Assuming that the number of watermark information bits is m and the number of video frames is n, you can choose a number k that is an integer less than n / m, and then every k A frame is regarded as a segment. In order to facilitate processing when ...

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Abstract

The invention relates to an SIFT (Scale-Invariant Feature Transform)-based geometric-attack-resistant robust video watermarking method. A watermark embedding process comprises the following steps: (1) representing video frame images by Ycbcr, carrying out one-layer two-dimensional DWT (Discrete Wavelet Transform) on Y components of the images, and selecting harr wavelets as wavelet bases, thus obtaining low-frequency components after DWT; (2) taking n frames as a group, carrying out SIFT feature point extraction on the low-frequency components obtained in the step (1) of a first frame of each group, and recording the positions of obtained feature points; (3) adding a variable decided by watermark information to a pixel value of each feature point; (4) carrying out inverse DWT so as to obtain watermark embedded Y components, and transforming to an RGB (Red/Green/Blue) space from the Ycbcr, thereby completing watermark embedding. A watermark extracting process comprises the steps of carrying out steps (1) and (2) which are the same as the steps (1) and (2) of the embedding process, then, predicting pixel values of feature points according to surrounding pixels so as to obtain predicted difference values, and comparing the predicted difference values with a set threshold value, thereby obtaining embedded watermark information. The SIFT-based geometric-attack-resistant robust video watermarking method has the advantages that the robustness of video watermarking methods to geometric attacks is improved, the distortion is little, and the processing is simple.

Description

technical field [0001] The invention relates to a robust video digital watermarking method, in particular to a robust video watermarking method against geometric attacks based on SIFT (Scale-invariant feature transform). Background technique [0002] As we all know, digital multimedia has replaced the traditional analog form. With the continuous development of Internet communication technology, digital multimedia can be copied and disseminated conveniently and quickly, and the piracy and copyright disputes caused by this have become increasingly serious social problems. According to an estimate by the Recording Industry Association of America, the annual economic loss caused by piracy in the world is as high as 5 billion US dollars, and the American Film Industry Association estimates that piracy reduces the annual income of the US film industry by 2.5 billion US dollars. [0003] The traditional means of copyright protection is password authentication technology. Cryptograp...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/8358G06T1/00
Inventor 李清广陈真勇徐周川王美娟熊璋
Owner 深圳市千方航实科技有限公司
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