An Adaptive Video Watermark Embedding and Extraction Method Based on ANOVA

A technology of video watermarking and variance analysis, which is applied in the fields of digital video signal modification, image communication, electrical components, etc., can solve the problems of poor transparency and large distortion of video frame images, and achieve the effect of large watermark capacity and good transparency.

Active Publication Date: 2021-09-17
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The spatial domain watermarking algorithm usually directly divides the video frame into blocks, which is easy to cause large image distortion and poor transparency of the video frame.

Method used

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  • An Adaptive Video Watermark Embedding and Extraction Method Based on ANOVA
  • An Adaptive Video Watermark Embedding and Extraction Method Based on ANOVA
  • An Adaptive Video Watermark Embedding and Extraction Method Based on ANOVA

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1 The video watermark is adaptively embedded into the high texture area of ​​the video frame, such as figure 1 As shown, the steps are as follows

[0037] (1) Calculate the contrast and image entropy of the received video key frame, if its contrast and entropy are lower than the preset empirical threshold, discard this frame; if it meets the requirements, go to the next step, and the test video key frame to be received is as follows: Figure 5 shown;

[0038] (2) decode and convert the video frame that meets the requirements to the YUV space, and extract the Y channel to obtain the grayscale image component;

[0039] (3) Carry out 4*4 intra-frame prediction based on H.264 to the extracted grayscale image, and calculate the prediction residual matrix;

[0040] (4) Calculate the variance of the prediction residual matrix, and generate the variance matrix of the prediction residual block;

[0041]

[0042]

[0043]

[0044] Among them, Height and Wid...

Embodiment 2

[0051] Example 2 as figure 2 As shown, the methods for extracting watermark mainly include:

[0052] (1) Calculate the contrast and entropy of the key frame of the received watermarked video. If the contrast and entropy are less than the preset empirical value, it is considered to be a low-texture frame without embedded watermark information. It is excluded and continues to calculate the next frame; if If it is greater than the preset experience threshold, it is considered that there is an embedded watermark and it is transferred to the next step;

[0053] (2) Directly locate the embedded sub-block of the watermark according to the received information and the watermark map;

[0054] (3) Perform DCT transformation on the 4*4 frame blocks containing watermark information through the watermark map, and extract the watermark information embedded in the DC coefficient, and finally restore the original binary watermark sequence through the private key;

[0055] (4) Carry out DCT i...

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Abstract

The present invention relates to an adaptive video watermark embedding method based on variance analysis, which comprises the following steps of calculating contrast and entropy for received video key frames, and discarding the frame if both the contrast and entropy are lower than a preset threshold; If it meets the requirements, go to the next step; extract the grayscale component of the key frame; perform 4*4 intra-frame prediction based on H.264 on the extracted grayscale image, and calculate the prediction residual matrix; calculate the variance of the prediction residual matrix, And generate the variance matrix of the video frame; according to the threshold th 1 and th 2 , divide the texture complexity of the video frame into low-texture regions S 0 , the highly textured region S 1 and higher texture regions S 2 ; Perform DCT transformation on the 4*4 video frame block in the high texture area, and embed the watermark information on the DC coefficient of the DCT. The embedding method adaptively embeds the watermark information in the high texture area of ​​the video frame, and transforms the invisibility and robustness of the domain watermark.

Description

technical field [0001] The invention relates to a watermark embedding and extraction method, in particular to an adaptive video watermark embedding method and extraction method based on variance analysis. Background technique [0002] In recent years, with the rapid development of artificial intelligence and Internet of Things technology, the transmission of images and videos has become more and more convenient. Due to the fast and convenient transmission of electronic products, in order to protect the owner's personal interests and prevent others from copying or being used by criminals , the importance of copyright protection is self-evident. Therefore, how to effectively and safely protect the copyright of multimedia electronic products is a hot topic in the field of information security at present. [0003] The rapid development of digital watermark technology provides an effective way for the copyright protection of multimedia electronic products. Digital watermarking ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/467H04N19/625H04N19/13
CPCH04N19/13H04N19/467H04N19/625
Inventor 常红霞严勤
Owner HOHAI UNIV
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