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.
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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;
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[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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