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
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[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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