Adaptive H.264 compressed domain video watermark embedding and extracting method
A technology for video watermarking and watermark extraction, applied in the field of information security, can solve the problems of image distortion, poor video adaptability, small motion vector amplitude, etc., to prevent the spread of errors, enhance robustness, and prevent frame scrambling. Effect
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[0043] Step 1: Expand and encode the watermark information to be hidden, and add a synchronization flag, specifically:
[0044] a) First convert the hidden information m into a binary bit sequence B;
[0045] B) scrambling the binary bit sequence B to obtain the scrambling bit sequence B';
[0046] c) Encoding the scrambled bit sequence B' to avoid the same bit stream as the synchronization flag;
[0047] The scrambling method is as follows:
[0048] For the existing N-bit one-dimensional watermark sequence A[0, 1, 2, ..., N-1], select the smallest positive integer P that is relatively prime to N, and the sequence B with a length of N is used to temporarily store the result .
[0049] Perform the following transformations:
[0050] a) B(i)=A((i×P)mod N), i=0, 1, 2,..., N-1
[0051] b) A=B
[0052] By repeating the above transformation multiple times, the one-dimensional sequence can be scrambled.
[0053] This scheme draws lessons from the method of the frame interval s...
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