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To link patterns and information anisotropy are introduced for the watermark embedding pattern and a four-level embedding pattern¡¡𝑝𝑖(i=0,1,2,3) and a marker pattern H are generated by filtering. At this time, a random number pattern with the embedder's ID as the seed value is used as the initial value for filtering . The obtained pattern pi shows the green noise characteristics shown in Figure , and different patterns can be obtained by changing the seed value. The ID pattern can be regarded as a two-dimensional pattern, such as a fingerprint unique to the copyright holder. The pattern is stored as a secret key ¡®Key (M)¡¯, and the watermark can be removed, appended, or rewritten as required. 4-level patterns are mapped to an embedding code, which is a Gray Code with a Hamming distance of 1.
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IEEE/ICACT20220093 Slide.10
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