Multi-channel filter group-based multifunction digital watermark method
A multi-functional watermarking and filter bank technology, applied in the field of information security, can solve the problems of single function and cannot realize blind extraction, and achieve the effect of reducing interference and flexible subband selection.
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[0066] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0067] The steps of the present invention are as follows (the principle block diagram sees accompanying drawing 1):
[0068] Embedding steps
[0069] (1) Use the M channel analysis filter bank to decompose the original image into M 2 sub belt;
[0070] (2) Scramble the copyright information to be embedded to generate a robust watermark; from M 2 Select a low-frequency sub-band from the sub-bands, and embed the robust watermark in the low-frequency sub-band with an appropriate robust watermark embedding algorithm;
[0071] (3) Generate a fragile watermark according to the low-frequency sub-band information of the image, and embed the fragile watermark in the low-frequency sub-band;
[0072] (4) Synthesize each sub-band into a watermarked image by using the corresponding M-channel synthesis filter bank.
[0073] extraction step
[0074] (1) Use the ...
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