Wavelet domain-based method for weighting fractional differential image digital watermark
A technology of fractional differentiation and digital watermarking, which is applied in the field of information security, can solve problems such as processing influence, high-frequency coefficients are susceptible to external noise, and poor security, and achieve the effect of improving security and anti-attack performance
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[0029] refer to figure 1 , the watermark scrambling and watermark embedding steps of the present invention are as follows:
[0030] Step 1, using fractional order Cauchy formula for sinusoidal signal f(t)=sin(ω 0 t) carry out m 1 and m 2 order differential 01 2 <1.
[0031] The fractional-order Cauchy formula is a direct extension of the simple integer-order differential formula:
[0032] D m f ( t ) = Γ ( m + 1 ) 2 πj ∫ C f ( τ ) ( τ - t ) m + ...
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