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For a practical additive spread spectrum watermarking scenario, a is usually not determined arbitrarily, but it is based on the Data-to-Watermark (DWR) ratio, expressed in decibel (dB), where the term data refers to the coefficients used for embedding in one specific NSCT subband, which is determined by the energy distribution.
Spread spectrum watermarking: Malicious attacks and counterattacks, In: Proc.
[1] I.J.Cox, J.Kilian, T.Leighton and T.Shamoon, "Secure spread spectrum watermarking for multimedia", IEEE Trans.

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