Towards a Better Robustness-Imperceptibility Tradeoff in Digital Watermarking
Robustness and imperceptibility are two essential but contradicting properties in robust digital watermarking. This paper proposes an approach for obtaining superior robustness-imperceptibility tradeoff by considering the likely set of attacks a watermark is expected to be mounted with. The suggested approach achieves this improvement by using Genetic Programming to develop appropriate perceptual shaping functions for structuring the watermark intelligently by choosing the optimum strength of allowable alteration in watermarkable DCT features, in view of a set of conceivable attacks. The developed perceptual shaping functions, which outperform the conventional ones, are generalized with respect to the cover work and are based on the watermark application.
KeywordsDigital Watermarking Genetic Programming Bit Correct Ratio and Structural Similarity Index
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