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Multi-bit Watermark Embedding using Dither Modulation

In this paper we investigate the use of four way dither modulation for high capacity watermark embedding and compare it with conventional approach of binary dither modulation. The embedding is performed in the invariant domain using Zernike moments as these moments provide minimum information redundancy, excellent resistance to noise and possess good image reconstruction capabilities. We have performed detailed experimentation to perform exhaustive comparative analysis of the two embedding methods in terms of visual imperceptibility and robustness to various geometric attacks as well as signal processing attacks.