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A multi-watermarking based on DWT and ICA

A new digital image multi-watermarking approach is proposed. Firstly watermark is synthesized by composing, conversion and scrambling of original multiple watermarks. Then watermark is embedded in middle frequency sub-bands of host image in wavelet domain, and the embedded intensity of watermark is determined adaptively by noise visibility function. Finally, extraction process adopts independent component analysis to recover watermark in middle frequency sub-bands of watermarked image. The experimental results show that this scheme has a good imperceptibility and robustness to compression attack of the popular watermark benchmarking software Checkmark.