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Influence of different color space on digital watermarking for anti-counterfeiting printed images

The color space transformation in the process of print-and-scan is one of the challenging issues in applying digital watermarking technology to anti-counterfeiting printings. This paper adopted a digital holographic watermarking algorithm in DWT, and tested its performance in different color space, to study the influence of different color space for applying digital watermarking technology to anti-counterfeiting printings. Experiments shown that the algorithm we used was equipped the robustness against the print-and-scan attack, and the watermark embedded into one channel diffused to other channels and reduced the quality of extracted watermark. Furthermore, the watermark can be gain from each channel of watermarked image suffered from print-and-scan attack, though we only embedded watermark into one channel, but the quality of watermark extracted from each color channel of was decreased more or less.