Effect of Embedding Way on Printed Watermarking Image by Lithography

Aiming at a kind of holographic watermarking embedding algorithm based on DWT, the paper evaluates the robustness and hidden of watermark information through NC and PSNR, respectively. It intends to discuss the influence of embedding way at RGB color model to watermarked printing image. The experimental results show: while the watermark information is embedded into R channel, the extracted watermark after printing has better robustness. When the embedding strength α is equal to 1.0, the embedding channel has little influence on the robustness. When the color component of embedding channel is the maximum, the watermark after printing has good invisibility. However, the rule is abnormal that the hidden decreases with the increasing of the embedding strength through the comprehensive comparison, it could be found that the best embedding channel of RGB color mode is the one including the maximum color component. And the optimal embedding strength is 1.0.