208 Optimized Watermarking Algorithm Based on the Zero Tree Structure of Wavelet Transform

Based on an optimized perceptual model of the zero tree structure, propose one watermarking algorithms,which embeds a watermark of Gaussian sequence, and the blind detector is based on correlation. In order to maximum embedding watermark bits, the two proposed algorithms embed watermark bits in all of the significant wavelet coefficients, including the coefficients of lowest pass sub-band, and provide a good tradeoff between the transparency and the robustness of watermarks based on the perceptual model. Experiments show that the proposed algorithms is effective and robust to common image processing operations, especially to JPEG and wavelet compression.