To improve the practicability of digital watermarking

watermarking imperceptibility and robustness must be ensured. Under the instruction of watermarking robust theory proposed by Cox et al

considering human vision system characteristics fully

a blind digital watermark method based on genetic algorithm is proposed. By adjusting coefficient difference based on edge detection in wavelet transformation domain

integrative optimization of watermarking imperceptibility and robustness is implemented. Experiment show that the method we proposed not only is robust to attacks

but ensures the quality of watermarking embed image.