此系统可以根据量化系数的选择不同而使水印信号的脆弱程度不同。由实验结果显示假如Q＝1，当图像受到高斯噪声的攻击时，已经不能通过系统的认证。-system can quantify the different coefficients so fragile watermark signals to different degrees. From the experimental results show that if the Q = 1, when images by Gaussian nois

基于数字水印算法，包含多种攻击方法，同时兼有脆弱和鲁棒水印。-Based on digital watermarking system, which involves a variety of attack methods, while both fragile and robust watermark.