The cover image is not needed when extracting the watermarking data.The experiment results show that the algorithm has good robustness on image cut,JPEG and median filter.

• 实验结果表明,该算法对图像剪切、JPEG有损压缩、中值滤波等攻击有很强的鲁棒性,对旋转、噪声等攻击也具备了一定的抵抗能力。