中文摘要：

基于图像多小波域低频系数子块的相似性，利用神经网络的学习特性，提出了新的盲数字水印算法．将宿主图像变化为多小波域，把水印加入到宿主图像多小波变化后的低频系数中．通过后向传播算法的神经网络训练出宿主图像与嵌入的水印信号之间的关系特征，利用神经网络具有学习和自适应的特性，训练后的神经网络能够完全恢复嵌入到宿主图像中的水印信息．仿真实验表明，该算法针对各种攻击具有很好的鲁棒性，特别是在水印检测时不需要原始图像．

英文摘要：

A novel blind digital watermarking algorithm based on neural networks and multiwavelet transform is presented. The host image is decomposed through multiwavelet transform. There are four subblocks in the LL- level of the multiwavelet domain and these subblocks have many similarities. Watermark bits are added to low- frequency coefficients. Because of the learning and adaptive capabilities of neural networks, the trained neural networks almost exactly recover the watermark from the watermarked image. Experimental results demonstrate that the new algorithm is robust against a variety of attacks, especially, the watermark extraction does not require the original image.