基于离散小波变换的数字水印技术

提出了一种基于小波分析的简单有效的数字水印嵌入和盲检测的算法。先将嵌入的水印信息加密，然后将加密后的水印信息嵌到相应DWT系数的有效嵌入位中，并使用适当的保真技术，减小图像因嵌入水印引起的失真。通过实验验证，该算法在对嵌入水印后的图像进行有损压缩、剪切、污染、添加各种噪声等处理后，提取出的水印仍表现出了较好的鲁棒性。

A digital watermarking technique based on DWT

A simple and efficient watermark technique based on the discrete wavelet transform is presented. The secret watermark information encrypted and embedded into the corresponding DWT coefficient's legal bit. A distortion reduction technique is used to enhance the fidelity of the image. The experiment result shows a good robust when attacked by JPEG loss compression, cropping, blurring noise added and so on.