小波域半盲数字水印算法

提出一种新的小波域半盲数字水印算法：首先对图像进行小波分解，然后使用尺度交互式特征检测模型(Scale interaction model for feature detection)提取逼近子图的特征点，并由特征点构造相应的小波域特征树，最后在特征树的所有节点中嵌入二值水印信息。根据特征点的位置信息可以有效地提取水印序列。由于水印信息被嵌入到图像的特征之中，故对JPEG，JPEG2000以及高斯白噪音等多种处理具有较强的鲁棒性，是一种新型的第二代水印算法。

A Novel Semi-blinding Watermarking Algorithm in the Wavelet Domain

A new semi-blinding watermarking algorithm in wavelet domain is proposed in this paper. The original image is first decomposed in wavelet domain, then the feature points are extracted from the lowest approximation with the scale interaction model for feature detection and the image feature tree in wavelet domain is created corresponding to the feature points. The binary watermark bits are embedded in all the nodes of the feature tree. Watermark extraction only needs the feature points position but not the original image. Since the watermark bits are inserted into the features of image, it is robust to common image processing, especially to the lossy compression such as JPEG, JPEG2000 and Gaussian noise. It belongs to the second generation watermarking schemes.