一种新的图像水印方案

目标区域是图像中视觉上最重要的部分。针对现有的水印算法很少考虑图像中确定的目标区域这一问题，提出了一种基于目标区域的水印方案(WIOR)。方案首先利用小波变换分析图像的目标特征，并依据图像的小波高频系数特征对其进行聚类，获得水印的嵌入域，在此嵌入域中，选择小波系数并对其进行量化调制来嵌入二值扩谱水印；同时，通过只在图像的局部区域内嵌入较少的水印信息来改善水印的隐蔽性。实验结果表明，该方案对于一类具有突出目标特征的图像具有较好的效果。嵌入的水印主要优势在于真正把水印嵌入图像的视觉重要部分，从而能有效地抵御剪切攻击，而且可以实现盲检测。

A new watermarking scheme for still images

This paper presents a new scheme for watermarking of digital images. The scheme exploits the certain object region of the image in order to solve the problem that most existing watermarking techniques embed watermarks into the entire image without taking the object region into account. In the scheme, we firstly analyze the object features, then exploit discrete wavelet transform (DWT) to decompose the image and cluster the high-frequency wavelet coefficients to obtain the embedding domain. In the domain, we embed watermarks based on quantization modulation. Experiments show that this scheme is effective for the kind of images with salient object features, and it is robust to common image processing operations such as compression, cropping and so on.