一种基于特征的自适应水印算法

基于图像多尺度空间理论和扩频机制以及视觉感知模型的特性，给出一种基于特征的数字图像水印算法。算法采用尺度不变特征变换算子提取图像的局部不变特征区域，根据信噪比特点自适应选取水印嵌入强度因子，将一幅二值水印图像嵌入到原始图像中，实现了数字水印的不可感知性和鲁棒性。仿真结果表明，该算法对添加噪声、压缩、旋转等常见的图像处理攻击具有较强的鲁棒性。

Adaptive watermarking algorithm based on feature

A digital image watermarking algorithm based on feature is proposed according to the image multi-scale space theory,spread spectrum mechanism and the feature of visual perceptual model.The algorithm adopts the scale invariant feature transform operator to extract the local invariant feature region of original image,adaptively chooses the watermark embedding intensity factor according to the property of signal-to-noise ratio and embeds a binary watermark image into the otiginal image to implement the imperceptibility and the robustness of the digital watermarking.Experimental results show that the adaptive watermarking algorithm has good robustness against some common image processing attacks such as additive noise,compression and rotation,etc.