摘要
基于尺度不变特征变换（SIFT）实现一种抗几何攻击数字水印。对SIFT进行图像特征点的检测，选择合适的特征点生成载体图像中的圆形区域，将圆形区域划分为扇形区域，然后采用空域奇偶量化方法进行水印信息的嵌入。为抵抗几何攻击，检测前基于SIFT稳定特征点实现图像缩放和旋转角度的估计，并就估计结果进行图像缩放和旋转恢复，对恢复后的图像进行数字水印的检测。实验证明，该方法对几何攻击具有较强的鲁棒性。
A novel digital watermark algorism based on Scale Invariant Feature Transform（SIFT） is proposed. Feature points are detected using SIFT, and some suitable feature points are selected to form circular patches of the carrier image. The circular patches are divided into sectors, and watermark is embedded into the sectors using spatial odds and even quantification. The watermark is detected using correlation method. To implement the geometric robustness, SIFT is used to detect the rotated angle and the scale that the image has undergone. And then the parameters obtained above are used to restore the image. The experiment results show that the algorism is robust to geometrical attack.
出处
《计算机工程》
CAS
CSCD
北大核心
2008年第19期154-156,共3页
Computer Engineering
基金
江苏省自然科学基金资助项目（BK2006569）
长三角重大科技联合攻关基金资助项目（BE2004400）
关键词
几何攻击
数字水印
尺度不变特征变换
geometrical attack
digital watermark
Scale Invariant Feature Transform（SIFT）
