摘要
利用离散傅里叶变换对旋转、缩放和平移的不变性 ,通过对幅度谱进行矢量量化 ,在宿主图像DFT域中心化频谱的每个同心圆中嵌入一位水印信息 ,提取时采用“多数原则”来恢复水印的位信息 ,实现了盲检测 实验结果表明 :该水印不仅具有较好的不可感知性 ,而且对诸如旋转、缩放、剪切。
Taking advantage of the rotation, scale and translation invariant property of discrete Fourier transform, each watermark bit is embedded into each homocentric circles around the zero frequency term in DFT domain by quantizing the magnitude vectors of Fourier spectrum. The embedded sequence can be extracted by “majority principles” without resorting to the original unmarked image. Experimental results show that the watermark is invisible as well as robust to any combination of geometric transformations such as rotation, scaling, clipping or translation and other common image processing techniques.
出处
《计算机辅助设计与图形学学报》
EI
CSCD
北大核心
2004年第6期850-855,共6页
Journal of Computer-Aided Design & Computer Graphics
基金
国防科工委预研项目资助
关键词
数字水印
量化
几何变换
傅里叶变换
digital watermarking
quantization
geometrical transformation
Fourier transform
