一种基于DFT和曲线拟合的水印算法

提出一种新的基于双线性插值和DFT的鲁棒水印算法.该算法利用傅立叶变换较好的频域分布特性和双线性插值的拟合特性,将置乱后的水印信息利用分别嵌入到载体图像DFT频域的实数部分和虚数部分,然后作离散傅立叶逆变换,并取其实数部分重构公开图像.算法的优点在于大大增加水印的嵌入量,而且利用线性插值的拟合性使得水印找到最佳的嵌入位置.实验结果表明,本算法具有较好的鲁棒性和不可见性,达到真正意义上的统一.

A Novel Watermark Algorithm Based on DFT and Curve Fitting

In this paper,a new robust watermark algorithm is proposed based on bilinear interpolation and DFT.Here,The better frequency distribution and linear interpolation are used to embed the watermark into the real and imaginary parts,then,the inverse Discrete Fourier Transform is employed and the watermarked image is reconstructed by the real part.The advantages of this method lies in greatly increasing the amount of embedded watermark and the use of linear interpolation of finding the best embedded watermark lo...