A Novel Watermark Algorithm Based on DFT and Curve Fitting
Jian Bang Cai · Computing Technology and Automation · 2009
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 location.The experimental results show that this method has the true sense of unity of robustness and visibility.