Watermarking Algorithm for Vector Geo-spatial Data Based on DFT Phase

Based on the theory of discrete Fourier transform(DFT) and the characteristic of vector geo-spatial data for digital watermarking,a watermarking algorithm for vector geo-spatial data is studied by DFT phase.Because the little change of DFT phase can cause the big change of original data,the autocorrelation detection is used to assist for extracting digital watermarking.The experimental results show that the proposed algorithm is robust to the attack of vertex deletion,data format transformation,translation,rotation and so on.