A Construction of Digital Watermarking Model for the Vector Geospatial Data Based on Magnitude and Phase of DFT
Qisheng Wang · Beijing Youdian Xueyuan xuebao · 2011
For the characteristics of the vector geospatial data,the construction of the digital watermarking model for the vector geospatial data is proposed based on the magnitude and phase of discrete Fourier transform(DFT).The vector geospatial data is transformed into the DFT domain.The watermark is embedded in the magnitude and phase of the DFT coefficient range,then the watermarked coefficients is performed an inverse DFT(IDFT) and get the embedded vector geospatial data.Experiment shows that the model can assure the data accuracy.It will be robust for the translation,deleting a certain ration vertices at random,rotation,format transformation and scale etc.