| Digital watermark for digital map is focused in this paper, according to the twodata format of vector and raster. First of all, in the analysis of vector map on the basis oftheir own characteristics, according to its characteristics and robustness requirements, awatermarking algorithm based on a kind of DCT transformation for vector map isproposed, the algorithm first read the vector map all vertices are plural serialization, andthe sequence is transformed to DCT, embedding watermarking information in higheramplitude component, enhancement the robustness of watermark; then, combiningArnold scrambling technology, a watermarking algorithm based on a kind of DWTtransformation for raster map is proposed, the algorithm will be a large amount of datain raster map was divided into blocks, each internal block of data repeats the digitalwatermarking embedding and extracting, which make the image is good in invisibility,and robust against cropping, JPEG compression and noise. Finally, the watermarkingsoftware for the raster map is developed to protect the copyright of geographicalinformation. |
