New robust watermarking algorithm for vector data

Abstract

Because the existing vector data watermarking algorithm is insufficiently robust for compression and cropping, and has no sufficient control on map deformation, a new watermarking algorithm was proposed in this paper. Its main features are: ➀ it selected feature points and non-feature points from the sequence of Douglas, and then embedded watermarking points by wavelet transform, which is based on layer segmentation; ➁ it enhanced the map deformation control design. Furthermore, it increased the map graphic deformation control design. The algorithm was applied to experimental data, and the test results showed that the algorithm had good robustness on graphics geometric transformation, the addition, deletion and cropping of points in graph layers. Also, the graph distortion had been well controlled.