A double zero-watermarking algorithm for 2D vector maps
Jianguo Sun · Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University · 2011
To address the contradiction between robustness and imperceptibility in a traditional watermarking algorithm,a double zero-watermarking algorithm for 2D vector maps was proposed.Based on feature point extraction,for the feature point reflecting the outline of the polyline,the algorithm utilized the feature point relation model established by a BP artificial neural network to construct a zero-watermarking parameter that was robust against simplification and compression attacks.For the non-feature point reflecting the detail of the polyline,the algorithm utilized the matrix singular value decomposition(SVD) to construct a parameter of zero-watermarking that was robust against geometry attacks.This algorithm perfectly depicts the whole character of each polyline,and the construction of double zero-watermarking parameters can improve robustness and achieve a comprehensive protection target for vector maps.Experimental results show that the proposed zero-watermarking has preferable robustness and invisibility,which is suitable for copyright protection of 2D vector maps.