The Digital Watermarking Algorithm for Vector Geographic Data Based on Point Positioning
FU Hao-jun · Acta Geodaetica et Cartographica Sinica · 2013
Because of too many non-watermark data points,current robust watermarking algorithms can hardly detect the watermark in vector geographic data when attacked by joining and updating.Aimed at this issue,a digital watermarking algorithm based on point positioning by using fragile watermarking technology is presented.Along with the robust watermark embedding,the fragile watermark which formed by features of vector geographic data coordinates is embedded in the data using the idea of quantization according to accuracy requirements.And the tamper can be enclosed with coordinate for each data point through the fragile watermarking detecting.So the interference of non-watermark data points can be excluded,and the robust watermarking algorithm detecting copyright information reliably for vector geographic data are made.The experiments show that the proposed algorithm can improve the validity of the watermark detection results,for it can resist the attacks of data joining and updating effectively,and exclude the interference of non-watermark data points.