Image Watermark Similarity Calculation of GIS Vector Data
Shasha Li, Wei Hua Zhou, Anbo Li · Procedia Engineering · 2012
In recent years, digital watermarking is playing an increasingly important role in the geographical information copyright protection. However, usually there is a high undetected rate in image watermarking authentication of GIS (Geographic Information System) vector data, because in watermark similarity calculation there are some problems, for example, the extracted watermark displacement and length changing, etc. This paper based on these focused research: the extracted watermark's position correction methods on the basis of the original watermark; the non-equal length strings similarity calculation methods, formed an image watermark similarity calculation of GIS vector data. This method effectively solved the problem of the high undetected rate in watermark certification, and to some extent improved the vector data's copyright authentication theoretical basis and technology.