Watermarking geographical data on spatial topological relations

Authors:
Chuanjian Wang;Zhiyong Peng;Yuwei Peng;Liang Yu;Junzhou Wang;Qingzhan Zhao
Affiliations:
Computer School, Wuhan University, Wuhan, China 430072 and College of Information Science and Technology, Shihezi University, Shihezi, China 832003;Computer School, Wuhan University, Wuhan, China 430072;Computer School, Wuhan University, Wuhan, China 430072;Computer School, Wuhan University, Wuhan, China 430072;Computer School, Wuhan University, Wuhan, China 430072;College of Information Science and Technology, Shihezi University, Shihezi, China 832003
Venue:
Multimedia Tools and Applications
Year:
2012

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Abstract

Geographical data is of great value for data producers. How to protect copyright of geographical data effectively using digital watermarking is a hot research issue. In this paper, spatial topological relation existing between polygons is chosen as cover data, and watermark is embedded by slightly modifying the metric measure of spatial topological relation, and some geographical objects are scaled to derive the watermarked data. Global Main Scaling Distance is introduced to measure the distortions caused by watermark embedding. Experimental results show that the proposed algorithm has a good robustness against geometrical attacks, simplification, interpolation and noise addition attacks, and preserves shape of the watermarked geographical objects. Furthermore, a good tradeoff between robustness and fidelity is acquired in the proposed algorithm.