Vector space data blind watermark method resistant to projection attack

Abstract

The invention, specific to the defects of an existing vector geographic space data digital watermarking method, provides vector space data watermark algorithm resistant to projection transformation and a coordinate transformation attack effectively. The method fully takes account of the features of the projection transformation and coordinate transformation of a vector space data, in the watermark embedding scheme, an original vector space data is converted below a WGS84 geographic coordinate system firstly, then a DFT domain watermark algorithm is applied, the watermark is embedded into a WGS84 coordinate system space data, finally, the WGS84 coordinate system space data containing the watermark is converted into the original data coordinate system. When the watermark is extracted, after the vector space data is converted to the WGS84 coordinate system, then the watermark information is extracted. The experimental results indicate that the watermark scheme has good robustness for the projection transformation and the coordinate system transformation attack, and has relatively strong robustness for the attacks of data such as clipping, rotation, translation and the like.

Description

technical field [0001] The invention belongs to the field of cartography and geographic information science and technology, and relates to a vector space data blind watermarking method against projection attack. Background technique [0002] Vector spatial data plays a very important role in navigation, electronic map, urban management, environmental protection and so on. Spatial data is stored in digital form, which not only facilitates data copying and dissemination, but also makes piracy extremely easy. Digital watermark technology is a technology that embeds secret watermark information (copyright information, user information, etc.) The most promising technology at present. Digital watermarking has received extensive attention and research in the protection of digital map copyright. [0003] According to the embedding space of watermark, digital watermarking algorithm can be divided into spatial domain algorithm and transform domain algorithm. The spatial domain alg...

AI Technical Summary

Problems solved by technology

If the algorithm does not consider these types of attacks enough, it will affect the robustness of the watermark. Using this loophole, it is easy to destroy the watermark, it is difficult to extract the watermark information, the copyright protection function is lost, and the practicability of the algorithm is not strong.

Although scholars have realized the importance of anti-projection transformation and coordinate system transformation to the robustness of watermarking, there is little research on watermarking algorithms that can resist projection transformation and coordinate system transformation attacks.

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