Vector map reversible information hiding method

Abstract

The invention provides a vector map reversible information hiding method. The method comprises steps that a vertex coordinate is acquired, a reference vertex is selected; quantification step is calculated; watermarking embedding is carried out; watermarking extraction and lossless recovery are carried out. Through the method, according to the reference vertex and precision error tolerance of a vector map, embedding parameters are set, the normalization quantification step is calculated, the reference vertex and a line of each vertex are quantified, the position of each vertex in a quantification section is changed to realize watermarking embedding, disturbance of watermarking embedding on the vector map can be effectively controlled, robustness on rotation, uniform zoom and translation operation is realized, on the other hand, the method can realize lossless recovery of the original data of the vector map after watermarking extraction, and the vector map can be guaranteed to be precisely used.

Description

technical field [0001] The invention relates to the fields of geographic information science and information hiding, and specifically relates to a vector map reversible information hiding method with rotation, uniform scaling and translation invariance. Background technique [0002] Nowadays, as the basic data of Geographical Information System (GIS), vector maps are widely used in military, civilian cartography, urban planning, navigation and other fields. Obtaining vector map data consumes a lot of manpower and material resources, and with the help of network and geographic information processing tools, these data with great economic value are easily copied, tampered and disseminated illegally, causing geographic information producers and publishers to suffer heavy losses. Therefore, how to effectively protect the copyright and integrity of vector map data has become an urgent problem for the geographic information industry. [0003] Vector map information hiding technolo...

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Problems solved by technology

[0005] In summary, although people have proposed some reversible information hiding methods for vector maps, trying to solve the problem of restoring the original data while transferring secret information, these methods are still insufficient in resisting rotation, scaling and translation attacks

[0006] In addition, patent application No. 2013102366569, titled "A method for reversible information hiding of vector maps based on LSD plane"; patent authorization announcement No. CN102110281B, titled "A method for embedding and extracting difference-extended watermarks for shape point layer data "; patent authorization announcement number CN101604440B, the Chinese patent document titled "Vector Map Reversible Watermark Processing Method Based on Spatial Features" also involves the problem of reversible information hiding of vector maps, but this patent application adopts different methods, and cannot simultaneously rotate , uniform scaling and translation robustness

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