Dual zero watermark method and system of vector map, storage medium and server

A vector map and zero-watermark technology, applied in the field of image processing, to improve the ability to resist cropping attacks and achieve uniform watermarks

Active Publication Date: 2018-12-07
张新长 +3
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Problems solved by technology

[0005] The object of the present invention is to overcome the deficiencies of the prior art. The present invention provides a double zero watermark method, system, storage medium and server of a vector map, by extracting the sequence information of t

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  • Dual zero watermark method and system of vector map, storage medium and server
  • Dual zero watermark method and system of vector map, storage medium and server
  • Dual zero watermark method and system of vector map, storage medium and server

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Embodiment

[0073] see figure 1 , figure 1 It is a schematic flow chart of the double zero-watermarking method for the vector map in the embodiment of the present invention.

[0074] Such as figure 1 Shown, a kind of double zero watermark method of vector map, described double zero watermark method comprises:

[0075] S11: Extracting feature points and non-feature points from the vector map to obtain feature points and non-feature points of the vector map;

[0076] Specifically, the feature points of the vector map are obtained by using the Douglas-Pucker compression method to extract the feature points; the feature points of the vector map are erased to obtain the non-feature points of the vector map.

[0077] In the specific implementation process, feature point extraction refers to extracting some of the most stable vertices in the vector map through a certain algorithm, and constructing watermarks based on these points; feature points are the key primitives of the vector map, inclu...

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Abstract

The invention discloses a dual zero watermark method of a vector map, wherein the dual zero watermark method comprises: extracting feature points and non-feature points from the vector map to obtain the feature points and the non-feature points of the vector map; after a series of data mining processes is performed on the feature points, obtaining an angle value sequence of a triangle composed ofthe feature points; after a series of data mining processes is performed on the non-feature points, obtaining a binary table of the non-feature points; obtaining a watermark sequence after a series ofprocesses is performed on an initial watermark; performing XOR operations on the watermark sequence and the angle value sequence and on the watermark sequence and the binary table separately, and then performing graphical and merging process to obtain the dual-watermark vector map. In the embodiment of the present invention, the vector map uses dual watermarks so as to solve the poor watermark robustness in case of feature point attack. The present invention also provides a dual zero watermark system of the vector map, a storage medium and a server.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a double zero watermark method, system, storage medium and server for vector maps. Background technique [0002] Two-dimensional vector maps have extremely high application value in many fields such as engineering construction, urban planning, military affairs, and navigation, but they are expensive to manufacture, and are easily copied, tampered, and embezzled in the process of network dissemination, thereby causing serious damage to the holders. The immeasurable loss; with the increasing demand for copyright protection, digital watermarking, as an important method of copyright protection, has developed rapidly in recent years; the research on digital watermarking of images was the first to be carried out, mainly focusing on the design of watermark embedding algorithms in a targeted manner. To improve the invisibility or robustness of watermarking, the rich research res...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/0071G06T2201/0063
Inventor 张新长辛秦川奚旭梁伟东
Owner 张新长
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