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Watermark embedding method and detection method of vector map based on virtual grid

A vector map and virtual grid technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of reverse cracked original data, illegal copy of vector map data, lossless recovery, etc.

Active Publication Date: 2015-08-05
菏泽建数智能科技有限公司
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Problems solved by technology

[0004] In order to overcome the shortcomings of existing vector map data that are easy to be illegally copied, reversely cracked, and original data are restored without loss, the present invention provides a method that can effectively solve the problems of vector map data being illegally copied, reversely cracked, and original data without loss. Watermark embedding method and detection method of vector map based on virtual grid

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  • Watermark embedding method and detection method of vector map based on virtual grid
  • Watermark embedding method and detection method of vector map based on virtual grid
  • Watermark embedding method and detection method of vector map based on virtual grid

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings.

[0043] refer to Figure 1~Figure 8 , a virtual grid-based vector map watermark embedding method, comprising the following steps:

[0044] (1) figure 1 It is the specific steps to design a virtual grid with identification significance:

[0045] (1.1), determine a grid reference direction based on the north direction of the map, and its main identification feature is the grid direction α (0≤α≤360°);

[0046] (1.2), define a set of watermark information embedding grid line angle β (0≤β≤360°);

[0047] (1.3), define the spacing of the virtual grid Iλ (0≤λ), and the spacing of the grid IIμ (0≤μ);

[0048] (1.4), for the four variables of directions α, β, λ, and μ, a specific grid with marking significance can be designed, and this virtual grid contains relevant watermark information;

[0049](1.5), this virtual grid can cover the entire vector digital map, the larger ...

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Abstract

A watermark embedding method of a vector map based on virtual grids comprises the following steps: (1). the process of deciding a virtual grid which has identifying significance, (2). the embedding process of a feature point, (3). the watermark embedding process of the vector map based on the virtual grids: detecting whether crossing points exist between coordinate series with more than two top points in vector map data and each virtual grid line in one set of virtual lines, and if the crossing points exist, the relevant crossing points are embedded into the coordinate series according to feature point embedding strategies. Moreover, provided is a watermark detection method of the vector map based on the virtual grids. The watermark embedding method and the watermark detection method of the vector map based on the virtual grids is capable of effectively solving the problems that the vector map data are illegally copied and reversely cracked, and original data are recovered non-destructively.

Description

technical field [0001] The invention belongs to the field of copyright protection of vector map data in geographic information systems, and in particular relates to a robust watermark embedding method and extraction method based on overall vector map data. Background technique [0002] With the development and popularization of computer technology and the Internet, as well as the advancement of multimedia data storage and transmission technology, the transmission and sharing of digital products has become very easy, and the illegal copying of digital products has also become very easy, which brings a A series of questions about copyright. In order to protect the interests of copyright owners, it is urgent to find an effective method to protect the intellectual property rights of digital products. [0003] The vector map data watermarking algorithm is different from the traditional image-based watermarking algorithm. This is mainly because the map data does not have the univ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 朱文忠李岩叶露涵朱龙泽
Owner 菏泽建数智能科技有限公司
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