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Vector spatial data blind watermarking method based on feature point

A technology of spatial data and feature points, applied in the field of cartography and geographic information science, can solve the problems of data loss protection, deletion, watermark damage, etc., and achieve the effect of good robustness, guaranteed accuracy, and effective extraction

Inactive Publication Date: 2014-10-08
LANZHOU JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the watermark is not robust in some way, it will cause the watermark to be destroyed or deleted, and the data will lose protection

Method used

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  • Vector spatial data blind watermarking method based on feature point
  • Vector spatial data blind watermarking method based on feature point
  • Vector spatial data blind watermarking method based on feature point

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Embodiment Construction

[0025] In order to describe the technical content, structural features, objectives and effects of the present invention in detail, the following will be described in detail in combination with specific embodiments.

[0026] The implementation steps of the present invention can be summarized into two parts: watermark information embedding and watermark information extraction. Each implementation step is further described below.

[0027] Watermark information embedding refers to embedding watermark information into the original vector geospatial data to obtain vector geospatial data containing watermark information.

[0028] Step 1: Firstly, the watermark information needs to be scrambled. This algorithm uses Logistic chaotic transformation to scramble the watermark image. The initial value of chaotic transformation can be used as the password for watermark information extraction. Transform the scrambled watermark image into a one-dimensional sequence {w i =0,1|i=0,1,…,M-1},...

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Abstract

Digital watermarking is considered as an effective digital map copyright protection method. If a watermark is low in robustness in a certain respect, the watermark can be damaged or deleted, and data cannot be protected. The invention constructs a novel vector spatial data blind watermarking method based on a feature point, and a watermark is embedded into the feature point so as to enhance the robustness of the watermark. According to an algorithm, the advantage that geometric attacks are resisted by a DFT (Discrete Fourier Transformation) transform domain watermarking algorithm is utilized, the defect of locality of the DFT transform domain algorithm is avoided, high robustness is provided for attacks such as point addition, point deletion, compression and cutting, and blind detection is realized.

Description

technical field [0001] The invention belongs to the field of cartography and geographic information science and technology, and relates to a blind watermarking algorithm for transform domain vector geographic space data. Background technique [0002] Vector geospatial data is an important strategic information resource of the country, and it is the basic data of economy, military affairs, national defense construction and social development. The acquisition usually requires the help of expensive professional equipment and a lot of manpower and material resources. Therefore, its copyright protection important. Vector geospatial data is stored in digital form, which makes piracy extremely easy while facilitating data copying and dissemination. Currently, there is an urgent need for reliable technologies to secure geospatial data. [0003] Digital watermarking is considered to be an effective digital map copyright protection method. If the watermark is not robust in some way...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 张黎明闫浩文齐建勋张永忠禄小敏
Owner LANZHOU JIAOTONG UNIV