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Vector map lossless data hiding method based on recursive embedding

A technology of vector map and data hiding, which is applied in the field of information hiding and geographic information science, and can solve the problems of small vector map watermark embedding capacity, insufficient data accuracy and lossless recovery of original data, etc.

Inactive Publication Date: 2010-02-24
HARBIN ENG UNIV
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Problems solved by technology

[0018] The purpose of the present invention is to provide a vector map lossless data hiding method based on recursive embedding that can effectively solve the problems of small vector map watermark embedding capacity, insufficient data accuracy and lossless recovery of original data

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  • Vector map lossless data hiding method based on recursive embedding
  • Vector map lossless data hiding method based on recursive embedding
  • Vector map lossless data hiding method based on recursive embedding

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Embodiment Construction

[0059] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0060] The present invention is based on the vector map lossless data hiding method of N-point mean reversible technology, and this method is generally divided into two aspects: A, vector map watermark embedding algorithm (such as figure 1 shown); B, vector map watermark extraction algorithm and lossless recovery of the original vector data (such as figure 2 shown).

[0061] A. Vector map watermark embedding algorithm, the steps are as follows:

[0062] (1) Extracting the polygonal curve from the vector map to be added with the watermark;

[0063] Such as image 3 As shown, we use the polygonal curves extracted by Mapinfo. These curves belong to the superposition of the "UK Highway" layer curves. Adding watermarks to these superimposed curves has high robustness.

[0064] (2) Carry out vertex coordinate extraction to each polygonal curve that extracts;

[00...

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Abstract

The invention provides a vector map lossless data hiding method based on recursive embedding, which comprises the following steps: (1) extracting polygonal curves for the vector map to be added with watermarks; (2) respectively carrying out vertex coordinates extraction on each of the extracted polygonal curves; (3) carrying out grouping on the sequences of the vertex coordinates of each of the polygonal curves; (4) classifying the grouped uj in each polygonal curve in step (3); (5) carrying out recursive watermark embedding on each embeddable watermark grouping of each polygonal curve; (6) repeating step (5) for each grouping of each polygonal curve to completely embed the watermark information into each polygonal curve; (7) using watermark extracting and lossless recovering units to carry out recursive watermark extraction on the vector map containing the watermark information; and (8) recovering original data of the information embeddable grouping on the basis of extracting the watermarks. The invention can achieve the lossless recovery of the original vector map data after the watermarks are extracted, and is especially suitable for the situations where confidential vector mapsare not allowed to be falsified.

Description

(1) Technical field [0001] The invention relates to the field of geographic information science and information hiding, and specifically to a vector map lossless data hiding method based on recursive embedding. (2) Background technology [0002] Vector map is the core data constituting Geographic Information System (GIS), it has many excellent performances such as high precision, high-quality scaling and so on. Like other digital media, vector maps also face a series of data security issues, including copyright protection, source tracking, and tampering identification. Therefore, reliable technologies are urgently needed to ensure the security of geospatial data. Digital watermark technology is a cutting-edge technology to protect data security developed with the process of digitalization. It combines secret information-watermark with original data and hides them without affecting the availability of original data, and becomes an inseparable part. , thereby proving data own...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 门朝光李存伟曹刘娟
Owner HARBIN ENG UNIV
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