Vector map lossless data hiding method based on vision perception characteristic

A vector map and visual perception technology, applied in the field of geographic information science and information hiding, it can solve the problems of poor robustness and insufficient data accuracy, and achieve the effect of high effective information load and data accuracy.

Inactive Publication Date: 2012-07-11
HARBIN ENG UNIV
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a vector map lossless data hiding method based on visual perception characteristics that can effectively solve the problems of insufficient data accuracy, poor robustness and lossless recovery of original data after vector map watermark embedding

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  • Vector map lossless data hiding method based on vision perception characteristic
  • Vector map lossless data hiding method based on vision perception characteristic
  • Vector map lossless data hiding method based on vision perception characteristic

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Embodiment Construction

[0045] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0046] combine figure 1 , the flow chart of the vector map lossless data hiding method based on visual perception characteristics of the present invention, the method is generally divided into two aspects: A, vector map watermark embedding algorithm; B, vector map watermark extraction algorithm and lossless restoration of original vector data.

[0047] A. Vector map watermark embedding algorithm, the steps are as follows:

[0048] (1) Extracting the polygonal curve from the vector map to be added with the watermark;

[0049] Such as figure 2 As shown, we use the polygonal curves extracted by Mapinfo. These curves belong to the superposition of two layer curves of "Harbin urban map water system line". Adding watermarks to these superimposed curves has high robustness.

[0050] (2) Carry out vertex coordinate extraction to each polygonal curve that extracts;

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Abstract

The invention provides a lossless data hiding method of a vector map based on visual perception characteristics. The method comprises the following steps: (1) extracting polygonal curves from the vector map to be added with a watermark; (2) extracting vertex coordinates of each extracted polygonal curve respectively; (3) searching a high-density vertex area of each polygonal curve; (4) selecting an area insensitive to noise of the polygonal curves as watermark carrier data by a threshold; (5) embedding the watermark in the selected area insensitive to the noise of the polygonal curves; and (6) extracting the watermark from the vector map containing the watermark information by the watermark extraction and recovering original vector map data without loss by a lossless recovery unit. The method can help effectively solve problems of insufficient data accuracy, poor robustness and lossless recovery of the original data of the vector map after being embedded with the watermark.

Description

(1) Technical field [0001] The invention relates to geographical information science and an information hiding method, in particular to a vector map lossless data hiding method based on visual perception characteristics. (2) Background technology [0002] Digital vector map is the core data of Geographic Information System (GIS), it has many excellent performances such as high precision, high-quality scaling and so on. The development of GIS technology makes vector maps have broad application prospects in many fields, and occupies a very important position in the national economy and national defense construction. Its security involves national security, scientific and technological cooperation and intellectual property rights. Therefore, vector maps, like other digital media, face a series of data security issues, including copyright protection, source tracking, and tampering identification. [0003] Digital watermark technology is a cutting-edge technology to protect data...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G06T1/00G06T5/00
Inventor门朝光曹刘娟
OwnerHARBIN ENG UNIV