Method for calculating similarity of Geographic Information System (GIS) vector data image watermarks

A similarity calculation, image watermarking technology, applied in the direction of calculation, image data processing, image data processing, etc., can solve the problems of watermark information prone to shift and confusion, high missed detection rate, etc., to improve the theory and method system, The effect of improving quality and reducing missed detection rate

Inactive Publication Date: 2011-11-23
NANJING NORMAL UNIVERSITY
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Problems solved by technology

It is precisely because of the many characteristics of vector data that the watermark information extracted from it is prone to displacement and confusion. In the process of watermark authentication, if the traditional watermark similarity calculation method is used, it will cause a high detection rate. It is necessary to propose a more reasonable watermark similarity calculation method

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  • Method for calculating similarity of Geographic Information System (GIS) vector data image watermarks
  • Method for calculating similarity of Geographic Information System (GIS) vector data image watermarks
  • Method for calculating similarity of Geographic Information System (GIS) vector data image watermarks

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Embodiment Construction

[0035] The present invention adopts the following technical idea: firstly use the original watermark W to correct the position of the extracted watermark W′, so that the pixels of the copyright image that have been confused return to the correct position; the corrected watermark W″ and the original watermark W are approximated by character strings The matching dynamic programming algorithm performs similarity calculation.

[0036] In this example, a certain image watermark is selected, and the whole process of image watermark generation, watermark position correction, and watermark similarity calculation is further described in detail. This example selects the shp layer data of 1:25 in Jiangsu Province (such as figure 1 ) as the carrier data, select the binary image symbol m (such as figure 2 ) as copyright information.

[0037] (1) The process of watermark position correction:

[0038] Step 1: The original watermark W = "10001110000011100101...", the length is L W =6400,...

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Abstract

The invention discloses a method for calculating the similarity of Geographic Information System (GIS) vector data image watermarks belonging to the geographic information version protection field. The method comprises the following steps of: correcting the position of an extracted watermark W' by means of an original watermark W such that the disordered pixels of a version image return to the right positions thereof; and then performing similarity calculation on the corrected watermark W' and the original watermark W by employing a dynamic programming algorithm of approximate character-string matching. The method disclosed by the invention is capable of accurately correcting the pixels of the extracted image watermark to the right positions, visually reflecting the tampered positions of data and objectively measuring the similarity of the original watermark and the extracted watermark; therefore, the quality of watermark authentication is improved to a certain extent, the omission factor of the watermark authentication is reduced, and the theory and method system of the geographic information version protection is completed; and the method can be applied to the aspects of the version protection technology and secure transmission of the GIS vector data.

Description

technical field [0001] The invention belongs to the field of geographic information copyright protection, and in particular relates to a position correction and similarity calculation method for GIS vector data image watermarks. Background technique [0002] Copyright protection is copyright authentication, content confidentiality and access control based on copyright marks. In recent years, the copyright marking technology represented by digital watermarking has increasingly become the focus of the research and application of geographic information copyright protection. At home and abroad, there have been relatively mature studies on how to embed watermarks in vector data, and there are already a considerable number of literatures available for reference in terms of basic algorithm theory. Compared with raster data with "obvious attributes, implicit location", vector data has its own individual characteristics: "obvious location, implicit attributes", data organization wit...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 李莎莎李安波周卫闾国年
Owner NANJING NORMAL UNIVERSITY
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