High-robustness geographical database watermark method suitable for polygon type

A highly robust, database technology, applied in digital data protection, electrical digital data processing, special data processing applications, etc., can solve the problem of not considering maintaining the shape of watermarked geographic objects, changing the shape of geographic objects, etc.

Inactive Publication Date: 2011-09-14
WUHAN UNIV
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  • Application Information

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Problems solved by technology

In fact, watermark embedding can also lead to changes in the shape of geographic objects, ...

Method used

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  • High-robustness geographical database watermark method suitable for polygon type
  • High-robustness geographical database watermark method suitable for polygon type
  • High-robustness geographical database watermark method suitable for polygon type

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Embodiment

[0056] A highly robust geodatabase watermarking method suitable for polygon types, including a watermark embedding step performed by a watermark embedding execution module and a watermark detection step performed by a watermark detection execution module, based on the definition: geographic dataset D ={ R , P},in R Indicates the reference coordinate system, P ={ P 1 , P 2 ,…, P n},express nA collection of Polygon type features. feature P i Consists of a series of vertices, P i = { p i1 , p i2 ,…, p m , p m+1 = p i1}, i ?{1,2,..., n}, each feature corresponds to a tuple in the relationship model; the specific operation is as follows:

[0057] Watermark embedding steps performed by the watermark embedding execution module:

[0058] Step 1.1, obtain robust feature identification data:

[0059] In order to ensure watermark synchronization, database watermarking and geographic data watermarking methods usually determine robust identifiers for tuples ...

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Abstract

The invention discloses a high-robustness geographical database watermark method suitable for a polygon type, which comprises a watermark embedding process and watermark detecting process. The watermark embedding process specifically comprises the steps of generating a robust ground feature identification for each ground feature, dividing all the ground features into a plurality of groups according to the robust ground feature identifications and repeatedly embedding one watermark position in each group; and similar to the watermark embedding process, the watermark detecting process specifically comprises the steps of generating robust ground feature identifications, grouping the ground features, carrying out variable-step-size quantitative demodulation and watermark vote, and finally judging ownership. The high-robustness geographical database watermark method utilizes the highest h effective position of average feature distance of the ground features as a robust ground feature mark which does not change with the translation, rotation, simplification, peak interpolation, noise addition, tuple deletion, tuple addition and tuple modification of the geographical data, therefore, thehigh-robustness geographical database watermark method has good capabilities of resisting against geometrical attack (except for zooming), peak attach and tuple attack.

Description

technical field [0001] The invention relates to a watermarking method, in particular to a polygon type and highly robust geographical database watermarking method. Background technique [0002] Since the world's first GIS (Geographical Information System) system was proposed and established by Canadian surveyor R.F.Tommlison in the 1960s, GIS technology and applications have made great progress. At present, with the emergence of emerging mass consumer applications such as car navigation and location services, GIS applications are showing a trend of accelerated development. [0003] Geographical data is the foundation of GIS applications, and most GIS applications cannot do without vector geographic databases (point, line, surface three types of data). Obtaining, constructing and maintaining spatial database is a complex project with huge workload. For example, the collection and production of high-quality geographic data is inseparable from professional technical personn...

Claims

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Application Information

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IPC IPC(8): G06F17/30G06F21/24G06F21/16G06F21/60
Inventor 彭智勇彭煜玮汪传建葛贺飞
Owner WUHAN UNIV
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