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Vector geospatial data digital watermarking method based on angle difference

A vector geographic and spatial data technology, applied in image data processing, image data processing, instruments, etc., can solve problems affecting the invisibility of watermarks, reducing the practicability of watermarking algorithms, and limited data deformation

Active Publication Date: 2018-11-23
HUNAN UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

However, the existing research work mainly focuses on how to improve the robustness of the watermarking model, and the control of data deformation is very limited, which affects the invisibility of the watermark and reduces the practicability of the watermarking algorithm.

Method used

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  • Vector geospatial data digital watermarking method based on angle difference
  • Vector geospatial data digital watermarking method based on angle difference
  • Vector geospatial data digital watermarking method based on angle difference

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Embodiment Construction

[0065] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0066] Such as figure 1 As shown, a digital watermarking method for vector geospatial data based on angle difference includes the following steps:

[0067] 1) Taking the map as the object, the watermark carrier model is established based on the angle difference. The specific steps are:

[0068] 1-1) Extract feature point set: Select all the curves in the map object, and for each curve, extract the curve feature points in the curve, and use the angle formed by the curve feature points as the feature domain of the embedded watermark; the curve feature point extraction adopts Douglas -Pook's algorithm.

[0069] The extraction process of curve feature points is as follows:

[0070] (a) A curve Q in the selected map object 1 , the curve Q 1 The first and last nodes are used as the initial feature points, and are recorded as P 1 ,P n , at P 1 ,P n C...

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Abstract

The invention discloses a vector geospatial data digital watermarking method based on an angle difference, comprising the following steps: establishing watermark carrier models based on an angle difference by using maps as objects; selecting all curves in each map object by using the map objects as units, and defining identifications (IDs) of all the curves based on a curve feature length ratio; modulating watermark information into the watermark carrier model of each map object based on a quantization index watermark model and the IDs of all the curves; extracting the watermark information; and verifying the watermark information. The watermark information is modulated into the watermark carrier model of each map object based on the angle difference by using the quantization index modulation idea, and the intensity of the watermark information is embedded into a plurality of feature points constituting the angle, so that the invisibility of the watermark is effectively improved and the high fidelity of data is achieved without reducing the algorithm robustness.

Description

technical field [0001] The invention relates to a watermarking method, in particular to a digital watermarking method for vector geospatial data based on angle difference. Background technique [0002] Geographic Information System (GIS) applications have developed to the level of popular social applications, requiring spatial data carrying geographic information to have a correspondingly wide distribution range. In this context, it is imminent to solve the copyright protection problem of spatial data and ensure the safe distribution of geospatial data. As the preferred solution for copyright protection, digital watermarking of geospatial data has aroused the interest of many scholars at home and abroad. [0003] Since 2000, the research literature on digital watermarking of vector data has gradually increased in academic circles. Carlos was the first to discuss issues related to technology, law and copyright protection on the research of vector space data digital watermar...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/0021G06T2201/0065
Inventor 吴柏燕李朝奎王伟
Owner HUNAN UNIV OF SCI & TECH