Robust geographic data watermarking method for public ownership verification
A geographical data watermarking and public verification technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of geographical data quality degradation, ineffective support, and low comprehensive robustness
Inactive Publication Date: 2014-07-02
SHIHEZI UNIVERSITY
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[0010] In order to overcome the shortcomings of the existing geographical data watermarking methods, such as low comprehensive robustness, inability to effectively support public verification of ownership, and the degradation of geographical data quality caused by watermark embedding, the present invention provides a robust geographical data watermarking method that can publicly verify ownership
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[0048] During specific implementation, the process provided by the technical solution of the present invention can be automatically run by those skilled in the art using computer software technology. In order to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0049] A geographic database instance can be defined as D={R,P}, where R represents a reference coordinate system (such as WGS84), and P={P 1 ,P 2 ,...,P n}, which represents a set of n line or surface objects. Set any surface feature P i P is composed of a series of vertices i ={p i1 ,p i2 ,...,p il}, including l vertices, which can be regarded as the coincidence of the l+1th vertex and the first vertex, that is, p il+1 =p i1 ; Let any line feature P i P is composed of a series of vertices i ={p i1 ,p i2 ,...,p il}, including l vertices. The value range of i is...
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The invention provides a robust geographic data watermarking method for public ownership verification. The robust geographic data watermarking method comprises a watermark embedding process and a watermark detecting process. The watermark embedding process comprises the steps that a corresponding ground feature is calculated for each ground feature in an original geographic data set, the ground features are divided into groups, copyright information blocks are hidden in the groups respectively, a corresponding verification vector set is generated for each group, and the verification vector sets are used as a public key and released along with a product of the geographic data set. The watermark detecting process comprises the steps that a temporary public key is generated, user copyright information is calculated according to the temporary public key and the public key, the extracted user copyright information is contrasted with publicly-released copyright information, the data copyright can be declared if the user copyright information is the same as the copyright information, and otherwise the data copyright cannot be declared. The robust geographic data watermarking method for public ownership verification can effectively resist common geographic data watermark attack modes; no key is needed in the watermark detecting process, and therefore the data copyright can be verified publicly and repeatedly. According to the robust geographic data watermarking method, original data are not modified, and the quality of the original data is not lowered.
Description
technical field [0001] The invention belongs to the field of data security, in particular to a robust geographic data watermark method that can publicly verify ownership. Background technique [0002] Geographical data is the basis of geographic information systems, and most GIS applications are inseparable from geographical data (the present invention focuses on vector geographic data types, including three elements of point, line and plane). Constructing and maintaining geographic data is a complex project, which includes processes such as data collection, digitization, vectorization, standardization, structuring, and data management and maintenance. These processes are inseparable from professional technical personnel and equipment, and require a lot of time. material and financial resources. Therefore, geographic data is a valuable asset for data producers. However, due to its electronic data characteristics, it is very easy to be copied. Once geographic data is sold, ...
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Inventor 汪传建隋莉莉程莉赵庆展尹小君李伟
Owner SHIHEZI UNIVERSITY