Vector geospatial data digital watermark method based on DFT coefficient combination

A spatial data and digital watermarking technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as error and original data influence

Active Publication Date: 2018-11-06
HUNAN UNIV OF SCI & TECH
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Problems solved by technology

[0005] However, the existing DFT transform domain algorithm directly embeds the watermark into the amplitude coefficient after DFT transform, which has a great impact on the original data and causes a large error

Method used

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  • Vector geospatial data digital watermark method based on DFT coefficient combination
  • Vector geospatial data digital watermark method based on DFT coefficient combination
  • Vector geospatial data digital watermark method based on DFT coefficient combination

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Embodiment Construction

[0052] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0053] Such as figure 1 As shown, a digital watermarking method for vector geospatial data based on DFT coefficient combination, including:

[0054] 1) Generate watermark information. The specific steps are: read the original binary watermark image, apply the Logistic chaotic transformation to scramble the watermark image; then transform the scrambled watermark image into a one-dimensional sequence {w j =0,1|j=1,2,...,M}, M is the watermark length.

[0055] 2) With the map as the unit, the watermark carrier model is established based on the DFT coefficient combination polynomial. The specific steps are:

[0056] 2-1) Extract feature point set: Select all the curves in the map object, and for each curve, use the Douglas-Puke algorithm to extract the feature point set, the extracted feature point set is v, the feature point v in v k =(x k ,y k ), k...

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Abstract

The invention discloses a vector geospatial data digital watermark method based on DFT coefficient combination. The method comprises steps that the watermark information is generated; a map is taken as an object, and a watermark carrier model is established based on the DFT coefficient combination polynomial; the map object is taken as a unit, the watermark information is modulated into each map object based on the established watermark carrier model; the watermark information is extracted for verification. The method is advantaged in that based on the DFT coefficient combination polynomial ofa geometric object feature point set, the classical quantization index modulation method is utilized to modulate the watermark information into each DFT coefficient of the polynomial, so watermark intensity is distributed to multiple coefficients, without reducing robustness of the algorithm, watermark invisibility is effectively improved, and the high fidelity of the data is achieved.

Description

technical field [0001] The invention relates to a watermarking method, in particular to a digital watermarking method for vector geospatial data based on DFT coefficient combination. Background technique [0002] Vector geospatial data digital watermarking technology, as the preferred solution to the problem of spatial data copyright protection, has aroused the interest of many scholars at home and abroad. [0003] From the analysis of the embedding position of the watermark, the robust watermarking algorithms for vector geospatial data are mainly divided into the following categories: (1) The watermark information is hidden in the vertex coordinates. Modify the least significant bit of the vertex coordinates to embed the watermark or combine the watermark bits behind the vertex coordinate bits; in order to resist compression or simplification attacks, the watermark information is embedded in the feature points of the geometric figure. (2) The watermark information is hidde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/0021G06T2201/0065G06T2201/0052
Inventor 吴柏燕李朝奎王伟
Owner HUNAN UNIV OF SCI & TECH
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