Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Digital watermarking method for vector geospatial data based on combination of dft coefficients

A technology of spatial data and digital watermarking, applied in image data processing, image data processing, instruments, etc., can solve problems such as error and original data influence, achieve high fidelity and improve invisibility

Active Publication Date: 2022-05-31
HUNAN UNIV OF SCI & TECH
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Digital watermarking method for vector geospatial data based on combination of dft coefficients
  • Digital watermarking method for vector geospatial data based on combination of dft coefficients
  • Digital watermarking method for vector geospatial data based on combination of dft coefficients

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a digital watermarking method for vector geospatial data based on DFT coefficient combination, comprising the following steps: generating watermark information; taking a map as an object, establishing a watermark carrier model based on DFT coefficient combination polynomials; The established watermark carrier model modulates the watermark information in each map object; extracts the watermark information for verification. The present invention is based on the DFT coefficient combination polynomial of the feature point set of the geometric object, and uses the classic quantization index modulation method to modulate the watermark information in each DFT coefficient of the polynomial, thereby apportioning the watermark intensity to multiple coefficients without reducing the robustness of the algorithm In the case of stability, the invisibility of the watermark is effectively improved, and the high fidelity of the data is realized.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com