Multiple digital watermarking method for geographic information system (GIS) vector data

Abstract

The invention discloses a multiple digital watermarking method for geographic information system (GIS) vector data, and belongs to the field of geographic information copyright protection. The watermark embedding process of the method comprises the following steps of: reading and processing the data; embedding algorithms by an odd-even method; respectively embedding watermarks into a spatial domain, a discrete wavelet transform domain, a discrete cosine transform domain of horizontal coordinates and vertical coordinates by a low-order additive method and a least significant bit substitution method; adopting a zero-watermark algorithm; and storing watermark-containing data. The watermark extraction process of the method is the inverse process of the embedding process. A practical multiple digital watermark protection method is comprehensively integrated aiming at the common attack modes of the GIS vector data and according to the principle and anti-attack performance of each single algorithm. Various embedding modes are adopted and the specific embedding position of each watermark is controlled, so that embedding and extraction are non-interfering, conflicts are avoided, the advantages of each algorithm are exerted and complemented and the anti-attack capability of digital watermarks is greatly improved.

Description

technical field [0001] The invention belongs to the field of geographic information copyright protection, and in particular relates to a multiple digital watermarking method for GIS vector data by embedding and extracting watermarks in a comprehensive manner to improve algorithm robustness. Background technique [0002] In recent years, scholars at home and abroad have focused on the design of digital watermarking algorithms for geographic information system (GIS) vector data, and proposed a variety of digital watermarking algorithms for GIS vector data. With the deepening of digital watermarking technology in the application of GIS vector data products, a single watermark has obvious targeting in terms of robustness, limited anti-attack ability, and is easy to be mastered or destroyed by attackers, so it cannot meet people's needs. Therefore, multiple digital watermarking techniques are produced. Multiple watermarking refers to the technology of embedding multiple watermar...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a method for embedding and extracting multiple digital watermarks aimed at the characteristics of GIS vector data in view of the problem that the current single watermark algorithm is not robust enough to effectively protect GIS vector data, so that it can be used in the resistance coordinate system It has good robustness in transformation attack, cropping attack, compression attack, noise addition attack, editing attack, adding data attack, etc.

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