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Compressed-sensing-based vector geographic data watermark information generation method

A technology of vector geographic data and watermark information, applied in the field of geographic information copyright protection, can solve the problems such as the inability to embed watermark information in vector geographic data with a small amount of data, the limited capacity of watermark information, and the difficulty of embedding watermark in data with small amount of data, etc. It is difficult to embed watermark information, and the effect of improving adaptability and security

Inactive Publication Date: 2012-09-19
CHANGSHU NANJING NORMAL UNIV DEV RES INST
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Problems solved by technology

[0009] The purpose of the present invention is to propose a method for generating watermark information of vector geographic data based on compressive sensing to solve the problem of watermark information capacity limitation and small data volume. It is difficult to embed watermarks in large volume data, and improve the security and adaptability of watermarking algorithms for vector geographic data

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Embodiment Construction

[0033] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0034] (1) Sparse expression of vector geographic data watermark information

[0035] Step 1: Read the original watermark information {w ij ,i=1,2,...,M,j=1,2,...,N} is a binary image of size M×N. Before perceptual processing of the original watermark information, it needs to be sparsely expressed.

[0036] Step 2: Calculate the Gaussian white noise statistical properties of the original watermark information.

[0037] Step 3: For the original watermark information, the sparse basis proposed in this embodiment is a fast curvelet transform (curvelet), and the low-frequency information after the curvelet transform is used to replace the original watermark information. The watermark information after the curvelet transformation can remove a lot of redundant information, and obtain a sparse binary watermark image based on the curvelet transform...

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Abstract

The invention discloses a compressed-sensing-based vector geographic data watermark information generation method. The method comprises the following steps of: establishing a sparse representation method of vector geographic data watermark information on the basis of a compressed sensing theory, designing a measurement matrix and a constraint condition thereof for the sparse representation of the watermark information, constructing a spare representation model of the watermark information, and reconstructing extracted watermark information. By the method, the sparsity of the vector geographic data watermark information is fully utilized, and the problems of limitation to watermark information capacity and incapability of embedding watermark information in a small data volume are solved, so that the security and adaptability of a vector geographic data digital watermark algorithm are improved.

Description

technical field [0001] The invention belongs to the field of geographic information copyright protection, and in particular relates to a method for generating watermark information based on compressed sensing vector geographic data, so as to improve the security and adaptability of the vector geographic data watermark algorithm. Background technique [0002] Vector geographic data is an important part of national basic geographic data and a supporting achievement of national infrastructure construction and earth science research. It has been widely used in all aspects of government, military, and society. However, security issues such as piracy, copyright infringement, and leaks that follow have caused great harm to the security of vector geographic data, and reliable technical means are urgently needed to protect the security of vector geographic data. As a cutting-edge technology developed in the field of information security, digital watermarking technology plays an impor...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06F21/00G06F21/60
Inventor 任娜朱长青崔翰川曹曲
Owner CHANGSHU NANJING NORMAL UNIV DEV RES INST
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