Watermark method of vectorial geographical spatial data based on integral wavelet transforms

A vector geography and spatial data technology, applied in the field of cartography and geographic information science, can solve the problems of the lack of robustness and practicability of the watermarking algorithm of vector geospatial data itself, and achieve good imperceptible characteristics and strong robustness. , good stability

Inactive Publication Date: 2007-12-26
THE PLA INFORMATION ENG UNIV
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Problems solved by technology

However, in the current research, the consideration of the characteristics of the vector geospatial data itself, the robustness and practicality of the watermarking algorithm are still insufficient.

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  • Watermark method of vectorial geographical spatial data based on integral wavelet transforms
  • Watermark method of vectorial geographical spatial data based on integral wavelet transforms
  • Watermark method of vectorial geographical spatial data based on integral wavelet transforms

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Embodiment Construction

[0011] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0012] Given by Fig. 1, the method of the present invention is,

[0013] A. Read the vector geospatial data, that is, read the original vector geospatial data from the surveying and mapping database;

[0014] B. Watermark information encryption and generation, that is, the chaotic sequence generated by the chaotic system has very good pseudo-randomness and initial value sensitivity characteristics, and the Logistic chaotic mapping system is used to encrypt the watermark image.

[0015] The specific algorithm steps are as follows:

[0016] The first step is to read the original binary watermark information W of size M×N, and reduce the dimension into a one-dimensional sequence {x k}, k=1,..., M×N, K=M×N is the watermark length;

[0017] In the second step, use the Logistic chaotic mapping system to generate a random sequence...

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Abstract

A vector geographic space data watermarking-method based on integer wavelet transform includes fetching original vector geographic space data from mapping databank, enciphering watermark information with chaos sequence, carrying out integer wavelet transform on coordinate string of said geographic space data and embedding watermark information into low frequency coefficient of wavelet transform; picking up watermark information by comparing wavelet coefficient mutual relation of data string to be tested to original reference data string when watermark is required to be picked up.

Description

1. Technical field [0001] The invention relates to the fields of cartography and geographic information science, in particular to a watermarking method for vector geospatial data based on integer wavelet transform. 2. Background technology [0002] Geospatial data is the supporting achievement of national infrastructure construction and earth science research. It plays a very important role in national economy and national defense construction. Its security involves national security, scientific and technological cooperation and intellectual property rights. Currently, there is an urgent need for reliable technologies to secure geospatial data. [0003] Digital watermark technology is a cutting-edge technology of information security developed with the process of digitization. It embeds secret watermark information in source data, combines watermark and source data closely and hides it, and becomes an inseparable part of source data. This is used to identify copyright owner...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 朱长青杨成松闵连权许德合王奇胜
Owner THE PLA INFORMATION ENG UNIV
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