Lossless watermark method based on organization characters of vector geographic line data

A technology of vector geographic and line data, which is applied in the field of lossless watermarking based on the organizational characteristics of vector geographic line data, and can solve problems such as no lossless algorithm

Active Publication Date: 2017-05-31
NANJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] But compared to the traditional "embedded" watermark, the "constructive" zero watermark is not a real watermark
Since the zero watermark is constructed, anyone can construct the zero watermark based on the original data, and the ownership of the data copy

Method used

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  • Lossless watermark method based on organization characters of vector geographic line data
  • Lossless watermark method based on organization characters of vector geographic line data
  • Lossless watermark method based on organization characters of vector geographic line data

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Embodiment 1

[0050] Embodiment 1: as image 3 As shown, the vector geographic line data in the present embodiment includes the vector geographic line data of 1930 line elements, and the specific steps are as follows:

[0051] 1. Watermark information generation

[0052] Step 1: Generate a string of binary sequences, and establish a mapping table with the copyright information to be embedded;

[0053] Step 2: scrambling and encrypting the binary sequence;

[0054] 2. Watermark information embedding

[0055] Step 1: Extract the organizational features of the vector geographic line data;

[0056] Step 2: Compare the generated watermark information with the organizational features, and modify the corresponding organizational features to obtain the vector geographic line data embedded in the watermark;

[0057] 3. Watermark information detection

[0058] Step 1: Extract the organizational features of the vector geographic line data embedded in the watermark;

[0059] Step 2: Extract the w...

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Abstract

The invention discloses a lossless watermark method based on organization characters of vector geographic line data. The lossless watermark method comprises the following steps: watermark information generation, watermark information embedding and watermark information detecting. The organization characters of the vector geographic line data are utilized fully, and are combined with a robustness watermark technology, so that embedding and detecting of watermarks can be realized under the condition that data precision is not changed. Because watermark information is embedded in invariant of the vector geographic line data, the lossless watermark method can resist attack of almost all common types.

Description

technical field [0001] The invention belongs to geographic information security technology, in particular to a lossless watermarking method based on vector geographic line data organization features. Background technique [0002] With the increasing prosperity of surveying and mapping, digital geospatial data products play an important role in various fields of national economy and national construction. While digital geospatial data products are convenient to use, they also bring information security issues such as infringement and leakage. Among them, vector geographic data is widely used because of its high precision, small size, and easy transmission. How to effectively protect its copyright has become an urgent problem to be solved. [0003] "Digital Watermark Technology and Application" (Sun Shenghe et al. Beijing: Science Press, 2004) pointed out that digital watermark technology is a cutting-edge technology developed in the field of information security in recent ye...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/0064G06T2201/0203
Inventor 任娜周齐飞朱长青景旻
Owner NANJING NORMAL UNIVERSITY
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