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A Geospatial Data Watermarking Method Based on Byte Stream

A geospatial data and byte stream technology, applied in image data processing, image data processing, instruments, etc., can solve the problem of geospatial data use authority control flow tracking and other issues

Active Publication Date: 2017-12-01
常熟紫金知识产权服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It better solves the problems of access control and flow tracking of geospatial data in the process of circulation

Method used

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  • A Geospatial Data Watermarking Method Based on Byte Stream
  • A Geospatial Data Watermarking Method Based on Byte Stream
  • A Geospatial Data Watermarking Method Based on Byte Stream

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In the embodiment of the present invention, the digital raster map is selected as the experimental data, and the whole process of data reading, preprocessing, watermark information generation, watermark embedding, watermark data storage, watermark detection, detection result output, and watermark removal is given. An embodiment of the present invention is presented, and the present invention is further described in detail.

[0052] Such as image 3 and Figure 4 As shown, in this embodiment, a digital grid map with a size of 698×654 is selected as the experimental data. For this piece of data, the mapping step size N is set to 8.

[0053] 1. The watermark information generation of the present invention:

[0054] Step 1: Generate a random number, which is unique and forms a one-to-one relationship with each user;

[0055] Step 2: Based on the random number, use the random sequence generator to generate a pseudo-random binary sequence, and convert the pseudo-random bi...

Embodiment 2

[0088] Such as figure 1 and figure 2 As shown, the purpose of the present invention is: the solutions proposed by the current watermarking technology research institute are all based on the traditional digital watermarking idea, which is a passive data copyright management and usage tracking mechanism, and cannot control the geospatial data in the circulation process. The use of permissions cannot achieve the purpose of actively controlling users' access to correct geospatial data, and does not take into account the diversity of geospatial data sources, and the complexity of watermark embedding methods for different feature data. Aiming at this problem, a new type of geospatial data watermarking method based on byte stream is invented. This watermarking method has better robustness, and can effectively reduce the availability of geospatial data, and better solve the problem of geospatial data. Issues such as access control and flow tracking in the circulation process.

[00...

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Abstract

The invention relates to a geographic space data watermarking method based on byte streams. The geographic space data watermarking method is based on the characteristic that geographic space data are organized with the byte streams as units in the computer carrier access and circulation processes, the data encryption thought is introduced into the design of the watermarking algorithm, the mathematic mapping thought is adopted, a watermarking mapping function is built, namely the function for locating watermarking information bits according to bytes is built, a several-for-one mapping relation is kept between the bytes and the watermarking information bits, the embedded positions of the watermarking information bits are determined through the built mapping relation, and then watermarking information is embedded into the data bytes in a quantized mode. When watermarking detection is carried out, the optimal watermarking information is restored according to the maximum membership degree principle. According to the geographic space data watermarking method based on the byte streams, the quality and the accuracy of the geographic space data can be effectively controlled, the availability of the geographic space data is reduced, the copyright of the geographic space data in the circulation process can be effectively protected, and the function of tracing a data outflow source is achieved.

Description

technical field [0001] The invention relates to the technical field of geographic information copyright protection, in particular to a byte stream-based geospatial data watermarking method. Background technique [0002] Geospatial data is an indispensable strategic resource in national economy and national defense construction, and a supporting achievement of national infrastructure construction and earth science research. In recent years, as the process of digitization and networking of geospatial data has been accelerated, its dissemination and circulation in different places have become more and more convenient, which has also led to increasingly serious phenomena such as illegal use of geospatial data and copyright disputes. Therefore, how to effectively manage the use rights of geospatial data in the circulation process, protect its copyright and even track its use has become an important issue that needs to be solved urgently in the current geospatial information secur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 朱长青符浩军曹曲
Owner 常熟紫金知识产权服务有限公司