Three-dimensional geographic model digital watermarking method with copyright protection service orientation

A digital watermarking and copyright protection technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of poor file attack robustness and inability to resist model attacks, and achieve strong robustness and improve anti-attack ability. Effect

Active Publication Date: 2013-10-30
NANJING JIYIN INFORMATION TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to propose a digital watermarking method for 3D g

Method used

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  • Three-dimensional geographic model digital watermarking method with copyright protection service orientation
  • Three-dimensional geographic model digital watermarking method with copyright protection service orientation
  • Three-dimensional geographic model digital watermarking method with copyright protection service orientation

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Experimental program
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Embodiment 1

[0035] In this example, a school model geographical data is selected as the experimental data, and an embodiment of the present invention is given for the whole process of data reading, generation of watermark information, watermark embedding, watermark detection and detection result output, and the present invention is further described in detail .

[0036] Such as figure 2 , image 3 , Figure 4 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, in this embodiment, a school model geographic data generated by 3D MAX is selected as the experimental data, and the entire 3D geographic model data file includes 3D data (.3DS) and 2D texture mapping data (.JPG).

[0037] 1. Watermark information generation:

[0038] Step 1: Input watermark information: in this embodiment, it is: "Jiyin of Nanjing Normal University".

[0039] Step 2: Generate a random number seed point, which is "-1159586775" in this embodiment.

[0040] Step 3: Use the generated ran...

Embodiment 2

[0094] Such as figure 1 and Figure 5 As shown, the purpose of the present invention is to propose a digital watermarking method for 3D geographic model data, so that the entire 3D geographic model The attack has better robustness.

[0095] In order to realize the above-mentioned purpose of the invention, the technical scheme that the present invention takes is:

[0096] A three-dimensional geographic model digital watermarking method for copyright protection services, comprising the following steps:

[0097] (1) Watermark information generation

[0098] Use a pseudo-random number generator to generate a random number as the watermark seed point , and then take the seed point as the key, using linear random Sequence generator, generate watermark information sequence And create watermark information and the watermark seed point One-to-one reference table.

[0099] (2) 3D geographic model data watermark embedding scheme

[0100] Step 1: Sequentially select each ...

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Abstract

The invention discloses a three-dimensional geographic model digital watermark embedding and detection method, and belongs to the technical field of geographic information copyright protection. The method is based on that a texture coordinate value of three-dimensional geographic model data after an attack is changed without a variation in a data value of corresponding texture mapping. Thus, the method, on the basis of analysis of a previous watermark algorithm and by making full use of characteristics of texture mapping, re-establishes an embedding position of a watermark and builds a new digital watermarking model of the three-dimensional geographic model data. Not only is a three-dimensional grid data file of a three-dimensional geographic model embedded, but also a data file of the texture mapping is embedded with the watermark information. The problems are solved that a single geographic model algorithm is low in robustness for some attacks and that a current three-dimensional geographic model data file with texture mapping data cannot detect a watermark after a file attack and a model attack.

Description

technical field [0001] The invention relates to the technical field of geographic information copyright protection, in particular to a digital watermark embedding and detection method for three-dimensional geographic model data. Background technique [0002] In the field of GIS, 3D geographic model has become an important part of GIS data representation and has brought considerable economic benefits. The three-dimensional geographic model has the advantages of intuition, image, precision, and completeness. In terms of surface object expression, it makes the spatial three-dimensional structure display of objects more intuitive; as an important part of digital city construction, the three-dimensional geographic model has been used in urban planning, wireless communication, Disaster management, cadastral management, tourism, transportation and environmental simulation have shown great potential. [0003] In recent years, with the rapid development of the digital and network er...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 朱长青刘海艳符浩军
Owner NANJING JIYIN INFORMATION TECH
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