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3D mesh blind watermarking algorithm based on angle modulation

A three-dimensional grid, angle modulation technology, applied in computing, image data processing, instruments, etc., can solve the problems of transition-dependent topology structure, the need to relocate the extraction process, etc., to enhance robustness, improve performance, increase invisible sexual effect

Active Publication Date: 2018-09-14
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a three-dimensional mesh blind watermarking algorithm based on angle modulation, which solves the problems of transition dependence on topology and relocation in the extraction process existing in the prior art

Method used

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  • 3D mesh blind watermarking algorithm based on angle modulation
  • 3D mesh blind watermarking algorithm based on angle modulation
  • 3D mesh blind watermarking algorithm based on angle modulation

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Embodiment

[0084] In this embodiment, four three-dimensional grid models are selected. Such as Figure 3-10 Shown respectively is embodiment ant, horse, leopard, pig original model figure as experimental object, wherein, ant model is made up of 10206 vertices and 19680 faces; Horse model is made up of 32315 vertices and 66752 faces; Leopard model is made up of 20676 faces. Vertices and 40,258 faces; the pig model consists of 36,817 vertices and 62,589 faces, and a 32-bit watermark is used for embedding. The watermark embedding process is as follows:

[0085]Step 1.1, for the 3D mesh model, first calculate the average curvature of all vertices of the 3D mesh model, and divide the vertices into two sets according to the value of the average curvature: feature point set and reference point set.

[0086] In step 1.2, the coordinates of all vertices in the model are represented by the Cartesian coordinates of the newly established invariant space, and the coordinates of all points newly repr...

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Abstract

The invention discloses a 3D mesh blind watermarking algorithm based on angle modulation. The algorithm specifically comprises the steps as follows: the average curvature of all vertexes of a 3D meshmodel is calculated, points with the average curvature smaller than 0 placed in a feature point set as feature points, the rest vertexes are placed in a reference point set as reference points, and all points in the reference point set are used for establishing an invariant space; then, vertex coordinates are represented by rectangular coordinates, and the rectangular coordinates are converted into spherical coordinates; the 3D mesh model is divided into N areas according to the total bit N of a to-be-embedded binary water marking information sequence; watermarking information is embedded at each feature point of each area, and the angle of the feature point in each area is adjusted according to the embedded watermarking information; after watermarking is embedded, the spherical coordinates are reversely converted into rectangular coordinates, and the 3D mesh model with watermarking embedded is obtained, and watermarking information is extracted. The problems that topological structures are depended excessively and relocation is needed in the extraction process in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional grid watermarking algorithm, in particular to a three-dimensional grid blind watermarking algorithm based on angle modulation. Background technique [0002] With the development of 3D scanning technology and computer graphics and the improvement of computer performance, 3D model digital watermarking technology has successfully attracted people's attention, and the protection of model copyright has also received great attention. [0003] The three-dimensional grid watermarking algorithm is divided into two categories: air-domain algorithm and frequency-domain algorithm according to the watermark embedding position. Among them, the research on the air-domain algorithm is more extensive and in-depth. In the spatial watermarking algorithm, the geometric features available for the 3D model itself are relatively rich, and the means of analysis and processing are diversified, and more types of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/0028
Inventor 刘晶杨亚杰马豆利
Owner XIAN UNIV OF TECH