Three-dimensional mesh blind watermarking method based on angle modulation
A technology of three-dimensional grid and angle modulation, which is used in instruments, computing, image data processing, etc., can solve the problems of relocation and transition-dependent topology structure in the extraction process, so as to enhance robustness, improve robustness, and improve performance effect
Active Publication Date: 2021-11-16
XIAN UNIV OF TECH
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[0004] The purpose of the present invention is to provide a three-dimensional grid blind watermarking method based on angle modulation, which solves the problems in the prior art that the transition depends on the topology and the extraction process needs to be relocated
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[0084] In this embodiment, four three-dimensional grid models are selected. like 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 repres...
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The invention discloses a three-dimensional grid blind watermarking algorithm based on angle modulation, specifically: calculate the average curvature of all vertices of the three-dimensional grid model, and the points with the average curvature less than 0 are placed in the feature point set as feature points, and the remaining The vertices of the vertices are used as reference points to belong to the reference point set, and all points in the reference point set are used to establish an invariant space; then the coordinates of the vertices are converted to spherical coordinates by Cartesian coordinates; according to the total bits of the binary watermark information sequence to be embedded Number N, divide the 3D mesh model into N regions; embed watermark information at each feature point of each region, and adjust the angle of feature points in each region according to the embedded watermark information; after embedding the watermark, The spherical coordinates are reversed into rectangular coordinates to obtain the 3D mesh model embedded with the watermark, and then the watermark information is extracted. The invention solves the problems in the prior art that the transition depends on the topological structure and that the extraction process needs to be relocated.
Description
technical field [0001] The invention belongs to the technical field of three-dimensional grid watermarking methods, in particular to a three-dimensional grid blind watermarking method 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] Three-dimensional mesh watermarking methods can be divided into two categories according to the embedding position of the watermark: spatial domain methods and frequency domain methods, among which the spatial domain methods have been studied extensively and deeply. In the spatial watermarking method, 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 more st...
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IPC IPC(8): G06T1/00
CPCG06T1/0028
Inventor 刘晶杨亚杰马豆利
Owner XIAN UNIV OF TECH