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Three-dimensional-grid dual-watermark method based on grouping strategy and neighborhood relationship positioning

A grouping strategy and three-dimensional grid technology, applied in image data processing, instruments, image data processing, etc., can solve problems such as robust watermark and fragile watermark interference

Active Publication Date: 2018-08-31
HANGZHOU DIANZI UNIV
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Problems solved by technology

[0006] The three-dimensional grid model watermarking method of the present invention embeds robust watermarks and fragile watermarks in the three-dimensional grid model at the same time, and uses a dual-objective optimization model to perform dual watermark coupling processing to solve the problem of mutual interference between robust watermarks and fragile watermarks, achieving Dual Effects of Copyright Protection and Content Authentication

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  • Three-dimensional-grid dual-watermark method based on grouping strategy and neighborhood relationship positioning
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  • Three-dimensional-grid dual-watermark method based on grouping strategy and neighborhood relationship positioning

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Embodiment Construction

[0028] The present invention will be further described below with reference to the drawings and embodiments.

[0029] Such as Figure 1-6 As shown, the three-dimensional grid double watermarking method based on grouping strategy and domain relationship positioning, the specific steps are as follows:

[0030] Step (1) Group the vertices of the 3D model:

[0031] Convert the 3D model from the Cartesian coordinate system to the spherical coordinate system, and use the distance from the model vertex to the model center to group the vertices. According to the length of the embedded watermark, each vertex falls into the corresponding group.

[0032] Let (x i ,y i ,z i ) Represents the Cartesian coordinates of the i-th vertex of a three-dimensional model with N vertices. Calculate the center of the 3D model (x c ,y c ,z c ), using principal component analysis to get the principal axis v. Set the origin of the spherical coordinate system In the passing center (x c ,y c ,z c ) On a straight...

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Abstract

The invention discloses a three-dimensional-grid dual-watermark method based on a grouping strategy and neighborhood relationship positioning. In the invention, through firstly embedding a robust watermark and then embedding a fragile watermark, copyright protection and content authentication are performed on a three-dimensional model. For the robust watermark, the distribution characteristic of three-dimensional model vertexes is used to group the vertexes so as to embed watermark information. For the fragile watermark, the watermark is embedded by adjusting the geometrical relationship between model vertexes and a ring neighborhood. In the method, a dual-target optimization model is used to carry out dual-watermark coupling processing so as to solve the problem of mutual interference between the robust watermark and the fragile watermark. By using the method, the watermark is extracted without an original grid, and the robust watermark and the fragile watermark are not mutually interfered. And simultaneously, the robust watermark can resist common attacks and the attacks comprise geometric transformation, a noise, vertex reordering, simplification, and subdivision. The fragile watermark has a tamper positioning function.

Description

Technical field [0001] The invention relates to a three-dimensional grid double watermarking method based on grouping strategy and domain relationship positioning. Background technique [0002] Digital watermarking technology is a widely recognized and effective copyright protection strategy. After years of development, digital watermarking technology has become quite mature and can be applied to various scenarios. The basic principle of digital watermarking is to use the redundant information of data to embed watermark information in the original carrier data (such as audio, video, image, three-dimensional model, etc.). The watermark information can be meaningful copyright information, such as pictures, company trademarks, and author names, etc.; it can also be meaningless information, such as randomly generated strings or numbers. The watermark information is hidden in the carrier data and will not destroy the visual effect of the original carrier. It is more difficult to cr...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/0042G06T1/0071G06T2201/0601
Inventor 李黎陆剑锋袁文强张善卿
Owner HANGZHOU DIANZI UNIV
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