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Three-dimensional digital watermarking method and apparatus based on three-dimensional model depth projection

A technology of 3D model and digital watermarking, which is applied in the fields of image processing, pattern recognition and information security, and can solve problems such as embedding extraction complexity and robustness

Inactive Publication Date: 2011-09-14
WUHAN UNIV OF TECH
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Problems solved by technology

These characteristics of the 3D geometric model make the traditional image watermarking algorithm cannot be simply copied in the research of the 3D geometric mo

Method used

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  • Three-dimensional digital watermarking method and apparatus based on three-dimensional model depth projection
  • Three-dimensional digital watermarking method and apparatus based on three-dimensional model depth projection
  • Three-dimensional digital watermarking method and apparatus based on three-dimensional model depth projection

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[0098] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but the embodiments should not be understood as limiting the present invention.

[0099] The method used in the present invention is:

[0100] The first step: the best viewpoint selection of the model: use principal component analysis to do the best viewpoint analysis of the original 3D model. Set the three-dimensional mesh model described by the patch as: V={v i |v i ∈R 3 , 1≤i≤n}, where v i Is any vertex of model V, n is the number of vertices of the model. In order to reduce the impact of model subdivision or simplification on model registration, each vertex of the model v i Add an impact factor w i = X j = 1 k s ij S v . Among them, S V Is the total area of ​​all the faces of the model, s ij To have vertex v i The area of ​​the j-th face of, k is the simultaneous shared vertex v i The number of patches,...

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Abstract

The invention relates to a method and system for obtaining digital watermarking based on an intensity projection of a three-dimensional model, wherein the adopted method comprises the following steps of: firstly, selecting a best view of the model by applying a principal component analysis to the three-dimensional model; then, acquiring an intensity projection image of the three-dimensional model in the direction of the best view, performing a Fourier transformation to the intensity projection image, embedding information of watermarking into a domain of the Fourier transformation of the intensity projection image so as to receive a three-dimensional model containing the watermarking; and acquiring an initial three-dimensional model by a reverse operation. Compared with the prior three-dimensional digital watermarking method, because the invention selects the intensity projection image of the three-dimensional model as an embedding domain, the watermarking is prevented from being erased, on the premise that an attacker does not want to affect a visual appearance of the model. Meanwhile, an experimental result indicates that: because the Fourier transformation has rotational invariance, translation and other characteristics, the digital watermarking method has a more perfect robustness for simplification, translation, rotation, scale invariance and other operations, thereby achieving an aim of protecting a copyright.

Description

technical field [0001] The invention belongs to the fields of information security, graphic image processing and pattern recognition, and specifically relates to a method and a system for obtaining a three-dimensional digital watermark based on depth projection of a three-dimensional model. Background technique [0002] With the rapid development of computer networks, information security issues are very prominent. As a new information security technology, information hiding technology has been adopted in many application fields. At present, it is also attracting more and more attention from research institutions and business circles, and its main driving force comes from people's needs for copyright protection. With the digitization of audio-visual, image and other electronic products, the piracy of digital products is easier, which has attracted great attention from music, film, book and software publishers, thus triggering the development of "digital watermarking", an im...

Claims

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Application Information

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IPC IPC(8): G06T17/00G06T1/00
Inventor 周祖德刘泉张小梅李方敏刘虹江雪梅
Owner WUHAN UNIV OF TECH
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