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Three-dimensional grid digital blind watermark method based on Octree encode

A three-dimensional grid and blind watermarking technology, which is applied in image coding, image data processing, image data processing, etc., can solve the problems of small embedding capacity, noise superposition and re-grid not robust, and blind watermarking with poor robustness and other problems, to achieve the effect of large embedding capacity, strong practicability, and good robustness

Inactive Publication Date: 2008-05-14
BEIHANG UNIV
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Problems solved by technology

[0006] To sum up, most of the current 3D model digital watermarks have the following disadvantages: (1) the embedding capacity is relatively small; (2) most of them are non-blind digital watermarks; (3) the robustness of blind watermarks is poor, Not robust against complex attacks such as simplification, noise superposition, and remeshing

Method used

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  • Three-dimensional grid digital blind watermark method based on Octree encode
  • Three-dimensional grid digital blind watermark method based on Octree encode

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Embodiment Construction

[0017] The watermark embedding flow chart of the present invention is as shown in Figure 1, and concrete steps are as follows:

[0018] (1) Principal component analysis (PCA) axial preprocessing

[0019] Octree subdivision is invariant to translation and uniform scaling, but model rotation will change the result of Octree subdivision. In order to extract the watermark information after a malicious attacker performs a rotation attack on the model, automatic adjustment of the model pose is necessary. When embedding and extracting watermark information, the model must be preprocessed by PCA axially. The model is first moved to the origin of the coordinate system, and then the principal component eigenvectors are calculated. After translation, the covariance matrix C of the model vertex coordinates can be obtained 0 Through the three eigenvalues ​​λ of the matrix C 1 ,λ 2 ,λ 3 By sorting from large to small, three mutually orthogonal eigenvectors β can be obtained 1 , β 2 ...

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Abstract

The invention relates to a three-dimension grid number blind watermarking method based on an Octree code, comprising the steps as follows: pretreating a model through principal component analysis to gain a unique gesture direction of the model; carrying out Octree subdivision for the three-dimension model to acquire Octree structure and code data; selecting the code of a specific Octree level and node to be embedded with significant and tremendous watermarking information. The invention does not need the original model data when extracting the watermark and the arithmetic is irrelative to the model topology, allowing watermark inlay of point cloud data. Furthermore, the invention is characterized by large inlay quantity, good resistance against rotation, horizontal movement, zoom and top point reorder attack. According to zero watermark constructed with the Octree high-layer code, the invention having high robustness and university is capable of resisting even simplification, noise and attack from secondary gridding, etc., to some extent.

Description

technical field [0001] The invention belongs to the technical fields of computer virtual reality and computer graphics, and specifically relates to a method for embedding and extracting watermarks by using 3D model Octree coding, which is used for copyright protection of 3D digital works. Background technique [0002] With the development and diversification of data storage and publishing technology, more and more digital works are applied to various fields, and digital watermarking technology has become one of the main means of copyright protection. In the digital watermarking technology, the digital watermarking technology of audio, video and image has become mature, but the 3D model watermarking technology started relatively late, and there is still a long way to go before its practical application. [0003] Since the grid representation of 3D models is the most common, most of the current 3D model watermarks are 3D grid watermarks. According to whether the original mode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06T9/40G06T17/00
Inventor 齐越沈旭昆舒军
Owner BEIHANG UNIV
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