Three-dimensional grid model digital watermarking method based on spherical parameterization

A 3D grid and digital watermarking technology, applied in 3D modeling, image data processing, image data processing, etc., can solve problems such as grid deformation

Inactive Publication Date: 2010-09-15
HANGZHOU DIANZI UNIV
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Problems solved by technology

This method also solves the problem of grid deformation caused by sampling and embedding watermarks, and in the process of extracting watermarks, the information of grid watermarks is enlarged and the special coding strategy for watermarks is beneficial to the extraction of watermarks

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  • Three-dimensional grid model digital watermarking method based on spherical parameterization
  • Three-dimensional grid model digital watermarking method based on spherical parameterization
  • Three-dimensional grid model digital watermarking method based on spherical parameterization

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Embodiment Construction

[0059] The specific steps of the three-dimensional mesh model digital watermarking method based on spherical parameterization are:

[0060] Step (1) reordering the original grid X-coordinates to make it a grid with new X-coordinates obtained from small to large ascending arrangement;

[0061] Step (2) Use the spherical parameterization method to transform the geometric position (ie vertex coordinates) signal F on the original grid M t Transformed into a signal F on a spherical parametric grid t s (θ, φ), t=1, 2, 3, t represents the three coordinate directions; θ (π≤θ≤0) represents the longitude angle on the spherical surface, and φ (2π≥φ≥0) represents the latitude angle on the spherical surface .

[0062] The above-mentioned spherical parameterization method adopts the existing mature method, and the principle is as follows:

[0063] The spherical surface parameterization method uses the unit spherical surface to replace the complex mesh surface as the definition domain of...

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Abstract

The invention relates to a three-dimensional grid model digital watermarking method based on spherical parameterization. The existing digital watermarking technology mainly aims at the media data patterns such as still pictures, video streams and audio streams and the research works on the watermarking technology of three-dimensional geometric model data are less. The method of the invention comprises the following steps: utilizing the method of grid global spherical parameterization to obtain spherical harmonic and analytical coefficient of the grid, embedding a watermark in the harmonic and analytical coefficient, and then perform the corresponding inverse transformation to obtain the grid embedded with the watermark. The method also solves the grid deformation problem caused by sampling and watermark-embedding, and the amplification of the grid watermark information in watermark-extracting process and the specific coding strategy of the watermark are beneficial to the extraction of the watermark. The method for extracting the watermark does not require the original grid and pretreatment, and can resist various attacks such as noise-adding, smoothness, enhancement, rotation, translation, scaling, resampling, clipping and some combined attacks.

Description

technical field [0001] The invention relates to a three-dimensional grid model digital watermarking method based on spherical surface parameterization. Background technique [0002] Most of the current digital watermarking technologies are aimed at media data types such as still images, video streams and audio streams, but there are relatively few researches on watermarking technology for 3D geometric model data. With the development of 3D scanning technology, 3D geometric models have become a new media type after audio, image and video, and are widely used in the entertainment industry, manufacturing industry and other fields. [0003] Due to the characteristics of the 3D model data itself, the traditional image watermarking method cannot be simply applied to the 3D geometric model. There are some difficulties in the 3D model watermarking. For example, due to the irregularity of the 3D geometric model data, there is a lack of Some naturally parametric way of doing frequenc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06T17/20
Inventor 李黎
Owner HANGZHOU DIANZI UNIV
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