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Volumetric mesh deformation method

A volume grid and algorithm technology, applied in image data processing, 3D modeling, instruments, etc., can solve problems such as unfavorable popularization and application, difficult real-time interaction, and complex finite element method principles, etc., to achieve easy implementation, easy operation, and effective The effect of promotion

Inactive Publication Date: 2011-11-09
HANGZHOU PUREINFO INFORMATION TECH
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Problems solved by technology

However, the computational complexity of the finite element method is relatively large, and it is difficult to perform real-time interaction. At the same time, the principle of the finite element method is relatively complicated, and it is not easy to achieve a robust numerical implementation.
In addition, the operation and interaction of these general-purpose 3D simulation systems are relatively complicated, which is not conducive to popularization and application.

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Embodiment Construction

[0020] The present invention extends the deformation method based on Laplace coordinates on the surface grid to the volume grid, and the steps are as follows:

[0021] 1. Represent the input tetrahedral mesh as a two-tuple ,in is a point set in three-dimensional Euclidean space; is an abstract simplicial complex that describes all the adjacency information of the mesh, including the vertex set , edge subset , Mianziji , and the tetrahedral subset . Apply the Laplacian operator on the volume mesh to each mesh vertex to define the volume mesh Laplacian coordinates:

[0022] . (1)

[0023] 2. The weight of the body grid Laplacian operator weighted by material ,in It is the material parameter of each tetrahedral unit, which can be used to set the influence of non-uniform material properties inside the physical entity on deformation; for the side on the opposite side side length, for the opposite side of dihedral angles.

[0024] Using the globa...

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Abstract

The invention discloses a volumetric mesh deformation method. The method is used for the interactive design of a simulation system for a hump nose plastic surgery; in the system, the Laplace coordinate-based deformation method on surface meshes is popularized to the volumetric meshes, and a high-quality volumetric mesh deformation effect is achieved in a simple and convenient interactive operation mode, so that the geometric detail characteristic and model volume are kept invariant as much as possible; meanwhile, the influence of non-uniform material parameters on deformation is considered fully to achieve a similar effect of physical deformation. In the simulation system for the hump nose plastic surgery, the original input data is computed tomography (CT) scanning volumetric data of patients and is imported into an image segmentation module and a three-dimensional model reconstruction module.

Description

technical field [0001] The invention relates to a method for parametrizing a virtual three-dimensional human body model and changing the shape of the three-dimensional human body model through parameter adjustment, that is, a body grid deformation method in which the parameters drive the deformation of human bones and soft tissues. Background technique [0002] For the simulation of rhinoplasty surgery, the most commonly used method is to use a simulation system based on image deformation technology, such as the AlterImage Cosmetic Surgery Simulation system in the United States. This type of system inputs a patient's profile portrait photo, and then performs local reconstruction on the nose area of ​​the image. Stretching and twisting. However, the two-dimensional image simulation obviously lacks three-dimensional depth information, and cannot be rotated to view the shape of any viewing angle. At the same time, it is of little significance for surgical guidance. [0003] To ...

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Application Information

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IPC IPC(8): G06T17/30
Inventor 黄琦廖胜辉
Owner HANGZHOU PUREINFO INFORMATION TECH
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