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A dual-normal mesh model fairing method based on vertex characteristics

A mesh model and vertex technology, which is applied in the field of smoothing of two-normal mesh models based on vertex features, and can solve problems such as vertex offset, blurred mesh detail features, and shape distortion.

Active Publication Date: 2019-01-18
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when smoothing a non-uniform, multi-scale mesh model, only guiding the vertex position update based on the geometric information of the surface normal will lead to problems such as fuzzy mesh details, shape distortion, or vertex offset.

Method used

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  • A dual-normal mesh model fairing method based on vertex characteristics
  • A dual-normal mesh model fairing method based on vertex characteristics
  • A dual-normal mesh model fairing method based on vertex characteristics

Examples

Experimental program
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Effect test

Embodiment 1

[0153] A method for smoothing a double-normal mesh model based on vertex features, mainly comprising the following steps:

[0154] 1) Using tensor voting theory, divide all vertices in the grid model into feature points and non-feature points.

[0155] Further, the main steps of dividing the vertices of all triangular patches in the triangular mesh model into feature points and non-feature points are as follows:

[0156] 1.1) Calculate the normal tensors of all the vertices of the triangular patches in the triangular mesh model.

[0157] The jth triangle facet f of the triangular mesh model j vertex v i tensor of is the neighborhood triangle normal covariance matrix weight and .

[0158] vertex v i The normal tensor of As follows:

[0159]

[0160] In the formula, N f (v i ) is the vertex v i The first-order neighborhood triangle of . is the weight. f j is the jth triangular patch of the triangular mesh model. is the triangular facet f j The unit normal...

Embodiment 2

[0298] A smoothing experiment of a dual-normal mesh model based on vertex features, mainly including the following experiments:

[0299] 1) Determine that the grid model is the Fandisk noise-adding model, such as figure 1 shown. Using bilateral filtering algorithm, bilateral normal filtering method, optimization-based double normal filtering, joint bilateral filtering and the method of the present invention to compare respectively, as Figures 2 to 6 shown.

[0300] II) Determine that the grid model is a support noise model, such as Figure 7 shown. Using bilateral filtering algorithm, bilateral normal filtering method, optimization-based double normal filtering, joint bilateral filtering and the method of the present invention to compare respectively, as Figures 8 to 12 shown.

[0301] III) Determine the grid model as the cylinder head model, such as Figure 13 shown. Using Laplace method, bilateral filtering algorithm, bilateral normal filtering method, joint bilater...

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Abstract

The invention discloses a dual-normal mesh model fairing method based on vertex characteristics, which mainly comprises the following steps: 1) all vertices in the mesh model are divided into characteristic points and non- characteristic points. 2) the surface normal field is constructed by using guide filter. 3) The accurate surface normal field can be obtained by filtering the normal field of the surface opposite to each surface. 4) Computing the normal directions of the vertices of the characteristic points and the non-characteristic points in the triangular mesh model respectively, so as to construct the normal fields of the vertices. 5) updating the position of the non-characteristic vertices according to the surface normal direction; The characteristic vertex positions are updated iteratively according to the surface normal and vertex normal. 6) smoothing that mesh model. The invention can better retain the detail characteristic of the mesh model while removing the noise of the mesh model, and the error of the mesh model after smoothing is small, and the mesh model can more accurately approach the actual model.

Description

technical field [0001] The invention relates to the field of data acquisition and reconstruction, in particular to a method for smoothing a double-normal grid model based on vertex features. Background technique [0002] Because industrial CT data is affected by factors such as equipment, ray source noise, reconstruction algorithms, and human factors during data acquisition, storage, and transmission, it is inevitable to contain some noise information in the reconstruction of triangular mesh models based on industrial CT data. The existence of these noises not only reduces the visualization effect of the mesh model, but also brings troubles to the subsequent processing work. Although many methods have achieved satisfactory smoothing results, it is still a challenging task to effectively preserve the geometric and detailed features of the mesh model while smoothing the non-uniform sampling and multi-scale triangular mesh models. . [0003] The existing mesh fairing methods ...

Claims

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Application Information

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IPC IPC(8): G06T17/20
CPCG06T17/20
Inventor 段黎明王武礼
Owner CHONGQING UNIV
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