Method for reconstructing alpha-shape curved surface topology of object surface sample point

A sample point and surface technology, applied in 3D modeling, image data processing, instruments, etc., can solve problems such as reduced reconstruction efficiency

Inactive Publication Date: 2015-08-05
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to α -The main problem of the shape algorithm is to propose a sample point on the surface of the object

Method used

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  • Method for reconstructing alpha-shape curved surface topology of object surface sample point
  • Method for reconstructing alpha-shape curved surface topology of object surface sample point
  • Method for reconstructing alpha-shape curved surface topology of object surface sample point

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Embodiment 1

[0046] Embodiment one: to Figure 15 The sample points on the surface of the mechanical parts shown in , are reconstructed using the surface topology reconstruction method described in the present invention. Figure 15 The sample point set shown contains 55685 sample points, including edge features, boundary features and free-form surfaces, and is a point set with a large degree of overall non-uniform distribution. The reconstruction method of the present invention optimizes the gain of the local samples of the curved surface. The distribution information of sample points in the sparse area of ​​sampling data is obtained more fully, which can make α -The adjustment of the shape scale threshold is more accurate, avoiding the overestimation of the sample point density due to the serious deviation of the local samples of the surface from the sampling data-intensive area, which can effectively reduce the defects caused by mistaken deletion. From Figure 16 From the reconstructio...

Embodiment 2

[0047] Embodiment two: to Figure 17 The sample points on the surface of the real object shown in - the Rabbit point cloud model are reconstructed by using the surface topology reconstruction method described in the present invention. Figure 17 The point cloud model shown contains 34,834 samples, the overall distribution is approximately uniform, and the local area is non-uniform due to large curvature changes, and there are sharp edges on the edge of the ear, because this paper can obtain a better local surface in the case of non-uniformity samples are used in the surface topology reconstruction process, so Figure 18 The overall reconstruction results and the reconstruction effect of the ear edge are good. The number of patches in the reconstructed mesh model is 100163, and the reconstruction time is 11.82 seconds.

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Abstract

The invention provides a method for reconstructing alpha-shape curved surface topology of an object surface sample point, which belongs to the field of product reverse engineering. The method is characterized by comprising the steps of constructing a Delaunay grid partition of the object surface sample point and constructing a space index KD tree; solving an alpha-shape scale threshold interval which corresponds with each patch, and obtaining a left end point set and a right end point set of the interval; selecting a patch with a least end point summation of the interval as an initial patch; obtaining a curved surface local sample with an optimized gain for estimating a sample point distribution density, performing alpha-shape scale threshold adaptive adjustment according to the sample point distribution density, then performing Delaunay patch filtering, and obtaining an initial grid curved surface; and extracting an external grid patch of the initial grid for obtaining a two-dimensional manifold grid. The method of the invention has functions of substantially preventing holes and rib dents on the grid curved surface, better keeping shape and position accuracy of the rib characteristic, reducing non-manifold patches in a primary filtering result, and furthermore realizing a relatively high reconstruction efficiency.

Description

technical field [0001] The present invention provides physical surface sample points α -shape surface topology reconstruction method, which can be used to construct a mesh surface model of sample points on the surface of an object, and belongs to the field of product reverse engineering. Background technique [0002] Surface topology reconstruction, also known as surface reconstruction, is the core technology of reverse engineering. It mainly solves the problem of restoring the adjacency relationship of physical surface samples that only contain coordinate information and are scattered. . The shape and location accuracy of the reconstruction results of the edge features of the sample points on the physical surface have an important impact on the subsequent design analysis and remanufacturing process. However, the current surface topology reconstruction technology cannot realize the accurate reconstruction of the edge features, and the data volume exceeds the physical memory...

Claims

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Application Information

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IPC IPC(8): G06T17/30
Inventor 孙殿柱魏亮李延瑞薄志成
Owner SHANDONG UNIV OF TECH
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