Skeleton line extraction method based on projection matching group

A technology of projection matching and extraction method, which is applied in the field of computer vision, can solve the problems of long time consumption, poor positioning effect, poor universality, etc., and achieve the effect of improving the effect and time-consuming, removing the influence of noise, and strong universality

Active Publication Date: 2019-09-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

[0007] In order to overcome the technical problems such as poor positioning effect, long time consumption and poor universality of the existing technology, the present invention provides a skeleton line extraction method based on projection matching group

Method used

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  • Skeleton line extraction method based on projection matching group
  • Skeleton line extraction method based on projection matching group
  • Skeleton line extraction method based on projection matching group

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] This example proposes a skeleton line extraction method based on projection matching group, using grid projection technology to map the tooth point cloud to a two-dimensional plane, and then using morphological operations to denoise to obtain tooth structure, and then using coordinate matching group technology to obtain three-dimensional teeth Skeleton lines, such as figure 1 shown.

[0060]The method of this embodiment specifically includes the following steps:

[0061] 1. Tooth point cloud grid projection

[0062] Since a jaw point cloud has tens of thousands of three-dimensional points, for the convenience of description, this embodiment only deduces a local point cloud Q of the whole. The point cloud Q consists of four points, namely:

[0063] A=(x 1 ,y 1 ,z 1 ), B=(x 2 ,y 2 ,z 2 ), C=(x 3 ,y 3 ,z 3 ), D=(x 4 ,y 4 ,z 4 ). In order to obtain the two-dimensional skeleton line, the plane where the two-dimensional skeleton line is located is the O-XY pla...

Embodiment 2

[0114] Based on the 3D skeleton line extraction method based on the projection matching group proposed in the above-mentioned embodiment 1, the method of this embodiment also includes based on the extracted 3D skeleton line, using the spatial position of the overlapping area and the skeleton line, and using the normal distance as a criterion from The overlapping regions are classified in the gingiva point cloud, as follows:

[0115] The main function of the extracted skeleton line is that since the skeleton line is in the center of the tooth point cloud, it can be used as a dividing line to distinguish the buccal gingiva and lingual gingiva by using the positive and negative normal distances, as well as the buccal gingiva line and lingual side gum line, and the buccal gum line is the anterior arch, and the buccal gum is the overlap area.

[0116] The specific process of extracting the anterior dental arch using the skeleton line is as follows:

[0117] Let the extracted skele...

Embodiment 3

[0124]In this embodiment, the skeleton line extraction algorithm based on projection matching group in the above-mentioned embodiment 1 is compared with the existing iterative refinement algorithm based on Laplacian operator; the experimental results given in this embodiment are all based on the Matlab experimental environment, It runs on a PC with CPUIntel(R)Core(TM)i3-6100@3.70GHz and 8G memory, and the operating system is Windows 64-bit operating system. For the same jaw point cloud, under different sampling conditions, the number of different point clouds and the number of triangle meshes (jaw 1: vertices: 19601, faces: 38084; jaw 2: vertices: 13865, faces: 26277; jaw 3: Vertices: 10557x3, faces: 19816x3; Jaw 4: vertices: 5945, faces: 10719; Jaw 5: vertices: 1532, faces: 2698; ) to compare the effect of the algorithm. Analyze the effect of skeleton line extraction and the time-consuming algorithm under different numbers of point clouds and triangular meshes. Take jaw 1 as...

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Abstract

The invention discloses a skeleton line extraction method based on a projection matching group, which comprises the following steps: mapping tooth point cloud to a two-dimensional plane by utilizing a grid projection technology, denoising by utilizing morphological operation to obtain a tooth structure, and then obtaining a three-dimensional tooth skeleton line by utilizing a coordinate matching group technology; compared with a traditional method, the skeleton line extraction method provided by the invention has the advantages that the effect and the consumed time are obviously improved, and the accuracy and the reliability of overlapping region positioning are greatly improved.

Description

technical field [0001] The invention relates to the technical field of computer vision, in particular to a method for extracting skeleton lines based on projection matching groups. Background technique [0002] Skeleton - the central axis of the target graphic image, that is, a set of all center point elements (skeleton subsets), which can effectively reflect the connectivity of the shape of the object in the graphic image and the topology of the geometric shape of the graphic image. In computer vision technology play a pivotal role. [0003] In the medical field, skeleton extraction technology is even more important. Extracting the target skeleton from medical images obtained from various medical equipment is one of the most basic tasks in medical image processing. Many scholars at home and abroad have already carried out long-term research and achieved certain results. [0004] With the continuous advancement of technology, 3D lidar has reached sub-millimeter resolution,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/00
CPCG06T3/0037
Inventor 李小兵罗嘉庆潘毅
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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